445 lines
19 KiB
Rust
445 lines
19 KiB
Rust
use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let target = env::var("TARGET").unwrap();
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let cwd = env::current_dir().unwrap();
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println!("cargo:compiler-rt={}", cwd.join("compiler-rt").display());
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// Activate libm's unstable features to make full use of Nightly.
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println!("cargo:rustc-cfg=feature=\"unstable\"");
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// Emscripten's runtime includes all the builtins
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if target.contains("emscripten") {
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return;
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}
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// OpenBSD provides compiler_rt by default, use it instead of rebuilding it from source
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if target.contains("openbsd") {
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println!("cargo:rustc-link-search=native=/usr/lib");
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println!("cargo:rustc-link-lib=compiler_rt");
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return;
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}
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// Forcibly enable memory intrinsics on wasm32 & SGX as we don't have a libc to
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// provide them.
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if (target.contains("wasm32") && !target.contains("wasi"))
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|| (target.contains("sgx") && target.contains("fortanix"))
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{
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println!("cargo:rustc-cfg=feature=\"mem\"");
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}
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// NOTE we are going to assume that llvm-target, what determines our codegen option, matches the
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// target triple. This is usually correct for our built-in targets but can break in presence of
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// custom targets, which can have arbitrary names.
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let llvm_target = target.split('-').collect::<Vec<_>>();
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// Build missing intrinsics from compiler-rt C source code. If we're
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// mangling names though we assume that we're also in test mode so we don't
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// build anything and we rely on the upstream implementation of compiler-rt
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// functions
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if !cfg!(feature = "mangled-names") && cfg!(feature = "c") {
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// Don't use a C compiler for these targets:
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//
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// * wasm32 - clang 8 for wasm is somewhat hard to come by and it's
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// unlikely that the C is really that much better than our own Rust.
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// * nvptx - everything is bitcode, not compatible with mixed C/Rust
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// * riscv - the rust-lang/rust distribution container doesn't have a C
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// compiler nor is cc-rs ready for compilation to riscv (at this
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// time). This can probably be removed in the future
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if !target.contains("wasm32") && !target.contains("nvptx") && !target.starts_with("riscv") {
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#[cfg(feature = "c")]
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c::compile(&llvm_target);
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}
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}
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// To compile intrinsics.rs for thumb targets, where there is no libc
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if llvm_target[0].starts_with("thumb") {
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println!("cargo:rustc-cfg=thumb")
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}
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// compiler-rt `cfg`s away some intrinsics for thumbv6m and thumbv8m.base because
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// these targets do not have full Thumb-2 support but only original Thumb-1.
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// We have to cfg our code accordingly.
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if llvm_target[0] == "thumbv6m" || llvm_target[0] == "thumbv8m.base" {
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println!("cargo:rustc-cfg=thumb_1")
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}
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// Only emit the ARM Linux atomic emulation on pre-ARMv6 architectures.
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if llvm_target[0] == "armv4t" || llvm_target[0] == "armv5te" {
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println!("cargo:rustc-cfg=kernel_user_helpers")
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}
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}
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#[cfg(feature = "c")]
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mod c {
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extern crate cc;
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use std::collections::BTreeMap;
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use std::env;
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use std::path::PathBuf;
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struct Sources {
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// SYMBOL -> PATH TO SOURCE
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map: BTreeMap<&'static str, &'static str>,
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}
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impl Sources {
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fn new() -> Sources {
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Sources {
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map: BTreeMap::new(),
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}
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}
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fn extend(&mut self, sources: &[(&'static str, &'static str)]) {
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// NOTE Some intrinsics have both a generic implementation (e.g.
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// `floatdidf.c`) and an arch optimized implementation
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// (`x86_64/floatdidf.c`). In those cases, we keep the arch optimized
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// implementation and discard the generic implementation. If we don't
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// and keep both implementations, the linker will yell at us about
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// duplicate symbols!
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for (symbol, src) in sources {
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if src.contains("/") {
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// Arch-optimized implementation (preferred)
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self.map.insert(symbol, src);
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} else {
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// Generic implementation
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if !self.map.contains_key(symbol) {
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self.map.insert(symbol, src);
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}
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}
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}
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}
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fn remove(&mut self, symbols: &[&str]) {
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for symbol in symbols {
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self.map.remove(*symbol).unwrap();
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}
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}
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}
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/// Compile intrinsics from the compiler-rt C source code
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pub fn compile(llvm_target: &[&str]) {
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let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
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let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
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let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
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let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
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let cfg = &mut cc::Build::new();
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cfg.warnings(false);
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if target_env == "msvc" {
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// Don't pull in extra libraries on MSVC
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cfg.flag("/Zl");
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// Emulate C99 and C++11's __func__ for MSVC prior to 2013 CTP
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cfg.define("__func__", Some("__FUNCTION__"));
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} else {
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// Turn off various features of gcc and such, mostly copying
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// compiler-rt's build system already
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cfg.flag("-fno-builtin");
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cfg.flag("-fvisibility=hidden");
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cfg.flag("-ffreestanding");
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// Avoid the following warning appearing once **per file**:
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// clang: warning: optimization flag '-fomit-frame-pointer' is not supported for target 'armv7' [-Wignored-optimization-argument]
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//
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// Note that compiler-rt's build system also checks
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//
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// `check_cxx_compiler_flag(-fomit-frame-pointer COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG)`
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//
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// in https://github.com/rust-lang/compiler-rt/blob/c8fbcb3/cmake/config-ix.cmake#L19.
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cfg.flag_if_supported("-fomit-frame-pointer");
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cfg.define("VISIBILITY_HIDDEN", None);
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}
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let mut sources = Sources::new();
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sources.extend(&[
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("__absvdi2", "absvdi2.c"),
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("__absvsi2", "absvsi2.c"),
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("__addvdi3", "addvdi3.c"),
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("__addvsi3", "addvsi3.c"),
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("apple_versioning", "apple_versioning.c"),
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("__clzdi2", "clzdi2.c"),
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("__clzsi2", "clzsi2.c"),
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("__cmpdi2", "cmpdi2.c"),
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("__ctzdi2", "ctzdi2.c"),
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("__ctzsi2", "ctzsi2.c"),
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("__divdc3", "divdc3.c"),
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("__divsc3", "divsc3.c"),
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("__divxc3", "divxc3.c"),
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("__extendhfsf2", "extendhfsf2.c"),
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("__int_util", "int_util.c"),
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("__muldc3", "muldc3.c"),
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("__mulsc3", "mulsc3.c"),
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("__mulvdi3", "mulvdi3.c"),
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("__mulvsi3", "mulvsi3.c"),
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("__mulxc3", "mulxc3.c"),
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("__negdf2", "negdf2.c"),
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("__negdi2", "negdi2.c"),
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("__negsf2", "negsf2.c"),
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("__negvdi2", "negvdi2.c"),
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("__negvsi2", "negvsi2.c"),
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("__paritydi2", "paritydi2.c"),
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("__paritysi2", "paritysi2.c"),
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("__popcountdi2", "popcountdi2.c"),
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("__popcountsi2", "popcountsi2.c"),
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("__powixf2", "powixf2.c"),
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("__subvdi3", "subvdi3.c"),
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("__subvsi3", "subvsi3.c"),
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("__truncdfhf2", "truncdfhf2.c"),
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("__truncdfsf2", "truncdfsf2.c"),
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("__truncsfhf2", "truncsfhf2.c"),
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("__ucmpdi2", "ucmpdi2.c"),
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]);
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// When compiling in rustbuild (the rust-lang/rust repo) this library
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// also needs to satisfy intrinsics that jemalloc or C in general may
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// need, so include a few more that aren't typically needed by
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// LLVM/Rust.
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if cfg!(feature = "rustbuild") {
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sources.extend(&[("__ffsdi2", "ffsdi2.c")]);
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}
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// On iOS and 32-bit OSX these are all just empty intrinsics, no need to
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// include them.
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if target_os != "ios" && (target_vendor != "apple" || target_arch != "x86") {
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sources.extend(&[
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("__absvti2", "absvti2.c"),
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("__addvti3", "addvti3.c"),
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("__clzti2", "clzti2.c"),
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("__cmpti2", "cmpti2.c"),
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("__ctzti2", "ctzti2.c"),
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("__ffsti2", "ffsti2.c"),
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("__mulvti3", "mulvti3.c"),
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("__negti2", "negti2.c"),
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("__negvti2", "negvti2.c"),
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("__parityti2", "parityti2.c"),
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("__popcountti2", "popcountti2.c"),
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("__subvti3", "subvti3.c"),
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("__ucmpti2", "ucmpti2.c"),
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]);
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}
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if target_vendor == "apple" {
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sources.extend(&[
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("atomic_flag_clear", "atomic_flag_clear.c"),
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("atomic_flag_clear_explicit", "atomic_flag_clear_explicit.c"),
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("atomic_flag_test_and_set", "atomic_flag_test_and_set.c"),
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(
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"atomic_flag_test_and_set_explicit",
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"atomic_flag_test_and_set_explicit.c",
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),
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("atomic_signal_fence", "atomic_signal_fence.c"),
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("atomic_thread_fence", "atomic_thread_fence.c"),
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]);
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}
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if target_env == "msvc" {
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if target_arch == "x86_64" {
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sources.extend(&[
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("__floatdisf", "x86_64/floatdisf.c"),
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("__floatdixf", "x86_64/floatdixf.c"),
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]);
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}
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} else {
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// None of these seem to be used on x86_64 windows, and they've all
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// got the wrong ABI anyway, so we want to avoid them.
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if target_os != "windows" {
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if target_arch == "x86_64" {
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sources.extend(&[
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("__floatdisf", "x86_64/floatdisf.c"),
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("__floatdixf", "x86_64/floatdixf.c"),
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("__floatundidf", "x86_64/floatundidf.S"),
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("__floatundisf", "x86_64/floatundisf.S"),
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("__floatundixf", "x86_64/floatundixf.S"),
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]);
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}
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}
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if target_arch == "x86" {
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sources.extend(&[
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("__ashldi3", "i386/ashldi3.S"),
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("__ashrdi3", "i386/ashrdi3.S"),
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("__divdi3", "i386/divdi3.S"),
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("__floatdidf", "i386/floatdidf.S"),
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("__floatdisf", "i386/floatdisf.S"),
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("__floatdixf", "i386/floatdixf.S"),
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("__floatundidf", "i386/floatundidf.S"),
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("__floatundisf", "i386/floatundisf.S"),
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("__floatundixf", "i386/floatundixf.S"),
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("__lshrdi3", "i386/lshrdi3.S"),
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("__moddi3", "i386/moddi3.S"),
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("__muldi3", "i386/muldi3.S"),
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("__udivdi3", "i386/udivdi3.S"),
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("__umoddi3", "i386/umoddi3.S"),
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]);
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}
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}
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if target_arch == "arm" && target_os != "ios" && target_env != "msvc" {
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sources.extend(&[
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("__aeabi_div0", "arm/aeabi_div0.c"),
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("__aeabi_drsub", "arm/aeabi_drsub.c"),
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("__aeabi_frsub", "arm/aeabi_frsub.c"),
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("__bswapdi2", "arm/bswapdi2.S"),
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("__bswapsi2", "arm/bswapsi2.S"),
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("__clzdi2", "arm/clzdi2.S"),
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("__clzsi2", "arm/clzsi2.S"),
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("__divmodsi4", "arm/divmodsi4.S"),
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("__divsi3", "arm/divsi3.S"),
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("__modsi3", "arm/modsi3.S"),
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("__switch16", "arm/switch16.S"),
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("__switch32", "arm/switch32.S"),
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("__switch8", "arm/switch8.S"),
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("__switchu8", "arm/switchu8.S"),
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("__sync_synchronize", "arm/sync_synchronize.S"),
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("__udivmodsi4", "arm/udivmodsi4.S"),
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("__udivsi3", "arm/udivsi3.S"),
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("__umodsi3", "arm/umodsi3.S"),
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]);
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if target_os == "freebsd" {
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sources.extend(&[("__clear_cache", "clear_cache.c")]);
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}
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// First of all aeabi_cdcmp and aeabi_cfcmp are never called by LLVM.
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// Second are little-endian only, so build fail on big-endian targets.
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// Temporally workaround: exclude these files for big-endian targets.
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if !llvm_target[0].starts_with("thumbeb") && !llvm_target[0].starts_with("armeb") {
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sources.extend(&[
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("__aeabi_cdcmp", "arm/aeabi_cdcmp.S"),
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("__aeabi_cdcmpeq_check_nan", "arm/aeabi_cdcmpeq_check_nan.c"),
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("__aeabi_cfcmp", "arm/aeabi_cfcmp.S"),
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("__aeabi_cfcmpeq_check_nan", "arm/aeabi_cfcmpeq_check_nan.c"),
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]);
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}
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}
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if llvm_target[0] == "armv7" {
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sources.extend(&[
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("__sync_fetch_and_add_4", "arm/sync_fetch_and_add_4.S"),
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("__sync_fetch_and_add_8", "arm/sync_fetch_and_add_8.S"),
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("__sync_fetch_and_and_4", "arm/sync_fetch_and_and_4.S"),
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("__sync_fetch_and_and_8", "arm/sync_fetch_and_and_8.S"),
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("__sync_fetch_and_max_4", "arm/sync_fetch_and_max_4.S"),
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("__sync_fetch_and_max_8", "arm/sync_fetch_and_max_8.S"),
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("__sync_fetch_and_min_4", "arm/sync_fetch_and_min_4.S"),
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("__sync_fetch_and_min_8", "arm/sync_fetch_and_min_8.S"),
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("__sync_fetch_and_nand_4", "arm/sync_fetch_and_nand_4.S"),
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("__sync_fetch_and_nand_8", "arm/sync_fetch_and_nand_8.S"),
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("__sync_fetch_and_or_4", "arm/sync_fetch_and_or_4.S"),
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("__sync_fetch_and_or_8", "arm/sync_fetch_and_or_8.S"),
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("__sync_fetch_and_sub_4", "arm/sync_fetch_and_sub_4.S"),
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("__sync_fetch_and_sub_8", "arm/sync_fetch_and_sub_8.S"),
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("__sync_fetch_and_umax_4", "arm/sync_fetch_and_umax_4.S"),
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("__sync_fetch_and_umax_8", "arm/sync_fetch_and_umax_8.S"),
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("__sync_fetch_and_umin_4", "arm/sync_fetch_and_umin_4.S"),
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("__sync_fetch_and_umin_8", "arm/sync_fetch_and_umin_8.S"),
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("__sync_fetch_and_xor_4", "arm/sync_fetch_and_xor_4.S"),
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("__sync_fetch_and_xor_8", "arm/sync_fetch_and_xor_8.S"),
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]);
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}
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if llvm_target.last().unwrap().ends_with("eabihf") {
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if !llvm_target[0].starts_with("thumbv7em")
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&& !llvm_target[0].starts_with("thumbv8m.main")
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{
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// The FPU option chosen for these architectures in cc-rs, ie:
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// -mfpu=fpv4-sp-d16 for thumbv7em
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// -mfpu=fpv5-sp-d16 for thumbv8m.main
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// do not support double precision floating points conversions so the files
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// that include such instructions are not included for these targets.
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sources.extend(&[
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("__fixdfsivfp", "arm/fixdfsivfp.S"),
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("__fixunsdfsivfp", "arm/fixunsdfsivfp.S"),
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("__floatsidfvfp", "arm/floatsidfvfp.S"),
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("__floatunssidfvfp", "arm/floatunssidfvfp.S"),
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]);
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}
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sources.extend(&[
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("__fixsfsivfp", "arm/fixsfsivfp.S"),
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("__fixunssfsivfp", "arm/fixunssfsivfp.S"),
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("__floatsisfvfp", "arm/floatsisfvfp.S"),
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("__floatunssisfvfp", "arm/floatunssisfvfp.S"),
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("__floatunssisfvfp", "arm/floatunssisfvfp.S"),
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("__restore_vfp_d8_d15_regs", "arm/restore_vfp_d8_d15_regs.S"),
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("__save_vfp_d8_d15_regs", "arm/save_vfp_d8_d15_regs.S"),
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("__negdf2vfp", "arm/negdf2vfp.S"),
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("__negsf2vfp", "arm/negsf2vfp.S"),
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]);
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}
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if target_arch == "aarch64" {
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sources.extend(&[
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("__comparetf2", "comparetf2.c"),
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("__extenddftf2", "extenddftf2.c"),
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("__extendsftf2", "extendsftf2.c"),
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("__fixtfdi", "fixtfdi.c"),
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("__fixtfsi", "fixtfsi.c"),
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("__fixtfti", "fixtfti.c"),
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("__fixunstfdi", "fixunstfdi.c"),
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("__fixunstfsi", "fixunstfsi.c"),
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("__fixunstfti", "fixunstfti.c"),
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("__floatditf", "floatditf.c"),
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("__floatsitf", "floatsitf.c"),
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("__floatunditf", "floatunditf.c"),
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("__floatunsitf", "floatunsitf.c"),
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("__trunctfdf2", "trunctfdf2.c"),
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("__trunctfsf2", "trunctfsf2.c"),
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]);
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if target_os != "windows" {
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sources.extend(&[("__multc3", "multc3.c")]);
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}
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}
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// Remove the assembly implementations that won't compile for the target
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if llvm_target[0] == "thumbv6m" || llvm_target[0] == "thumbv8m.base" {
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let mut to_remove = Vec::new();
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for (k, v) in sources.map.iter() {
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if v.ends_with(".S") {
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to_remove.push(*k);
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}
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}
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sources.remove(&to_remove);
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// But use some generic implementations where possible
|
|
sources.extend(&[("__clzdi2", "clzdi2.c"), ("__clzsi2", "clzsi2.c")])
|
|
}
|
|
|
|
if llvm_target[0] == "thumbv7m" || llvm_target[0] == "thumbv7em" {
|
|
sources.remove(&["__aeabi_cdcmp", "__aeabi_cfcmp"]);
|
|
}
|
|
|
|
// When compiling the C code we require the user to tell us where the
|
|
// source code is, and this is largely done so when we're compiling as
|
|
// part of rust-lang/rust we can use the same llvm-project repository as
|
|
// rust-lang/rust.
|
|
let root = match env::var_os("RUST_COMPILER_RT_ROOT") {
|
|
Some(s) => PathBuf::from(s),
|
|
None => panic!("RUST_COMPILER_RT_ROOT is not set"),
|
|
};
|
|
if !root.exists() {
|
|
panic!("RUST_COMPILER_RT_ROOT={} does not exist", root.display());
|
|
}
|
|
|
|
// Support deterministic builds by remapping the __FILE__ prefix if the
|
|
// compiler supports it. This fixes the nondeterminism caused by the
|
|
// use of that macro in lib/builtins/int_util.h in compiler-rt.
|
|
cfg.flag_if_supported(&format!("-ffile-prefix-map={}=.", root.display()));
|
|
|
|
let src_dir = root.join("lib/builtins");
|
|
for (sym, src) in sources.map.iter() {
|
|
let src = src_dir.join(src);
|
|
cfg.file(&src);
|
|
println!("cargo:rerun-if-changed={}", src.display());
|
|
println!("cargo:rustc-cfg={}=\"optimized-c\"", sym);
|
|
}
|
|
|
|
cfg.compile("libcompiler-rt.a");
|
|
}
|
|
}
|