5d370bb352
Apparently it doesn't compile due to an odd compiler error! This intrinsic has to do with complex arithmetic anyway and we shouldn't need it.
471 lines
16 KiB
Rust
471 lines
16 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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// 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 as we don't have a libc to
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// provide them.
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if target.contains("wasm32") {
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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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// no C compiler for wasm
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if !target.contains("wasm32") {
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#[cfg(feature = "c")]
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c::compile(&llvm_target);
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println!("cargo:rustc-cfg=use_c");
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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 because that target doesn't have full
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// THUMBv2 support. We have to cfg our code accordingly.
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if llvm_target[0] == "thumbv6m" {
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println!("cargo:rustc-cfg=thumbv6m")
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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::Path;
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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 { map: BTreeMap::new() }
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}
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fn extend(&mut self, sources: &[&'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 &src in sources {
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let symbol = Path::new(src).file_stem().unwrap().to_str().unwrap();
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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 target_arch_arm =
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target_arch.contains("arm") ||
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target_arch.contains("thumb");
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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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// NOTE Most of the ARM intrinsics are written in assembly. Tell gcc which arch we are going
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// to target to make sure that the assembly implementations really work for the target. If
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// the implementation is not valid for the arch, then gcc will error when compiling it.
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if llvm_target[0].starts_with("thumb") {
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cfg.flag("-mthumb");
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}
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if target_arch_arm && llvm_target.last() == Some(&"eabihf") {
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cfg.flag("-mfloat-abi=hard");
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}
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if llvm_target[0] == "thumbv6m" {
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cfg.flag("-march=armv6-m");
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}
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if llvm_target[0] == "thumbv7m" {
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cfg.flag("-march=armv7-m");
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}
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if llvm_target[0] == "thumbv7em" {
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cfg.flag("-march=armv7e-m");
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}
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let mut sources = Sources::new();
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sources.extend(
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&[
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"absvdi2.c",
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"absvsi2.c",
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"addvdi3.c",
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"addvsi3.c",
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"apple_versioning.c",
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"clzdi2.c",
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"clzsi2.c",
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"cmpdi2.c",
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"ctzdi2.c",
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"ctzsi2.c",
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"divdc3.c",
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"divsc3.c",
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"divxc3.c",
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"extendhfsf2.c",
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"int_util.c",
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"muldc3.c",
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"mulsc3.c",
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"mulvdi3.c",
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"mulvsi3.c",
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"mulxc3.c",
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"negdf2.c",
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"negdi2.c",
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"negsf2.c",
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"negvdi2.c",
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"negvsi2.c",
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"paritydi2.c",
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"paritysi2.c",
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"popcountdi2.c",
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"popcountsi2.c",
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"powixf2.c",
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"subvdi3.c",
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"subvsi3.c",
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"truncdfhf2.c",
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"truncdfsf2.c",
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"truncsfhf2.c",
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"ucmpdi2.c",
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],
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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(&[
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"ffsdi2.c",
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]);
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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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&[
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"absvti2.c",
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"addvti3.c",
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"clzti2.c",
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"cmpti2.c",
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"ctzti2.c",
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"ffsti2.c",
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"mulvti3.c",
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"negti2.c",
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"negvti2.c",
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"parityti2.c",
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"popcountti2.c",
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"subvti3.c",
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"ucmpti2.c",
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],
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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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&[
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"atomic_flag_clear.c",
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"atomic_flag_clear_explicit.c",
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"atomic_flag_test_and_set.c",
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"atomic_flag_test_and_set_explicit.c",
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"atomic_signal_fence.c",
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"atomic_thread_fence.c",
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],
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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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&[
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"x86_64/floatdisf.c",
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"x86_64/floatdixf.c",
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],
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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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&[
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"x86_64/floatdisf.c",
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"x86_64/floatdixf.c",
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"x86_64/floatundidf.S",
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"x86_64/floatundisf.S",
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"x86_64/floatundixf.S",
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],
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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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&[
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"i386/ashldi3.S",
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"i386/ashrdi3.S",
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"i386/divdi3.S",
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"i386/floatdidf.S",
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"i386/floatdisf.S",
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"i386/floatdixf.S",
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"i386/floatundidf.S",
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"i386/floatundisf.S",
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"i386/floatundixf.S",
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"i386/lshrdi3.S",
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"i386/moddi3.S",
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"i386/muldi3.S",
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"i386/udivdi3.S",
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"i386/umoddi3.S",
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],
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);
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}
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}
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if target_arch == "arm" && target_os != "ios" {
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sources.extend(
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&[
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"arm/aeabi_div0.c",
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"arm/aeabi_drsub.c",
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"arm/aeabi_frsub.c",
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"arm/bswapdi2.S",
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"arm/bswapsi2.S",
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"arm/clzdi2.S",
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"arm/clzsi2.S",
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"arm/divmodsi4.S",
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"arm/modsi3.S",
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"arm/switch16.S",
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"arm/switch32.S",
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"arm/switch8.S",
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"arm/switchu8.S",
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"arm/sync_synchronize.S",
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"arm/udivmodsi4.S",
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"arm/umodsi3.S",
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// Exclude these two files for now even though we haven't
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// translated their implementation into Rust yet (#173).
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// They appear... buggy? The `udivsi3` implementation was
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// the one that seemed buggy, but the `divsi3` file
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// references a symbol from `udivsi3` so we compile them
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// both with the Rust versions.
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//
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// Note that if these are added back they should be removed
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// from thumbv6m below.
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//
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// "arm/divsi3.S",
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// "arm/udivsi3.S",
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],
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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") &&
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!llvm_target[0].starts_with("armeb") {
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sources.extend(
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&[
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"arm/aeabi_cdcmp.S",
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"arm/aeabi_cdcmpeq_check_nan.c",
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"arm/aeabi_cfcmp.S",
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"arm/aeabi_cfcmpeq_check_nan.c",
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],
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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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&[
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"arm/sync_fetch_and_add_4.S",
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"arm/sync_fetch_and_add_8.S",
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"arm/sync_fetch_and_and_4.S",
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"arm/sync_fetch_and_and_8.S",
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"arm/sync_fetch_and_max_4.S",
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"arm/sync_fetch_and_max_8.S",
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"arm/sync_fetch_and_min_4.S",
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"arm/sync_fetch_and_min_8.S",
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"arm/sync_fetch_and_nand_4.S",
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"arm/sync_fetch_and_nand_8.S",
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"arm/sync_fetch_and_or_4.S",
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"arm/sync_fetch_and_or_8.S",
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"arm/sync_fetch_and_sub_4.S",
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"arm/sync_fetch_and_sub_8.S",
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"arm/sync_fetch_and_umax_4.S",
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"arm/sync_fetch_and_umax_8.S",
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"arm/sync_fetch_and_umin_4.S",
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"arm/sync_fetch_and_umin_8.S",
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"arm/sync_fetch_and_xor_4.S",
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"arm/sync_fetch_and_xor_8.S",
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],
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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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sources.extend(
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&[
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"arm/fixdfsivfp.S",
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"arm/fixsfsivfp.S",
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"arm/fixunsdfsivfp.S",
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"arm/fixunssfsivfp.S",
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"arm/floatsidfvfp.S",
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"arm/floatsisfvfp.S",
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"arm/floatunssidfvfp.S",
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"arm/floatunssisfvfp.S",
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"arm/restore_vfp_d8_d15_regs.S",
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"arm/save_vfp_d8_d15_regs.S",
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],
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);
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}
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sources.extend(&["arm/negdf2vfp.S", "arm/negsf2vfp.S"]);
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}
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if target_arch == "aarch64" {
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sources.extend(
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&[
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"comparetf2.c",
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"extenddftf2.c",
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"extendsftf2.c",
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"fixtfdi.c",
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"fixtfsi.c",
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"fixtfti.c",
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"fixunstfdi.c",
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"fixunstfsi.c",
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"fixunstfti.c",
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"floatditf.c",
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"floatsitf.c",
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"floatunditf.c",
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"floatunsitf.c",
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"trunctfdf2.c",
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"trunctfsf2.c",
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],
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);
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if target_os != "windows" {
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sources.extend(&["multc3.c"]);
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}
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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" {
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sources.remove(
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&[
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"clzdi2",
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"clzsi2",
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"divmodsi4",
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"modsi3",
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"switch16",
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"switch32",
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"switch8",
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"switchu8",
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"udivmodsi4",
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"umodsi3",
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],
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);
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// But use some generic implementations where possible
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sources.extend(&["clzdi2.c", "clzsi2.c"])
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}
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|
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if llvm_target[0] == "thumbv7m" || llvm_target[0] == "thumbv7em" {
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sources.remove(&["aeabi_cdcmp", "aeabi_cfcmp"]);
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}
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|
|
// When compiling in rustbuild (the rust-lang/rust repo) this build
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|
// script runs from a directory other than this root directory.
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|
let root = if cfg!(feature = "rustbuild") {
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Path::new("../../libcompiler_builtins")
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} else {
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|
Path::new(".")
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};
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|
|
let src_dir = root.join("compiler-rt/lib/builtins");
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|
for src in sources.map.values() {
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let src = src_dir.join(src);
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cfg.file(&src);
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|
println!("cargo:rerun-if-changed={}", src.display());
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}
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cfg.compile("libcompiler-rt.a");
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}
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|
}
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