1ecb08409d
Currently, when building with `build-std`, some library build scripts check properties of the target by inspecting the target triple at `env::TARGET`, which is simply set to the filename of the JSON file when using JSON target files. This patch alters these build scripts to use `env::CARGO_CFG_*` to fetch target information instead, allowing JSON target files describing platforms without `restricted_std` to build correctly when using `-Z build-std`. Fixes wg-cargo-std-aware/#60.
97 lines
3.3 KiB
Rust
97 lines
3.3 KiB
Rust
//! Compiles the profiler part of the `compiler-rt` library.
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//!
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//! See the build.rs for libcompiler_builtins crate for details.
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use std::env;
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use std::path::Path;
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fn main() {
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println!("cargo:rerun-if-env-changed=LLVM_PROFILER_RT_LIB");
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if let Ok(rt) = env::var("LLVM_PROFILER_RT_LIB") {
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println!("cargo:rustc-link-lib=static:+verbatim={rt}");
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return;
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}
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let target_os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS was not set");
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let target_env = env::var("CARGO_CFG_TARGET_ENV").expect("CARGO_CFG_TARGET_ENV was not set");
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let cfg = &mut cc::Build::new();
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// FIXME: `rerun-if-changed` directives are not currently emitted and the build script
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// will not rerun on changes in these source files or headers included into them.
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let mut profile_sources = vec![
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"GCDAProfiling.c",
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"InstrProfiling.c",
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"InstrProfilingBuffer.c",
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"InstrProfilingFile.c",
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"InstrProfilingMerge.c",
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"InstrProfilingMergeFile.c",
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"InstrProfilingNameVar.c",
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"InstrProfilingPlatformDarwin.c",
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"InstrProfilingPlatformFuchsia.c",
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"InstrProfilingPlatformLinux.c",
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"InstrProfilingPlatformOther.c",
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"InstrProfilingPlatformWindows.c",
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"InstrProfilingRuntime.cpp",
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"InstrProfilingUtil.c",
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"InstrProfilingValue.c",
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"InstrProfilingVersionVar.c",
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"InstrProfilingWriter.c",
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// These files were added in LLVM 11.
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"InstrProfilingInternal.c",
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"InstrProfilingBiasVar.c",
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];
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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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profile_sources.push("WindowsMMap.c");
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cfg.define("strdup", Some("_strdup"));
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cfg.define("open", Some("_open"));
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cfg.define("fdopen", Some("_fdopen"));
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cfg.define("getpid", Some("_getpid"));
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cfg.define("fileno", Some("_fileno"));
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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("-fomit-frame-pointer");
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cfg.define("VISIBILITY_HIDDEN", None);
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if target_os != "windows" {
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cfg.flag("-fvisibility=hidden");
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cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
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} else {
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profile_sources.push("WindowsMMap.c");
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}
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}
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// Assume that the Unixes we are building this for have fnctl() available
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if env::var_os("CARGO_CFG_UNIX").is_some() {
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cfg.define("COMPILER_RT_HAS_FCNTL_LCK", Some("1"));
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}
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// This should be a pretty good heuristic for when to set
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// COMPILER_RT_HAS_ATOMICS
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if env::var_os("CARGO_CFG_TARGET_HAS_ATOMIC")
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.map(|features| features.to_string_lossy().to_lowercase().contains("ptr"))
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.unwrap_or(false)
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{
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cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
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}
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// Note that this should exist if we're going to run (otherwise we just
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// don't build profiler builtins at all).
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let root = Path::new("../../src/llvm-project/compiler-rt");
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let src_root = root.join("lib").join("profile");
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for src in profile_sources {
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let path = src_root.join(src);
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if path.exists() {
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cfg.file(path);
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}
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}
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cfg.include(root.join("include"));
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cfg.warnings(false);
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cfg.compile("profiler-rt");
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}
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