flake: move to nixos 24.05

experiments/src/main.rs

@@ -39,7 +39,7 @@ use libcortex_a9::{
 };
 use libregister::{RegisterR, RegisterW};
 use libsupport_zynq::{
-    boot, ram,
+    boot, exception_vectors, ram,
 };
 use log::{info, warn};
 use core::sync::atomic::{AtomicBool, Ordering};
@@ -96,6 +96,7 @@ pub fn restart_core1() {
 
 #[no_mangle]
 pub fn main_core0() {
+    exception_vectors::set_vector_table(0x0);
     // zynq::clocks::CpuClocks::enable_io(1_250_000_000);
     enable_l2_cache(0x8);
     println!("\nZynq experiments");

flake.lock

@@ -3,11 +3,11 @@
     "mozilla-overlay": {
       "flake": false,
       "locked": {
-        "lastModified": 1695805681,
+        "lastModified": 1704373101,
-        "narHash": "sha256-1ElPLD8eFfnuIk0G52HGGpRtQZ4QPCjChRlEOfkZ5ro=",
+        "narHash": "sha256-+gi59LRWRQmwROrmE1E2b3mtocwueCQqZ60CwLG+gbg=",
         "owner": "mozilla",
         "repo": "nixpkgs-mozilla",
-        "rev": "6eabade97bc28d707a8b9d82ad13ef143836736e",
+        "rev": "9b11a87c0cc54e308fa83aac5b4ee1816d5418a2",
         "type": "github"
       },
       "original": {
@@ -18,16 +18,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1701389149,
+        "lastModified": 1716542732,
-        "narHash": "sha256-rU1suTIEd5DGCaAXKW6yHoCfR1mnYjOXQFOaH7M23js=",
+        "narHash": "sha256-0Y9fRr0CUqWT4KgBITmaGwlnNIGMYuydu2L8iLTfHU4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5de0b32be6e85dc1a9404c75131316e4ffbc634c",
+        "rev": "d12251ef6e8e6a46e05689eeccd595bdbd3c9e60",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.11",
+        "ref": "nixos-24.05",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,12 +1,12 @@
 {
   description = "Bare-metal Rust on Zynq-7000";
 
-  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-23.11;
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-24.05;
   inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
 
   outputs = { self, nixpkgs, mozilla-overlay }:
     let
-      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) ]; };
+      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) crosspkgs-overlay ]; };
       
       rustManifest = pkgs.fetchurl {
         url = "https://static.rust-lang.org/dist/2021-01-29/channel-rust-nightly.toml";
@@ -26,118 +26,27 @@
         cargo = rust;
       });
       
-      gnu-platform = "arm-none-eabi";
+      # https://doc.rust-lang.org/rustc/linker-plugin-lto.html#toolchain-compatibility
+      llvmPackages_11 = pkgs.recurseIntoAttrs (pkgs.callPackage (import ./llvm/11) ({
+        inherit (pkgs.stdenvAdapters) overrideCC;
+        buildLlvmTools = null;
+        targetLlvmLibraries = null;
+        targetLlvm = null;
+      }));
 
-      binutils-pkg = { zlib, extraConfigureFlags ? [] }: pkgs.stdenv.mkDerivation rec {
+      crosspkgs-overlay = (self: super: {
-        basename = "binutils";
+        pkgsCross = super.pkgsCross // {
-        version = "2.30";
+          zynq-baremetal = import super.path {
-        name = "${basename}-${gnu-platform}-${version}";
+            system = "x86_64-linux";
-        src = pkgs.fetchurl {
+            crossSystem = {
-          url = "https://ftp.gnu.org/gnu/binutils/binutils-${version}.tar.bz2";
+              config = "arm-none-eabihf";
-          sha256 = "028cklfqaab24glva1ks2aqa1zxa6w6xmc8q34zs1sb7h22dxspg";
+              libc = "newlib";
+              gcc.cpu = "cortex-a9";
+              gcc.fpu = "vfpv3";
+            };
+          };
         };
-        configureFlags = [
+      });
-          "--enable-deterministic-archives"
-          "--target=${gnu-platform}"
-          "--with-cpu=cortex-a9"
-          "--with-fpu=vfpv3"
-          "--with-float=hard"
-          "--with-mode=thumb"
-        ] ++ extraConfigureFlags;
-        outputs = [ "out" "info" "man" ];
-        depsBuildBuild = [ pkgs.buildPackages.stdenv.cc ];
-        buildInputs = [ zlib ];
-        enableParallelBuilding = true;
-        meta = {
-          description = "Tools for manipulating binaries (linker, assembler, etc.)";
-          longDescription = ''
-            The GNU Binutils are a collection of binary tools.  The main
-            ones are `ld' (the GNU linker) and `as' (the GNU assembler).
-            They also include the BFD (Binary File Descriptor) library,
-            `gprof', `nm', `strip', etc.
-          '';
-          homepage = http://www.gnu.org/software/binutils/;
-          license = pkgs.lib.licenses.gpl3Plus;
-          /* Give binutils a lower priority than gcc-wrapper to prevent a
-            collision due to the ld/as wrappers/symlinks in the latter. */
-          priority = "10";
-        };
-      };
-
-      gcc-pkg = { gmp, mpfr, libmpc, platform-binutils, extraConfigureFlags ? [] }: pkgs.stdenv.mkDerivation rec {
-        basename = "gcc";
-        version = "9.1.0";
-        name = "${basename}-${gnu-platform}-${version}";
-        src = pkgs.fetchurl {
-          url = "https://ftp.gnu.org/gnu/gcc/gcc-${version}/gcc-${version}.tar.xz";
-          sha256 = "1817nc2bqdc251k0lpc51cimna7v68xjrnvqzvc50q3ax4s6i9kr";
-        };
-        preConfigure = ''
-          mkdir build
-          cd build
-        '';
-        configureScript = "../configure";
-        configureFlags = [ 
-          "--target=${gnu-platform}"
-          "--with-arch=armv7-a"
-          "--with-tune=cortex-a9"
-          "--with-fpu=vfpv3"
-          "--with-float=hard"
-          "--disable-libssp"
-          "--enable-languages=c"
-          "--with-as=${platform-binutils}/bin/${gnu-platform}-as"
-          "--with-ld=${platform-binutils}/bin/${gnu-platform}-ld" ] ++ extraConfigureFlags;
-        outputs = [ "out" "info" "man" ];
-        hardeningDisable = [ "format" "pie" ];
-        propagatedBuildInputs = [ gmp mpfr libmpc platform-binutils ];
-        enableParallelBuilding = true;
-        dontFixup = true;
-      };
-
-      newlib-pkg = { platform-binutils, platform-gcc }: pkgs.stdenv.mkDerivation rec {
-        pname = "newlib";
-        version = "3.1.0";
-        src = pkgs.fetchurl {
-          url = "ftp://sourceware.org/pub/newlib/newlib-${version}.tar.gz";
-          sha256 = "0ahh3n079zjp7d9wynggwrnrs27440aac04340chf1p9476a2kzv";
-        };
-        nativeBuildInputs = [ platform-binutils platform-gcc ];
-        configureFlags = [
-          "--target=${gnu-platform}"
-
-          "--with-cpu=cortex-a9"
-          "--with-fpu=vfpv3"
-          "--with-float=hard"
-          "--with-mode=thumb"
-          "--enable-interwork"
-          "--disable-multilib"
-
-          "--disable-newlib-supplied-syscalls"
-          "--with-gnu-ld"
-          "--with-gnu-as"
-          "--disable-newlib-io-float"
-          "--disable-werror"
-        ];
-        dontFixup = true;
-      };
-      gnutoolchain = rec {
-        binutils-bootstrap = pkgs.callPackage binutils-pkg { };
-        gcc-bootstrap = pkgs.callPackage gcc-pkg {
-          platform-binutils = binutils-bootstrap;
-          extraConfigureFlags = [ "--disable-libgcc" ];
-        };
-        newlib = pkgs.callPackage newlib-pkg {
-          platform-binutils = binutils-bootstrap;
-          platform-gcc = gcc-bootstrap;
-        };
-        binutils = pkgs.callPackage binutils-pkg {
-          extraConfigureFlags = [ "--with-lib-path=${newlib}/arm-none-eabi/lib" ];
-        };
-        gcc = pkgs.callPackage gcc-pkg {
-          platform-binutils = binutils;
-          extraConfigureFlags = [ "--enable-newlib" "--with-headers=${newlib}/arm-none-eabi/include" ];
-        };
-      };
 
       mkbootimage = pkgs.stdenv.mkDerivation {
         pname = "mkbootimage";
@@ -168,19 +77,20 @@
         src = pkgs.fetchFromGitHub {
           owner = "Xilinx";
           repo = "embeddedsw";
-          rev = "65c849ed46c88c67457e1fc742744f96db968ff1";
+          rev = "xilinx_v2022.2";
-          sha256 = "1rvl06ha40dzd6s9aa4sylmksh4xb9dqaxq462lffv1fdk342pda";
+          sha256 = "sha256-UDz9KK/Hw3qM1BAeKif30rE8Bi6C2uvuZlvyvtJCMfw=";
         };
-        patches = [ ./fsbl.patch ];
         nativeBuildInputs = [
-          pkgs.gnumake
+          pkgs.pkgsCross.zynq-baremetal.buildPackages.binutils
-          gnutoolchain.binutils
+          pkgs.pkgsCross.zynq-baremetal.buildPackages.gcc
-          gnutoolchain.gcc
         ];
         patchPhase = ''
-          patch -p1 -i ${./fsbl.patch}
           patchShebangs lib/sw_apps/zynq_fsbl/misc/copy_bsp.sh
-          echo 'SEARCH_DIR("${gnutoolchain.newlib}/arm-none-eabi/lib");' >> lib/sw_apps/zynq_fsbl/src/lscript.ld
+
+          for x in lib/sw_apps/zynq_fsbl/src/Makefile lib/sw_apps/zynq_fsbl/misc/copy_bsp.sh lib/bsp/standalone/src/arm/cortexa9/gcc/Makefile; do
+            substituteInPlace $x \
+              --replace "arm-none-eabi-" "arm-none-eabihf-"
+          done
         '';
         buildPhase = ''
           cd lib/sw_apps/zynq_fsbl/src
@@ -206,7 +116,7 @@
         ) ./.;
         cargoLock = { lockFile = ./Cargo.lock; };
 
-        nativeBuildInputs = [ cargo-xbuild pkgs.llvmPackages_14.clang-unwrapped ];
+        nativeBuildInputs = [ cargo-xbuild llvmPackages_11.clang-unwrapped ];
         buildPhase = ''
           export XARGO_RUST_SRC="${rust}/lib/rustlib/src/rust/library"
           export CARGO_HOME=$(mktemp -d cargo-home.XXX)
@@ -251,7 +161,7 @@
 
       hydraJobs = packages.x86_64-linux;
 
-      inherit rust rustPlatform;
+      inherit rust rustPlatform llvmPackages_11;
 
       devShell.x86_64-linux = pkgs.mkShell {
         name = "zynq-rs-dev-shell";
@@ -262,7 +172,7 @@
 
           pkgs.openocd pkgs.gdb
           pkgs.openssh pkgs.rsync
-          pkgs.llvmPackages_14.clang-unwrapped
+          llvmPackages_11.clang-unwrapped
           (pkgs.python3.withPackages(ps: [ ps.pyftdi ]))
         ];
       };

fsbl.patch

@@ -1,31 +0,0 @@
-diff --git a/lib/sw_apps/zynq_fsbl/src/Makefile b/lib/sw_apps/zynq_fsbl/src/Makefile
-index 0e3ccdf1c5..a5b02f386e 100644
---- a/lib/sw_apps/zynq_fsbl/src/Makefile
-+++ b/lib/sw_apps/zynq_fsbl/src/Makefile
-@@ -71,11 +71,14 @@ endif
- all: $(EXEC)
- 
- $(EXEC): $(LIBS) $(OBJS) $(INCLUDES)
--	cp $(BSP_DIR)/$(BOARD)/ps7_init.* .
- 	$(LINKER) $(LD1FLAGS)  -o $@ $(OBJS) $(LDFLAGS)
- 	rm -rf $(OBJS)
--	
--	
-+
-+.PHONY: ps7_init
-+
-+ps7_init:
-+	cp $(BSP_DIR)/$(BOARD)/ps7_init.* .
-+
- $(LIBS): 
- 	echo "Copying BSP files"
- 	$(BSP_DIR)/copy_bsp.sh $(BOARD) $(CC)
-@@ -86,7 +89,7 @@ $(LIBS):
-         make -C $(BSP_DIR) -k all "CC=armcc" "AR=armar" "C_FLAGS= -O2 -c" "EC_FLAGS=--debug --wchar32"; \
- 	fi;
- 
--%.o:%.c
-+%.o:%.c ps7_init
- 	$(CC) $(CC_FLAGS) $(CFLAGS) $(ECFLAGS) -c $< -o $@ $(INCLUDEPATH)
- 
- %.o:%.S

libsupport_zynq/src/exception_vectors.rs

@@ -1,7 +1,11 @@
-use libregister::RegisterR;
+use libregister::{RegisterR, RegisterW};
-use libcortex_a9::{regs::{DFSR, MPIDR}, interrupt_handler};
+use libcortex_a9::{regs::{DFSR, MPIDR, VBAR}, interrupt_handler};
 use libboard_zynq::{println, stdio}; 
 
+pub fn set_vector_table(base_addr: u32){
+    VBAR.write(base_addr);
+}
+
 interrupt_handler!(UndefinedInstruction, undefined_instruction, __irq_stack0_start, __irq_stack1_start, {
     stdio::drop_uart();
     println!("UndefinedInstruction");

libsupport_zynq/src/lib.rs

@@ -9,7 +9,7 @@ pub extern crate alloc;
 pub extern crate compiler_builtins;
 
 pub mod boot;
-mod abort;
+pub mod exception_vectors;
 #[cfg(feature = "panic_handler")]
 mod panic;
 pub mod ram;

llvm/11/clang/default.nix

@@ -0,0 +1,138 @@
+{ lib, stdenv, llvm_meta, fetch, fetchpatch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
+, fixDarwinDylibNames
+, enableManpages ? false
+, enablePolly ? false
+}:
+
+let
+  self = stdenv.mkDerivation ({
+    pname = "clang";
+    inherit version;
+
+    src = fetch "clang" "12sm91qx2m79cvj75a9aazf2x8xybjbd593dv6v7rxficpq8i0ha";
+    inherit clang-tools-extra_src;
+
+    unpackPhase = ''
+      unpackFile $src
+      mv clang-* clang
+      sourceRoot=$PWD/clang
+      unpackFile ${clang-tools-extra_src}
+      mv clang-tools-extra-* $sourceRoot/tools/extra
+    '';
+
+    nativeBuildInputs = [ cmake python3 ]
+      ++ lib.optional enableManpages python3.pkgs.sphinx
+      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
+
+    buildInputs = [ libxml2 libllvm ];
+
+    cmakeFlags = [
+      "-DCLANGD_BUILD_XPC=OFF"
+      "-DLLVM_ENABLE_RTTI=ON"
+    ] ++ lib.optionals enableManpages [
+      "-DCLANG_INCLUDE_DOCS=ON"
+      "-DLLVM_ENABLE_SPHINX=ON"
+      "-DSPHINX_OUTPUT_MAN=ON"
+      "-DSPHINX_OUTPUT_HTML=OFF"
+      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
+    ] ++ lib.optionals enablePolly [
+      "-DWITH_POLLY=ON"
+      "-DLINK_POLLY_INTO_TOOLS=ON"
+    ];
+
+
+    patches = [
+      ./purity.patch
+      # https://reviews.llvm.org/D51899
+      ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-11-12-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
+    ];
+
+    postPatch = ''
+      sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' \
+             -e 's/Args.hasArg(options::OPT_nostdlibinc)/true/' \
+             lib/Driver/ToolChains/*.cpp
+    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
+      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
+    '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      substituteInPlace tools/extra/clangd/CMakeLists.txt \
+        --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
+    '';
+
+    outputs = [ "out" "lib" "dev" "python" ];
+
+    postInstall = ''
+      ln -sv $out/bin/clang $out/bin/cpp
+
+      # Move libclang to 'lib' output
+      moveToOutput "lib/libclang.*" "$lib"
+      moveToOutput "lib/libclang-cpp.*" "$lib"
+      substituteInPlace $out/lib/cmake/clang/ClangTargets-release.cmake \
+          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
+          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
+
+      mkdir -p $python/bin $python/share/{clang,scan-view}
+      mv $out/bin/{git-clang-format,scan-view} $python/bin
+      if [ -e $out/bin/set-xcode-analyzer ]; then
+        mv $out/bin/set-xcode-analyzer $python/bin
+      fi
+      mv $out/share/clang/*.py $python/share/clang
+      mv $out/share/scan-view/*.py $python/share/scan-view
+      rm $out/bin/c-index-test
+      patchShebangs $python/bin
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
+    '';
+
+    passthru = {
+      inherit libllvm;
+      isClang = true;
+      hardeningUnsupportedFlags = [ "fortify3" ];
+    };
+
+    meta = llvm_meta // {
+      homepage = "https://clang.llvm.org/";
+      description = "A C language family frontend for LLVM";
+      longDescription = ''
+        The Clang project provides a language front-end and tooling
+        infrastructure for languages in the C language family (C, C++, Objective
+        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
+        It aims to deliver amazingly fast compiles, extremely useful error and
+        warning messages and to provide a platform for building great source
+        level tools. The Clang Static Analyzer and clang-tidy are tools that
+        automatically find bugs in your code, and are great examples of the sort
+        of tools that can be built using the Clang frontend as a library to
+        parse C/C++ code.
+      '';
+      mainProgram = "clang";
+    };
+  } // lib.optionalAttrs enableManpages {
+    pname = "clang-manpages";
+
+    buildPhase = ''
+      make docs-clang-man
+    '';
+
+    installPhase = ''
+      mkdir -p $out/share/man/man1
+      # Manually install clang manpage
+      cp docs/man/*.1 $out/share/man/man1/
+    '';
+
+    outputs = [ "out" ];
+
+    doCheck = false;
+
+    meta = llvm_meta // {
+      description = "man page for Clang ${version}";
+    };
+  });
+in self

llvm/11/clang/gnu-install-dirs.patch

@@ -0,0 +1,235 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index bb4b801f01c8..77a8b43b22c8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,6 +9,8 @@ endif()
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to conform to")
+   set(CMAKE_CXX_STANDARD_REQUIRED YES)
+   set(CMAKE_CXX_EXTENSIONS NO)
+@@ -447,7 +449,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -457,7 +459,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -477,7 +479,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
+   install(PROGRAMS utils/bash-autocomplete.sh
+-          DESTINATION share/clang
++          DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+           COMPONENT bash-autocomplete)
+   if(NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-bash-autocomplete
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index 704278a0e93b..d25c8d325c71 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -123,9 +123,9 @@ macro(add_clang_library name)
+         install(TARGETS ${lib}
+           COMPONENT ${lib}
+           ${export_to_clangtargets}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          RUNTIME DESTINATION bin)
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+         if (NOT LLVM_ENABLE_IDE)
+           add_llvm_install_targets(install-${lib}
+@@ -170,7 +170,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -185,7 +185,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index 0692fe75a441..6f201e7207d0 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -208,7 +208,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${generated_files}
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ceef4b08637c..8efad5520ca4 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 5cd9ac5cddc1..a197676fedbd 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -165,7 +165,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -196,7 +196,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT LLVM_ENABLE_IDE)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index ec0702d76f18..d25d982f51da 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -47,7 +47,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -61,7 +61,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+     install(PROGRAMS libexec/${LibexecFile}
+-            DESTINATION libexec
++            DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -89,7 +89,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+     install(FILES share/scan-build/${ShareFile}
+-            DESTINATION share/scan-build
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build
+             COMPONENT scan-build)
+   endforeach()
+ 
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index 22edb974bac7..9f140a9a4538 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -22,7 +22,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-view)
+   endforeach()
+ 
+@@ -36,7 +36,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+     install(FILES share/${ShareFile}
+-            DESTINATION share/scan-view
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view
+             COMPONENT scan-view)
+   endforeach()
+ 
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 62f2de0cb15c..6aa66825b6ec 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -10,7 +10,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+ install(PROGRAMS ${CLANG_HMAPTOOL}
+-        DESTINATION bin
++        DESTINATION ${CMAKE_INSTALL_BINDIR}
+         COMPONENT hmaptool)
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})

llvm/11/clang/purity.patch

@@ -0,0 +1,28 @@
+From 4add81bba40dcec62c4ea4481be8e35ac53e89d8 Mon Sep 17 00:00:00 2001
+From: Will Dietz <w@wdtz.org>
+Date: Thu, 18 May 2017 11:56:12 -0500
+Subject: [PATCH] "purity" patch for 5.0
+
+---
+ lib/Driver/ToolChains/Gnu.cpp | 7 -------
+ 1 file changed, 7 deletions(-)
+
+diff --git a/lib/Driver/ToolChains/Gnu.cpp b/lib/Driver/ToolChains/Gnu.cpp
+index fe3c0191bb..c6a482bece 100644
+--- a/lib/Driver/ToolChains/Gnu.cpp
++++ b/lib/Driver/ToolChains/Gnu.cpp
+@@ -487,12 +487,6 @@ void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
+   if (!IsStatic) {
+     if (Args.hasArg(options::OPT_rdynamic))
+       CmdArgs.push_back("-export-dynamic");
+-
+-    if (!Args.hasArg(options::OPT_shared) && !IsStaticPIE) {
+-      CmdArgs.push_back("-dynamic-linker");
+-      CmdArgs.push_back(Args.MakeArgString(Twine(D.DyldPrefix) +
+-                                           ToolChain.getDynamicLinker(Args)));
+-    }
+   }
+ 
+   CmdArgs.push_back("-o");
+-- 
+2.11.0

llvm/11/default.nix

@@ -0,0 +1,299 @@
+{ lowPrio, newScope, pkgs, lib, stdenv, cmake
+, gccForLibs, preLibcCrossHeaders
+, libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
+, buildLlvmTools # tools, but from the previous stage, for cross
+, targetLlvmLibraries # libraries, but from the next stage, for cross
+, targetLlvm
+# This is the default binutils, but with *this* version of LLD rather
+# than the default LLVM version's, if LLD is the choice. We use these for
+# the `useLLVM` bootstrapping below.
+, bootBintoolsNoLibc ?
+    if stdenv.targetPlatform.linker == "lld"
+    then null
+    else pkgs.bintoolsNoLibc
+, bootBintools ?
+    if stdenv.targetPlatform.linker == "lld"
+    then null
+    else pkgs.bintools
+}:
+
+let
+  release_version = "11.1.0";
+  candidate = ""; # empty or "rcN"
+  dash-candidate = lib.optionalString (candidate != "") "-${candidate}";
+  version = "${release_version}${dash-candidate}"; # differentiating these (variables) is important for RCs
+  targetConfig = stdenv.targetPlatform.config;
+
+  fetch = name: sha256: fetchurl {
+    url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${version}/${name}-${release_version}${candidate}.src.tar.xz";
+    inherit sha256;
+  };
+
+  clang-tools-extra_src = fetch "clang-tools-extra" "18n1w1hkv931xzq02b34wglbv6zd6sd0r5kb8piwvag7klj7qw3n";
+
+  llvm_meta = {
+    license     = lib.licenses.ncsa;
+    maintainers = lib.teams.llvm.members;
+
+    # See llvm/cmake/config-ix.cmake.
+    platforms   =
+      lib.platforms.aarch64 ++
+      lib.platforms.arm ++
+      lib.platforms.mips ++
+      lib.platforms.power ++
+      lib.platforms.riscv ++
+      lib.platforms.s390x ++
+      lib.platforms.wasi ++
+      lib.platforms.x86;
+  };
+
+  tools = lib.makeExtensible (tools: let
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
+      rsrc="$out/resource-root"
+      mkdir "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
+      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
+    '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
+      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+      ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
+    '';
+
+  bintoolsNoLibc' =
+    if bootBintoolsNoLibc == null
+    then tools.bintoolsNoLibc
+    else bootBintoolsNoLibc;
+  bintools' =
+    if bootBintools == null
+    then tools.bintools
+    else bootBintools;
+
+  in {
+
+    libllvm = callPackage ./llvm {
+      inherit llvm_meta;
+    };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm;
+
+    libllvm-polly = callPackage ./llvm {
+      inherit llvm_meta;
+      enablePolly = true;
+    };
+
+    llvm-polly = tools.libllvm-polly.lib // { outputSpecified = false; };
+
+    libclang = callPackage ./clang {
+      inherit clang-tools-extra_src llvm_meta;
+    };
+
+    clang-unwrapped = tools.libclang;
+
+    clang-polly-unwrapped = callPackage ./clang {
+      inherit llvm_meta;
+      inherit clang-tools-extra_src;
+      libllvm = tools.libllvm-polly;
+      enablePolly = true;
+    };
+
+    llvm-manpages = lowPrio (tools.libllvm.override {
+      enableManpages = true;
+      python3 = pkgs.python3;  # don't use python-boot
+    });
+
+    clang-manpages = lowPrio (tools.libclang.override {
+      enableManpages = true;
+      python3 = pkgs.python3;  # don't use python-boot
+    });
+
+    # disabled until recommonmark supports sphinx 3
+    # lldb-manpages = lowPrio (tools.lldb.override {
+    #   enableManpages = true;
+    #   python3 = pkgs.python3;  # don't use python-boot
+    # });
+
+    # pick clang appropriate for package set we are targeting
+    clang =
+      /**/ if stdenv.targetPlatform.libc == null then tools.clangNoLibc
+      else if stdenv.targetPlatform.useLLVM or false then tools.clangUseLLVM
+      else if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU then tools.libstdcxxClang
+      else tools.libcxxClang;
+
+    libstdcxxClang = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      # libstdcxx is taken from gcc in an ad-hoc way in cc-wrapper.
+      libcxx = null;
+      extraPackages = [
+        targetLlvmLibraries.compiler-rt
+      ];
+      extraBuildCommands = mkExtraBuildCommands cc;
+    };
+
+    libcxxClang = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = targetLlvmLibraries.libcxx;
+      extraPackages = [
+        libcxx.cxxabi
+        targetLlvmLibraries.compiler-rt
+      ];
+      extraBuildCommands = mkExtraBuildCommands cc;
+    };
+
+    lld = callPackage ./lld {
+      inherit llvm_meta;
+    };
+
+    lldb = callPackage ../common/lldb.nix {
+      src = fetch "lldb" "1vlyg015dyng43xqb8cg2l6r9ix8klibxsajazbfnckdnh54hwxj";
+      patches = [
+        ./lldb/procfs.patch
+        ./lldb/gnu-install-dirs.patch
+      ];
+      inherit llvm_meta;
+    };
+
+    # Below, is the LLVM bootstrapping logic. It handles building a
+    # fully LLVM toolchain from scratch. No GCC toolchain should be
+    # pulled in. As a consequence, it is very quick to build different
+    # targets provided by LLVM and we can also build for what GCC
+    # doesn’t support like LLVM. Probably we should move to some other
+    # file.
+
+    bintools-unwrapped = callPackage ../common/bintools.nix { };
+
+    bintoolsNoLibc = wrapBintoolsWith {
+      bintools = tools.bintools-unwrapped;
+      libc = preLibcCrossHeaders;
+    };
+
+    bintools = wrapBintoolsWith {
+      bintools = tools.bintools-unwrapped;
+    };
+
+    clangUseLLVM = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = targetLlvmLibraries.libcxx;
+      bintools = bintools';
+      extraPackages = [
+        libcxx.cxxabi
+        targetLlvmLibraries.compiler-rt
+      ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
+        targetLlvmLibraries.libunwind
+      ];
+      extraBuildCommands = ''
+        echo "-rtlib=compiler-rt -Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
+        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
+        echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
+        echo "-lunwind" >> $out/nix-support/cc-ldflags
+      '' + lib.optionalString stdenv.targetPlatform.isWasm ''
+        echo "-fno-exceptions" >> $out/nix-support/cc-cflags
+      '' + mkExtraBuildCommands cc;
+    };
+
+    clangNoLibcxx = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = null;
+      bintools = bintools';
+      extraPackages = [
+        targetLlvmLibraries.compiler-rt
+      ];
+      extraBuildCommands = ''
+        echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
+        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
+        echo "-nostdlib++" >> $out/nix-support/cc-cflags
+      '' + mkExtraBuildCommands cc;
+    };
+
+    clangNoLibc = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = null;
+      bintools = bintoolsNoLibc';
+      extraPackages = [
+        targetLlvmLibraries.compiler-rt
+      ];
+      extraBuildCommands = ''
+        echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
+        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
+      '' + mkExtraBuildCommands cc;
+    };
+
+    clangNoCompilerRt = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = null;
+      bintools = bintoolsNoLibc';
+      extraPackages = [ ];
+      extraBuildCommands = ''
+        echo "-nostartfiles" >> $out/nix-support/cc-cflags
+      '' + mkExtraBuildCommands0 cc;
+    };
+
+    clangNoCompilerRtWithLibc = wrapCCWith rec {
+      cc = tools.clang-unwrapped;
+      libcxx = null;
+      bintools = bintools';
+      extraPackages = [ ];
+      extraBuildCommands = mkExtraBuildCommands0 cc;
+    };
+
+  });
+
+  libraries = lib.makeExtensible (libraries: let
+    callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
+  in {
+
+    compiler-rt-libc = callPackage ./compiler-rt {
+      inherit llvm_meta;
+      stdenv = if (stdenv.hostPlatform.useLLVM or false) || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) || (stdenv.hostPlatform.isRiscV && stdenv.hostPlatform.is32bit)
+               then overrideCC stdenv buildLlvmTools.clangNoCompilerRtWithLibc
+               else stdenv;
+    };
+
+    compiler-rt-no-libc = callPackage ./compiler-rt {
+      inherit llvm_meta;
+      stdenv = if (stdenv.hostPlatform.useLLVM or false) || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64)
+               then overrideCC stdenv buildLlvmTools.clangNoCompilerRt
+               else stdenv;
+    };
+
+    # N.B. condition is safe because without useLLVM both are the same.
+    compiler-rt = if stdenv.hostPlatform.isAndroid || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) || (stdenv.hostPlatform.libc == "newlib")
+      then libraries.compiler-rt-libc
+      else libraries.compiler-rt-no-libc;
+
+    stdenv = overrideCC stdenv buildLlvmTools.clang;
+
+    libcxxStdenv = overrideCC stdenv buildLlvmTools.libcxxClang;
+
+    libcxx = callPackage ./libcxx {
+      inherit llvm_meta;
+      stdenv = if (stdenv.hostPlatform.useLLVM or false) || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64)
+               then overrideCC stdenv buildLlvmTools.clangNoLibcxx
+               else stdenv;
+    };
+
+    libcxxabi = callPackage ./libcxxabi {
+      inherit llvm_meta;
+      stdenv = if (stdenv.hostPlatform.useLLVM or false) || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64)
+               then overrideCC stdenv buildLlvmTools.clangNoLibcxx
+               else stdenv;
+    };
+
+    libunwind = callPackage ./libunwind {
+      inherit llvm_meta;
+      stdenv = if (stdenv.hostPlatform.useLLVM or false) || (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64)
+               then overrideCC stdenv buildLlvmTools.clangNoLibcxx
+               else stdenv;
+    };
+
+    openmp = callPackage ./openmp {
+      inherit llvm_meta targetLlvm;
+    };
+  });
+  noExtend = extensible: lib.attrsets.removeAttrs extensible [ "extend" ];
+
+in { inherit tools libraries release_version; } // (noExtend libraries) // (noExtend tools)

llvm/11/llvm/default.nix

@@ -0,0 +1,363 @@
+{ lib, stdenv, llvm_meta
+, pkgsBuildBuild
+, fetch
+, fetchpatch
+, cmake
+, python3
+, libffi
+, enableGoldPlugin ? libbfd.hasPluginAPI
+, libbfd
+, libpfm
+, libxml2
+, ncurses
+, version
+, release_version
+, zlib
+, buildLlvmTools
+, debugVersion ? false
+, doCheck ? stdenv.isLinux && (!stdenv.isx86_32) && (!stdenv.hostPlatform.isMusl) && (!stdenv.hostPlatform.isRiscV)
+  && (stdenv.hostPlatform == stdenv.buildPlatform)
+, enableManpages ? false
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
+# broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+# broken for the armv7l builder
+, enablePFM ? stdenv.isLinux && !stdenv.hostPlatform.isAarch
+, enablePolly ? false # TODO should be on by default
+}:
+
+let
+  inherit (lib) optional optionals optionalString;
+
+  # Used when creating a version-suffixed symlink of libLLVM.dylib
+  shortVersion = with lib;
+    concatStringsSep "." (take 1 (splitString "." release_version));
+
+  # Ordinarily we would just the `doCheck` and `checkDeps` functionality
+  # `mkDerivation` gives us to manage our test dependencies (instead of breaking
+  # out `doCheck` as a package level attribute).
+  #
+  # Unfortunately `lit` does not forward `$PYTHONPATH` to children processes, in
+  # particular the children it uses to do feature detection.
+  #
+  # This means that python deps we add to `checkDeps` (which the python
+  # interpreter is made aware of via `$PYTHONPATH` – populated by the python
+  # setup hook) are not picked up by `lit` which causes it to skip tests.
+  #
+  # Adding `python3.withPackages (ps: [ ... ])` to `checkDeps` also doesn't work
+  # because this package is shadowed in `$PATH` by the regular `python3`
+  # package.
+  #
+  # So, we "manually" assemble one python derivation for the package to depend
+  # on, taking into account whether checks are enabled or not:
+  python = if doCheck then
+    let
+      checkDeps = ps: with ps; [ psutil ];
+    in python3.withPackages checkDeps
+  else python3;
+
+in stdenv.mkDerivation (rec {
+  pname = "llvm";
+  inherit version;
+
+  src = fetch pname "199yq3a214avcbi4kk2q0ajriifkvsr0l2dkx3a666m033ihi1ff";
+  polly_src = fetch "polly" "031r23ijhx7v93a5n33m2nc0x9xyqmx0d8xg80z7q971p6qd63sq";
+
+  unpackPhase = ''
+    unpackFile $src
+    mv llvm-${release_version}* llvm
+    sourceRoot=$PWD/llvm
+  '' + optionalString enablePolly ''
+    unpackFile $polly_src
+    mv polly-* $sourceRoot/tools/polly
+  '';
+
+  outputs = [ "out" "lib" "dev" "python" ];
+
+  nativeBuildInputs = [ cmake python ]
+    ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
+
+  buildInputs = [ libxml2 libffi ]
+    ++ optional enablePFM libpfm; # exegesis
+
+  propagatedBuildInputs = [ ncurses zlib ];
+
+  patches = [
+    # When cross-compiling we configure llvm-config-native with an approximation
+    # of the flags used for the normal LLVM build. To avoid the need for building
+    # a native libLLVM.so (which would fail) we force llvm-config to be linked
+    # statically against the necessary LLVM components always.
+    ../../llvm-config-link-static.patch
+
+    ./gnu-install-dirs.patch
+    # On older CPUs (e.g. Hydra/wendy) we'd be getting an error in this test.
+    (fetchpatch {
+      name = "uops-CMOV16rm-noreg.diff";
+      url = "https://github.com/llvm/llvm-project/commit/9e9f991ac033.diff";
+      sha256 = "sha256:12s8vr6ibri8b48h2z38f3afhwam10arfiqfy4yg37bmc054p5hi";
+      stripLen = 1;
+    })
+    # gcc-11 compat upstream patch
+    (fetchpatch {
+      url = "https://github.com/llvm/llvm-project/commit/b498303066a63a203d24f739b2d2e0e56dca70d1.patch";
+      sha256 = "sha256:0nh123kld0dgz2h941lng331dkj3wbm5lfxm375k1f569gv83hlk";
+      stripLen = 1;
+    })
+
+    # Fix invalid std::string(nullptr) for GCC 12
+    (fetchpatch {
+      name = "nvptx-gcc-12.patch";
+      url = "https://github.com/llvm/llvm-project/commit/99e64623ec9b31def9375753491cc6093c831809.patch";
+      sha256 = "0zjfjgavqzi2ypqwqnlvy6flyvdz8hi1anwv0ybwnm2zqixg7za3";
+      stripLen = 1;
+    })
+    (fetchpatch {
+      name = "dfaemitter-gcc-12.patch";
+      url = "https://github.com/llvm/llvm-project/commit/0841916e87a39e3c223c986e8da31e4a9a1432e3.patch";
+      sha256 = "1kckghvsngs51mqm82asy0s9vr19h8aqbw43a0w44mccqw6bzrwf";
+      stripLen = 1;
+    })
+
+    # Fix musl build.
+    (fetchpatch {
+      url = "https://github.com/llvm/llvm-project/commit/5cd554303ead0f8891eee3cd6d25cb07f5a7bf67.patch";
+      relative = "llvm";
+      hash = "sha256-XPbvNJ45SzjMGlNUgt/IgEvM2dHQpDOe6woUJY+nUYA=";
+    })
+
+    # Backport gcc-13 fixes with missing includes.
+    (fetchpatch {
+      name = "signals-gcc-13.patch";
+      url = "https://github.com/llvm/llvm-project/commit/ff1681ddb303223973653f7f5f3f3435b48a1983.patch";
+      hash = "sha256-CXwYxQezTq5vdmc8Yn88BUAEly6YZ5VEIA6X3y5NNOs=";
+      stripLen = 1;
+    })
+    (fetchpatch {
+      name = "base64-gcc-13.patch";
+      url = "https://github.com/llvm/llvm-project/commit/5e9be93566f39ee6cecd579401e453eccfbe81e5.patch";
+      hash = "sha256-PAwrVrvffPd7tphpwCkYiz+67szPRzRB2TXBvKfzQ7U=";
+      stripLen = 1;
+    })
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
+
+  postPatch = optionalString stdenv.isDarwin ''
+    substituteInPlace cmake/modules/AddLLVM.cmake \
+      --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
+  '' + ''
+    # FileSystem permissions tests fail with various special bits
+    substituteInPlace unittests/Support/CMakeLists.txt \
+      --replace "Path.cpp" ""
+    rm unittests/Support/Path.cpp
+  '' + optionalString stdenv.hostPlatform.isMusl ''
+    patch -p1 -i ${../../TLI-musl.patch}
+    substituteInPlace unittests/Support/CMakeLists.txt \
+      --replace "add_subdirectory(DynamicLibrary)" ""
+    rm unittests/Support/DynamicLibrary/DynamicLibraryTest.cpp
+    # valgrind unhappy with musl or glibc, but fails w/musl only
+    rm test/CodeGen/AArch64/wineh4.mir
+  '' + optionalString stdenv.hostPlatform.isAarch32 ''
+    # skip failing X86 test cases on 32-bit ARM
+    rm test/DebugInfo/X86/convert-debugloc.ll
+    rm test/DebugInfo/X86/convert-inlined.ll
+    rm test/DebugInfo/X86/convert-linked.ll
+    rm test/tools/dsymutil/X86/op-convert.test
+    rm test/tools/gold/X86/split-dwarf.ll
+    rm test/tools/llvm-readobj/ELF/dependent-libraries.test
+  '' + optionalString (stdenv.hostPlatform.system == "armv6l-linux") ''
+    # Seems to require certain floating point hardware (NEON?)
+    rm test/ExecutionEngine/frem.ll
+  '' + ''
+    patchShebangs test/BugPoint/compile-custom.ll.py
+  '' + ''
+    # Tweak tests to ignore namespace part of type to support
+    # gcc-12: https://gcc.gnu.org/PR103598.
+    # The change below mangles strings like:
+    #    CHECK-NEXT: Starting llvm::Function pass manager run.
+    # to:
+    #    CHECK-NEXT: Starting {{.*}}Function pass manager run.
+    for f in \
+      test/Other/new-pass-manager.ll \
+      test/Other/new-pm-defaults.ll \
+      test/Other/new-pm-lto-defaults.ll \
+      test/Other/new-pm-thinlto-defaults.ll \
+      test/Other/pass-pipeline-parsing.ll \
+      test/Transforms/Inline/cgscc-incremental-invalidate.ll \
+      test/Transforms/Inline/clear-analyses.ll \
+      test/Transforms/LoopUnroll/unroll-loop-invalidation.ll \
+      test/Transforms/SCCP/ipsccp-preserve-analysis.ll \
+      test/Transforms/SCCP/preserve-analysis.ll \
+      test/Transforms/SROA/dead-inst.ll \
+      test/tools/gold/X86/new-pm.ll \
+      ; do
+      echo "PATCH: $f"
+      substituteInPlace $f \
+        --replace 'Starting llvm::' 'Starting {{.*}}' \
+        --replace 'Finished llvm::' 'Finished {{.*}}'
+    done
+  '';
+
+  preConfigure = ''
+    # Workaround for configure flags that need to have spaces
+    cmakeFlagsArray+=(
+      -DLLVM_LIT_ARGS='-svj''${NIX_BUILD_CORES} --no-progress-bar'
+    )
+  '';
+
+  # hacky fix: created binaries need to be run before installation
+  preBuild = ''
+    mkdir -p $out/
+    ln -sv $PWD/lib $out
+  '';
+
+  # E.g. mesa.drivers use the build-id as a cache key (see #93946):
+  LDFLAGS = optionalString (enableSharedLibraries && !stdenv.isDarwin) "-Wl,--build-id=sha1";
+
+  cmakeBuildType = if debugVersion then "Debug" else "Release";
+
+  cmakeFlags = with stdenv; let
+    # These flags influence llvm-config's BuildVariables.inc in addition to the
+    # general build. We need to make sure these are also passed via
+    # CROSS_TOOLCHAIN_FLAGS_NATIVE when cross-compiling or llvm-config-native
+    # will return different results from the cross llvm-config.
+    #
+    # Some flags don't need to be repassed because LLVM already does so (like
+    # CMAKE_BUILD_TYPE), others are irrelevant to the result.
+    flagsForLlvmConfig = [
+      "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
+      "-DLLVM_ENABLE_RTTI=ON"
+    ] ++ optionals enableSharedLibraries [
+      "-DLLVM_LINK_LLVM_DYLIB=ON"
+    ];
+  in flagsForLlvmConfig ++ [
+    "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
+    "-DLLVM_BUILD_TESTS=${if doCheck then "ON" else "OFF"}"
+    "-DLLVM_ENABLE_FFI=ON"
+    "-DLLVM_HOST_TRIPLE=${stdenv.hostPlatform.config}"
+    "-DLLVM_DEFAULT_TARGET_TRIPLE=${stdenv.hostPlatform.config}"
+    "-DLLVM_ENABLE_DUMP=ON"
+  ] ++ optionals stdenv.hostPlatform.isStatic [
+    # Disables building of shared libs, -fPIC is still injected by cc-wrapper
+    "-DLLVM_ENABLE_PIC=OFF"
+    "-DLLVM_BUILD_STATIC=ON"
+    # libxml2 needs to be disabled because the LLVM build system ignores its .la
+    # file and doesn't link zlib as well.
+    # https://github.com/ClangBuiltLinux/tc-build/issues/150#issuecomment-845418812
+    "-DLLVM_ENABLE_LIBXML2=OFF"
+    # This is a Shared Library not tied to LLVM_ENABLE_PIC
+    "-DLLVM_TOOL_REMARKS_SHLIB_BUILD=OFF"
+  ] ++ optionals enableManpages [
+    "-DLLVM_BUILD_DOCS=ON"
+    "-DLLVM_ENABLE_SPHINX=ON"
+    "-DSPHINX_OUTPUT_MAN=ON"
+    "-DSPHINX_OUTPUT_HTML=OFF"
+    "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+  ] ++ optionals (enableGoldPlugin) [
+    "-DLLVM_BINUTILS_INCDIR=${libbfd.dev}/include"
+  ] ++ optionals isDarwin [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DCAN_TARGET_i386=false"
+  ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DCMAKE_CROSSCOMPILING=True"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+        # We need to repass the custom GNUInstallDirs values, otherwise CMake
+        # will choose them for us, leading to wrong results in llvm-config-native
+        nativeInstallFlags = [
+          "-DCMAKE_INSTALL_PREFIX=${placeholder "out"}"
+          "-DCMAKE_INSTALL_BINDIR=${placeholder "out"}/bin"
+          "-DCMAKE_INSTALL_INCLUDEDIR=${placeholder "dev"}/include"
+          "-DCMAKE_INSTALL_LIBDIR=${placeholder "lib"}/lib"
+          "-DCMAKE_INSTALL_LIBEXECDIR=${placeholder "lib"}/libexec"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list="
+      + lib.concatStringsSep ";" (lib.concatLists [
+        flagsForLlvmConfig
+        nativeToolchainFlags
+        nativeInstallFlags
+      ])
+    )
+  ];
+
+  postBuild = ''
+    rm -fR $out
+  '';
+
+  preCheck = ''
+    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}$PWD/lib
+  '';
+
+  postInstall = ''
+    mkdir -p $python/share
+    mv $out/share/opt-viewer $python/share/opt-viewer
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
+  ''
+  + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
+    ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
+    ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
+  '';
+
+  inherit doCheck;
+
+  checkTarget = "check-all";
+
+  requiredSystemFeatures = [ "big-parallel" ];
+  meta = llvm_meta // {
+    homepage = "https://llvm.org/";
+    description = "A collection of modular and reusable compiler and toolchain technologies";
+    longDescription = ''
+      The LLVM Project is a collection of modular and reusable compiler and
+      toolchain technologies. Despite its name, LLVM has little to do with
+      traditional virtual machines. The name "LLVM" itself is not an acronym; it
+      is the full name of the project.
+      LLVM began as a research project at the University of Illinois, with the
+      goal of providing a modern, SSA-based compilation strategy capable of
+      supporting both static and dynamic compilation of arbitrary programming
+      languages. Since then, LLVM has grown to be an umbrella project consisting
+      of a number of subprojects, many of which are being used in production by
+      a wide variety of commercial and open source projects as well as being
+      widely used in academic research. Code in the LLVM project is licensed
+      under the "Apache 2.0 License with LLVM exceptions".
+    '';
+  };
+} // lib.optionalAttrs enableManpages {
+  pname = "llvm-manpages";
+
+  buildPhase = ''
+    make docs-llvm-man
+  '';
+
+  propagatedBuildInputs = [];
+
+  installPhase = ''
+    make -C docs install
+  '';
+
+  postPatch = null;
+  postInstall = null;
+
+  outputs = [ "out" ];
+
+  doCheck = false;
+
+  meta = llvm_meta // {
+    description = "man pages for LLVM ${version}";
+  };
+})

llvm/11/llvm/gnu-install-dirs-polly.patch

@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 211f95512717..f9e04a4844b6 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 86de6f10686e..91f30891ccbe 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 1039079cb49c..28b499ae1e9e 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -275,7 +275,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE

llvm/11/llvm/gnu-install-dirs.patch

@@ -0,0 +1,417 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 247ad36d3845..815e2c4ba955 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -269,15 +269,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -559,9 +565,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -1107,7 +1113,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1119,7 +1125,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1134,13 +1140,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index b74adc11ade9..a5aa258cde30 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -766,9 +766,9 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              RUNTIME DESTINATION bin COMPONENT ${name})
++              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -981,7 +981,7 @@ function(process_llvm_pass_plugins)
+           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+       install(FILES
+           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
++          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
+           COMPONENT cmake-exports)
+ 
+       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
+@@ -1201,7 +1201,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1819,7 +1819,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1836,7 +1836,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1859,7 +1859,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1942,7 +1942,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -2064,9 +2065,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 554046b20edf..4d1ad980641e 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index b5babb30abcf..190b1222a9f9 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -84,7 +84,7 @@ function (add_sphinx_target builder project)
+         endif()
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 4b8879f65fe4..f01920bcc60f 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -108,13 +108,13 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+ set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+ set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ 
+ # Generate a default location for lit
+ if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index 1f908d3e95b1..1315e0aa40e1 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -516,8 +516,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -548,13 +548,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -752,9 +772,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
+index bb96edb4b4bf..678c22fb43c8 100644
+--- a/examples/Bye/CMakeLists.txt
++++ b/examples/Bye/CMakeLists.txt
+@@ -14,6 +14,6 @@ if (NOT WIN32)
+     BUILDTREE_ONLY
+    )
+ 
+-  install(TARGETS ${name} RUNTIME DESTINATION examples)
++  install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endif()
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index b46319f24fc8..2feabd1954e4 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -5,5 +5,5 @@ add_subdirectory(Frontend)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index 63cef75368b7..6295478b1f3d 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +23,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 7e74b7c90816..f185e9283f83 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -358,12 +358,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = std::string(path.str());
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 2963f97cad88..69d66c9c9ca1 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -25,7 +25,7 @@ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS
+     intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index ead73ec13a8f..250362021f17 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,7 +8,7 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
+ 
+diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
+index e948496c603a..1f4df8a98b10 100644
+--- a/tools/remarks-shlib/CMakeLists.txt
++++ b/tools/remarks-shlib/CMakeLists.txt
+@@ -11,7 +11,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.exports)
+ add_llvm_library(Remarks SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES})
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT Remarks)
+ 
+ if (APPLE)

llvm/TLI-musl.patch

@@ -0,0 +1,35 @@
+From 5c571082fdaf61f6df19d9b7137dc26d71334058 Mon Sep 17 00:00:00 2001
+From: Natanael Copa <ncopa@alpinelinux.org>
+Date: Thu, 18 Feb 2016 10:33:04 +0100
+Subject: [PATCH 2/3] Fix build with musl libc
+
+On musl libc the fopen64 and fopen are the same thing, but for
+compatibility they have a `#define fopen64 fopen`. Same applies for
+fseek64, fstat64, fstatvfs64, ftello64, lstat64, stat64 and tmpfile64.
+---
+ include/llvm/Analysis/TargetLibraryInfo.h | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/include/llvm/Analysis/TargetLibraryInfo.h b/include/llvm/Analysis/TargetLibraryInfo.h
+index 7becdf0..7f14427 100644
+--- a/include/llvm/Analysis/TargetLibraryInfo.h
++++ b/include/llvm/Analysis/TargetLibraryInfo.h
+@@ -18,6 +18,15 @@
+ #include "llvm/IR/Module.h"
+ #include "llvm/Pass.h"
+ 
++#undef fopen64
++#undef fseeko64
++#undef fstat64
++#undef fstatvfs64
++#undef ftello64
++#undef lstat64
++#undef stat64
++#undef tmpfile64
++
+ namespace llvm {
+ /// VecDesc - Describes a possible vectorization of a function.
+ /// Function 'VectorFnName' is equivalent to 'ScalarFnName' vectorized
+-- 
+2.7.3
+

llvm/aarch64.patch

@@ -0,0 +1,51 @@
+--- lib/Support/Unix/Memory.inc
++++ lib/Support/Unix/Memory.inc
+@@ -126,8 +126,12 @@
+   Result.Address = Addr;
+   Result.Size = NumPages*PageSize;
+ 
+-  if (PFlags & MF_EXEC)
+-    Memory::InvalidateInstructionCache(Result.Address, Result.Size);
++  // Rely on protectMappedMemory to invalidate instruction cache.
++  if (PFlags & MF_EXEC) {
++    EC = Memory::protectMappedMemory (Result, PFlags);
++    if (EC != std::error_code())
++      return MemoryBlock();
++  }
+ 
+   return Result;
+ }
+@@ -156,15 +160,31 @@
+     return std::error_code(EINVAL, std::generic_category());
+ 
+   int Protect = getPosixProtectionFlags(Flags);
+-
+   uintptr_t Start = alignAddr((uint8_t *)M.Address - PageSize + 1, PageSize);
+   uintptr_t End = alignAddr((uint8_t *)M.Address + M.Size, PageSize);
++
++  bool InvalidateCache = (Flags & MF_EXEC);
++
++#if defined(__arm__) || defined(__aarch64__)
++  // Certain ARM implementations treat icache clear instruction as a memory read,
++  // and CPU segfaults on trying to clear cache on !PROT_READ page.  Therefore we need
++  // to temporarily add PROT_READ for the sake of flushing the instruction caches.
++  if (InvalidateCache && !(Protect & PROT_READ)) {
++    int Result = ::mprotect((void *)Start, End - Start, Protect | PROT_READ);
++    if (Result != 0)
++      return std::error_code(errno, std::generic_category());
++
++    Memory::InvalidateInstructionCache(M.Address, M.Size);
++    InvalidateCache = false;
++  }
++#endif
++
+   int Result = ::mprotect((void *)Start, End - Start, Protect);
+ 
+   if (Result != 0)
+     return std::error_code(errno, std::generic_category());
+ 
+-  if (Flags & MF_EXEC)
++  if (InvalidateCache)
+     Memory::InvalidateInstructionCache(M.Address, M.Size);
+ 
+   return std::error_code();

llvm/clang-11-12-LLVMgold-path.patch

@@ -0,0 +1,13 @@
+diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
+index 6b6e276b8ce7..7896542a1202 100644
+--- a/lib/Driver/ToolChains/CommonArgs.cpp
++++ b/lib/Driver/ToolChains/CommonArgs.cpp
+@@ -409,7 +409,7 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
+ 
+     SmallString<1024> Plugin;
+     llvm::sys::path::native(
+-        Twine(D.Dir) + "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" + Suffix,
++        Twine("@libllvmLibdir@" "/LLVMgold") + Suffix,
+         Plugin);
+     CmdArgs.push_back(Args.MakeArgString(Plugin));
+   }

llvm/clang-6-10-LLVMgold-path.patch

@@ -0,0 +1,15 @@
+diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
+index 37ec73468570..b73e75aa6e59 100644
+--- a/lib/Driver/ToolChains/CommonArgs.cpp
++++ b/lib/Driver/ToolChains/CommonArgs.cpp
+@@ -370,8 +370,8 @@ void tools::AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
+ #endif
+ 
+   SmallString<1024> Plugin;
+-  llvm::sys::path::native(Twine(ToolChain.getDriver().Dir) +
+-                              "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" +
++  llvm::sys::path::native(Twine("@libllvmLibdir@"
++                                "/LLVMgold") +
+                               Suffix,
+                           Plugin);
+   CmdArgs.push_back(Args.MakeArgString(Plugin));

llvm/common/bintools.nix

@@ -0,0 +1,48 @@
+{ lib, runCommand, stdenv, llvm, lld, version, release_version }:
+
+let
+  targetPrefix = lib.optionalString (stdenv.hostPlatform != stdenv.targetPlatform) "${stdenv.targetPlatform.config}-";
+in
+runCommand "llvm-binutils-${version}"
+{
+  preferLocalBuild = true;
+  passthru = {
+    isLLVM = true;
+  };
+}
+  (''
+    mkdir -p $out/bin
+    for prog in ${lld}/bin/*; do
+      ln -s $prog $out/bin/${targetPrefix}$(basename $prog)
+    done
+    for prog in ${llvm}/bin/*; do
+      ln -sf $prog $out/bin/${targetPrefix}$(basename $prog)
+    done
+
+    llvmBin="${llvm}/bin"
+
+    ln -s $llvmBin/llvm-ar $out/bin/${targetPrefix}ar
+    ln -s $llvmBin/llvm-ar $out/bin/${targetPrefix}dlltool
+    ln -s $llvmBin/llvm-ar $out/bin/${targetPrefix}ranlib
+    ln -s $llvmBin/llvm-cxxfilt $out/bin/${targetPrefix}c++filt
+    ln -s $llvmBin/llvm-dwp $out/bin/${targetPrefix}dwp
+    ln -s $llvmBin/llvm-nm $out/bin/${targetPrefix}nm
+    ln -s $llvmBin/llvm-objcopy $out/bin/${targetPrefix}objcopy
+    ln -s $llvmBin/llvm-objcopy $out/bin/${targetPrefix}strip
+    ln -s $llvmBin/llvm-objdump $out/bin/${targetPrefix}objdump
+    ln -s $llvmBin/llvm-readobj $out/bin/${targetPrefix}readelf
+    ln -s $llvmBin/llvm-size $out/bin/${targetPrefix}size
+    ln -s $llvmBin/llvm-strings $out/bin/${targetPrefix}strings
+    ln -s $llvmBin/llvm-symbolizer $out/bin/${targetPrefix}addr2line
+
+    if [ -e "$llvmBin/llvm-debuginfod" ]; then
+      ln -s $llvmBin/llvm-debuginfod $out/bin/${targetPrefix}debuginfod
+      ln -s $llvmBin/llvm-debuginfod-find $out/bin/${targetPrefix}debuginfod-find
+    fi
+
+    ln -s ${lld}/bin/lld $out/bin/${targetPrefix}ld
+
+    # Only >=13 show GNU windres compatible in help
+  '' + lib.optionalString (lib.versionAtLeast release_version "13") ''
+    ln -s $llvmBin/llvm-rc $out/bin/${targetPrefix}windres
+  '')

llvm/common/clang/5-8-purity.patch

@@ -0,0 +1,30 @@
+From 4add81bba40dcec62c4ea4481be8e35ac53e89d8 Mon Sep 17 00:00:00 2001
+From: Will Dietz <w@wdtz.org>
+Date: Thu, 18 May 2017 11:56:12 -0500
+Subject: [PATCH] "purity" patch for 5.0
+
+---
+ lib/Driver/ToolChains/Gnu.cpp | 7 -------
+ 1 file changed, 7 deletions(-)
+
+diff --git a/lib/Driver/ToolChains/Gnu.cpp b/lib/Driver/ToolChains/Gnu.cpp
+index fe3c0191bb..c6a482bece 100644
+--- a/lib/Driver/ToolChains/Gnu.cpp
++++ b/lib/Driver/ToolChains/Gnu.cpp
+@@ -494,13 +494,6 @@ void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
+   if (!Args.hasArg(options::OPT_static)) {
+     if (Args.hasArg(options::OPT_rdynamic))
+       CmdArgs.push_back("-export-dynamic");
+-
+-    if (!Args.hasArg(options::OPT_shared)) {
+-      const std::string Loader =
+-          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
+-      CmdArgs.push_back("-dynamic-linker");
+-      CmdArgs.push_back(Args.MakeArgString(Loader));
+-    }
+   }
+ 
+   CmdArgs.push_back("-o");
+-- 
+2.11.0
+

llvm/common/clang/add-nostdlibinc-flag.patch

@@ -0,0 +1,18 @@
+diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
+index 3f29afd35971..223d2769cdfc 100644
+--- a/lib/Driver/Driver.cpp
++++ b/lib/Driver/Driver.cpp
+@@ -491,6 +491,13 @@ DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
+   }
+ #endif
+ 
++  {
++    Arg *A = DAL->MakeFlagArg(/*BaseArg=*/nullptr,
++                              Opts.getOption(options::OPT_nostdlibinc));
++    A->claim();
++    DAL->append(A);
++  }
++
+   return DAL;
+ }
+ 

llvm/common/lldb.nix

@@ -0,0 +1,196 @@
+{ lib
+, stdenv
+, llvm_meta
+, release_version
+, cmake
+, zlib
+, ncurses
+, swig
+, which
+, libedit
+, libxml2
+, libllvm
+, libclang
+, python3
+, version
+, darwin
+, lit
+, makeWrapper
+, lua5_3
+, ninja
+, runCommand
+, src ? null
+, monorepoSrc ? null
+, patches ? [ ]
+, enableManpages ? false
+}:
+
+let
+  src' =
+    if monorepoSrc != null then
+      runCommand "lldb-src-${version}" { } ''
+        mkdir -p "$out"
+        cp -r ${monorepoSrc}/cmake "$out"
+        cp -r ${monorepoSrc}/lldb "$out"
+      '' else src;
+in
+
+stdenv.mkDerivation (rec {
+  passthru.monorepoSrc = monorepoSrc;
+  pname = "lldb";
+  inherit version;
+
+  src = src';
+  inherit patches;
+
+  outputs = [ "out" "lib" "dev" ];
+
+  sourceRoot = lib.optional (lib.versionAtLeast release_version "13") "${src.name}/${pname}";
+
+  nativeBuildInputs = [
+    cmake
+    python3
+    which
+    swig
+    lit
+    makeWrapper
+    lua5_3
+  ] ++ lib.optionals enableManpages [
+    python3.pkgs.sphinx
+    python3.pkgs.recommonmark
+  ] ++ lib.optionals (lib.versionAtLeast release_version "14") [
+    ninja
+  ];
+
+  buildInputs = [
+    ncurses
+    zlib
+    libedit
+    libxml2
+    libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.libobjc
+    darwin.apple_sdk.libs.xpc
+    darwin.apple_sdk.frameworks.Foundation
+    darwin.bootstrap_cmds
+    darwin.apple_sdk.frameworks.Carbon
+    darwin.apple_sdk.frameworks.Cocoa
+  ]
+  # The older libSystem used on x86_64 macOS is missing the
+  # `<bsm/audit_session.h>` header which `lldb` uses.
+  #
+  # We copy this header over from macOS 10.12 SDK.
+  #
+  # See here for context:
+  # https://github.com/NixOS/nixpkgs/pull/194634#issuecomment-1272129132
+  ++ lib.optional
+    (
+      stdenv.targetPlatform.isDarwin
+        && !stdenv.targetPlatform.isAarch64
+        && (lib.versionAtLeast release_version "15")
+    )
+    (
+      runCommand "bsm-audit-session-header" { } ''
+        install -Dm444 \
+          "${lib.getDev darwin.apple_sdk.sdk}/include/bsm/audit_session.h" \
+          "$out/include/bsm/audit_session.h"
+      ''
+    );
+
+  hardeningDisable = [ "format" ];
+
+  cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
+    "-DLLVM_ENABLE_RTTI=OFF"
+    "-DClang_DIR=${lib.getDev libclang}/lib/cmake"
+    "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
+  ] ++ lib.optionals stdenv.isDarwin [
+    "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON"
+  ] ++ lib.optionals (!stdenv.isDarwin) [
+    "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+  ] ++ lib.optionals enableManpages ([
+    "-DLLVM_ENABLE_SPHINX=ON"
+    "-DSPHINX_OUTPUT_MAN=ON"
+    "-DSPHINX_OUTPUT_HTML=OFF"
+  ] ++ lib.optionals (lib.versionAtLeast release_version "15") [
+    # docs reference `automodapi` but it's not added to the extensions list when
+    # only building the manpages:
+    # https://github.com/llvm/llvm-project/blob/af6ec9200b09039573d85e349496c4f5b17c3d7f/lldb/docs/conf.py#L54
+    #
+    # so, we just ignore the resulting errors
+    "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+  ]) ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
+  ];
+
+  doCheck = false;
+  doInstallCheck = lib.versionOlder release_version "15";
+
+  # TODO: cleanup with mass-rebuild
+  installCheckPhase = ''
+    if [ ! -e $lib/${python3.sitePackages}/lldb/_lldb*.so ] ; then
+        echo "ERROR: python files not installed where expected!";
+        return 1;
+    fi
+  '' # Something lua is built on older versions but this file doesn't exist.
+  + lib.optionalString (lib.versionAtLeast release_version "14") ''
+    if [ ! -e "$lib/lib/lua/${lua5_3.luaversion}/lldb.so" ] ; then
+        echo "ERROR: lua files not installed where expected!";
+        return 1;
+    fi
+  '';
+
+  postInstall = ''
+    wrapProgram $out/bin/lldb --prefix PYTHONPATH : $lib/${python3.sitePackages}/
+
+    # Editor support
+    # vscode:
+    install -D ../tools/lldb-vscode/package.json $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/package.json
+    mkdir -p $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    ln -s $out/bin/*-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+  '';
+
+  meta = llvm_meta // {
+    homepage = "https://lldb.llvm.org/";
+    description = "A next-generation high-performance debugger";
+    longDescription = ''
+      LLDB is a next generation, high-performance debugger. It is built as a set
+      of reusable components which highly leverage existing libraries in the
+      larger LLVM Project, such as the Clang expression parser and LLVM
+      disassembler.
+    '';
+    # llvm <10 never built on aarch64-darwin since first introduction in nixpkgs
+    broken =
+      (lib.versionOlder release_version "11" && stdenv.isDarwin && stdenv.isAarch64)
+        || (((lib.versions.major release_version) == "13") && stdenv.isDarwin);
+  };
+} // lib.optionalAttrs enableManpages {
+  pname = "lldb-manpages";
+
+  buildPhase = lib.optionalString (lib.versionOlder release_version "15") ''
+    make ${if (lib.versionOlder release_version "12") then "docs-man" else "docs-lldb-man"}
+  '';
+
+
+  ninjaFlags = lib.optionals (lib.versionAtLeast release_version "15") [ "docs-lldb-man" ];
+
+  propagatedBuildInputs = [ ];
+
+  # manually install lldb man page
+  installPhase = ''
+    mkdir -p $out/share/man/man1
+    install docs/man/lldb.1 -t $out/share/man/man1/
+  '';
+
+  postPatch = null;
+  postInstall = null;
+
+  outputs = [ "out" ];
+
+  doCheck = false;
+
+  meta = llvm_meta // {
+    description = "man pages for LLDB ${version}";
+  };
+})

llvm/exegesis-force-bdver2.patch

@@ -0,0 +1,11 @@
+diff --git a/test/tools/llvm-exegesis/X86/uops-CMOV16rm-noreg.s b/test/tools/llvm-exegesis/X86/uops-CMOV16rm-noreg.s
+index 3fc1f31d54dc..a4c9bdd92131 100644
+--- a/test/tools/llvm-exegesis/X86/uops-CMOV16rm-noreg.s
++++ b/test/tools/llvm-exegesis/X86/uops-CMOV16rm-noreg.s
+@@ -1,5 +1,6 @@
+ # RUN: llvm-exegesis -mode=uops -opcode-name=CMOV16rm  -benchmarks-file=%t.CMOV16rm-uops.yaml
+ # RUN: FileCheck -check-prefixes=CHECK-YAML -input-file=%t.CMOV16rm-uops.yaml %s
++# RUN: sed -i 's,cpu_name:.*,cpu_name: bdver2,g' %t.CMOV16rm-uops.yaml
+ # RUN: llvm-exegesis -mcpu=bdver2 -mode=analysis -benchmarks-file=%t.CMOV16rm-uops.yaml -analysis-clusters-output-file=- -analysis-clustering-epsilon=0.1 -analysis-inconsistency-epsilon=0.1 -analysis-numpoints=1 -analysis-clustering=naive | FileCheck -check-prefixes=CHECK-CLUSTERS %s
+ 
+ # https://bugs.llvm.org/show_bug.cgi?id=41448

llvm/libcxx-0001-musl-hacks.patch

@@ -0,0 +1,39 @@
+From 1c936d7fda3275265e37f93697232a1ed652390f Mon Sep 17 00:00:00 2001
+From: Will Dietz <w@wdtz.org>
+Date: Sat, 9 Jul 2016 19:22:54 -0500
+Subject: [PATCH] musl fixes/hacks
+
+Conflicts:
+
+	include/__config
+	include/locale
+	src/locale.cpp
+---
+ include/locale |    4 ++--
+ 1 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/locale b/include/locale
+index 3d804e8..9b01f5b 100644
+--- a/include/locale
++++ b/include/locale
+@@ -695,7 +695,7 @@ __num_get_signed_integral(const char* __a, const char* __a_end,
+         typename remove_reference<decltype(errno)>::type __save_errno = errno;
+         errno = 0;
+         char *__p2;
+-        long long __ll = strtoll_l(__a, &__p2, __base, _LIBCPP_GET_C_LOCALE);
++        long long __ll = strtoll(__a, &__p2, __base);
+         typename remove_reference<decltype(errno)>::type __current_errno = errno;
+         if (__current_errno == 0)
+             errno = __save_errno;
+@@ -735,7 +735,7 @@ __num_get_unsigned_integral(const char* __a, const char* __a_end,
+         typename remove_reference<decltype(errno)>::type __save_errno = errno;
+         errno = 0;
+         char *__p2;
+-        unsigned long long __ll = strtoull_l(__a, &__p2, __base, _LIBCPP_GET_C_LOCALE);
++        unsigned long long __ll = strtoull(__a, &__p2, __base);
+         typename remove_reference<decltype(errno)>::type __current_errno = errno;
+         if (__current_errno == 0)
+             errno = __save_errno;
+-- 
+1.7.1
+

llvm/llvm-7-musl.patch

@@ -0,0 +1,92 @@
+From 8c747d3157df2830eed9205e7caf1203b345de17 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sat, 4 Feb 2023 13:54:41 -0800
+Subject: [PATCH] cmake: Enable 64bit off_t on 32bit glibc systems
+
+Pass -D_FILE_OFFSET_BITS=64 to compiler flags on 32bit glibc based
+systems. This will make sure that 64bit versions of LFS functions are
+used e.g. seek will behave same as lseek64. Also revert [1] partially
+because this added a cmake test to detect lseek64 but then forgot to
+pass the needed macro to actual compile, this test was incomplete too
+since libc implementations like musl has 64bit off_t by default on 32bit
+systems and does not bundle[2] -D_LARGEFILE64_SOURCE under -D_GNU_SOURCE
+like glibc, which means the compile now fails on musl because the cmake
+check passes but we do not have _LARGEFILE64_SOURCE defined. Using the
+*64 function was transitional anyways so use -D_FILE_OFFSET_BITS=64
+instead
+
+[1] https://github.com/llvm/llvm-project/commit/8db7e5e4eed4c4e697dc3164f2c9351d8c3e942b
+[2] https://git.musl-libc.org/cgit/musl/commit/?id=25e6fee27f4a293728dd15b659170e7b9c7db9bc
+
+Reviewed By: MaskRay
+
+Differential Revision: https://reviews.llvm.org/D139752
+
+(cherry picked from commit 5cd554303ead0f8891eee3cd6d25cb07f5a7bf67)
+---
+ cmake/config-ix.cmake              | 13 ++++++++++---
+ include/llvm/Config/config.h.cmake |  3 ---
+ lib/Support/raw_ostream.cpp        |  2 --
+ 3 files changed, 10 insertions(+), 8 deletions(-)
+
+diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
+index 18977d9950ff..b558aa83fa62 100644
+--- a/cmake/config-ix.cmake
++++ b/cmake/config-ix.cmake
+@@ -197,9 +197,6 @@ check_symbol_exists(posix_fallocate fcntl.h HAVE_POSIX_FALLOCATE)
+ if( HAVE_SIGNAL_H AND NOT LLVM_USE_SANITIZER MATCHES ".*Address.*" AND NOT APPLE )
+   check_symbol_exists(sigaltstack signal.h HAVE_SIGALTSTACK)
+ endif()
+-set(CMAKE_REQUIRED_DEFINITIONS "-D_LARGEFILE64_SOURCE")
+-check_symbol_exists(lseek64 "sys/types.h;unistd.h" HAVE_LSEEK64)
+-set(CMAKE_REQUIRED_DEFINITIONS "")
+ check_symbol_exists(mallctl malloc_np.h HAVE_MALLCTL)
+ check_symbol_exists(mallinfo malloc.h HAVE_MALLINFO)
+ check_symbol_exists(malloc_zone_statistics malloc/malloc.h
+@@ -237,6 +234,16 @@ if( PURE_WINDOWS )
+   check_function_exists(__main HAVE___MAIN)
+   check_function_exists(__cmpdi2 HAVE___CMPDI2)
+ endif()
++
++check_symbol_exists(__GLIBC__ stdio.h LLVM_USING_GLIBC)
++if( LLVM_USING_GLIBC )
++# enable 64bit off_t on 32bit systems using glibc
++  if (CMAKE_SIZEOF_VOID_P EQUAL 4)
++    add_compile_definitions(_FILE_OFFSET_BITS=64)
++    list(APPEND CMAKE_REQUIRED_DEFINITIONS "-D_FILE_OFFSET_BITS=64")
++  endif()
++endif()
++
+ if( HAVE_DLFCN_H )
+   if( HAVE_LIBDL )
+     list(APPEND CMAKE_REQUIRED_LIBRARIES dl)
+diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
+index e934617d7ec7..3c39c373b3c1 100644
+--- a/include/llvm/Config/config.h.cmake
++++ b/include/llvm/Config/config.h.cmake
+@@ -112,9 +112,6 @@
+ /* Define to 1 if you have the <link.h> header file. */
+ #cmakedefine HAVE_LINK_H ${HAVE_LINK_H}
+ 
+-/* Define to 1 if you have the `lseek64' function. */
+-#cmakedefine HAVE_LSEEK64 ${HAVE_LSEEK64}
+-
+ /* Define to 1 if you have the <mach/mach.h> header file. */
+ #cmakedefine HAVE_MACH_MACH_H ${HAVE_MACH_MACH_H}
+ 
+diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
+index 038ad00bd608..921ab8409008 100644
+--- a/lib/Support/raw_ostream.cpp
++++ b/lib/Support/raw_ostream.cpp
+@@ -677,8 +677,6 @@ uint64_t raw_fd_ostream::seek(uint64_t off) {
+   flush();
+ #ifdef _WIN32
+   pos = ::_lseeki64(FD, off, SEEK_SET);
+-#elif defined(HAVE_LSEEK64)
+-  pos = ::lseek64(FD, off, SEEK_SET);
+ #else
+   pos = ::lseek(FD, off, SEEK_SET);
+ #endif
+-- 
+2.37.1
+

llvm/llvm-config-link-static.patch

@@ -0,0 +1,12 @@
+diff --git llvm/tools/llvm-config/CMakeLists.txt llvm/tools/llvm-config/CMakeLists.txt
+index 16ba54c0cf2f..20b017195e84 100644
+--- llvm/tools/llvm-config/CMakeLists.txt
++++ llvm/tools/llvm-config/CMakeLists.txt
+@@ -6,6 +6,7 @@ set(BUILDVARIABLES_OBJPATH ${CMAKE_CURRENT_BINARY_DIR}/BuildVariables.inc)
+ # Add the llvm-config tool.
+ add_llvm_tool(llvm-config
+   llvm-config.cpp
++  DISABLE_LLVM_LINK_LLVM_DYLIB
+   )
+ 
+ # Compute the substitution values for various items.

llvm/multi.nix

@@ -0,0 +1,60 @@
+{ runCommand,
+clang,
+gcc64,
+gcc32,
+glibc_multi
+}:
+
+let
+  combine = basegcc: runCommand "combine-gcc-libc" {} ''
+    mkdir -p $out
+    cp -r ${basegcc.cc}/lib $out/lib
+
+    chmod u+rw -R $out/lib
+    cp -r ${basegcc.libc}/lib/* $(ls -d $out/lib/gcc/*/*)
+  '';
+  gcc_multi_sysroot = runCommand "gcc-multi-sysroot" {
+    passthru = {
+      inherit (gcc64) version;
+      lib = gcc_multi_sysroot;
+    };
+  } ''
+    mkdir -p $out/lib{,64}/gcc
+
+    ln -s ${combine gcc64}/lib/gcc/* $out/lib64/gcc/
+    ln -s ${combine gcc32}/lib/gcc/* $out/lib/gcc/
+    # XXX: This shouldn't be needed, clang just doesn't look for "i686-unknown"
+    ln -s $out/lib/gcc/i686-unknown-linux-gnu $out/lib/gcc/i686-pc-linux-gnu
+
+
+    # includes
+    mkdir -p $out/include
+    ln -s ${glibc_multi.dev}/include/* $out/include
+    ln -s ${gcc64.cc}/include/c++ $out/include/c++
+
+    # dynamic linkers
+    mkdir -p $out/lib/32
+    ln -s ${glibc_multi.out}/lib/ld-linux* $out/lib
+    ln -s ${glibc_multi.out}/lib/32/ld-linux* $out/lib/32/
+  '';
+
+  clangMulti = clang.override {
+    # Only used for providing expected structure re:dynamic linkers, AFAIK Most
+    # of the magic is done by setting the --gcc-toolchain option via
+    # `gccForLibs`.
+    libc = gcc_multi_sysroot;
+
+    bintools = clang.bintools.override {
+      libc = gcc_multi_sysroot;
+    };
+
+    gccForLibs = gcc_multi_sysroot // {
+      inherit (glibc_multi) libgcc;
+      langCC =
+        assert (gcc64.cc.langCC != gcc32.cc.langCC)
+               -> throw "(gcc64.cc.langCC=${gcc64.cc.langCC}) != (gcc32.cc.langCC=${gcc32.cc.langCC})";
+        gcc64.cc.langCC;
+    };
+  };
+
+in clangMulti