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|
//! Compiles the profiler part of the `compiler-rt` library.
//!
//! Loosely based on:
//! - LLVM's `compiler-rt/lib/profile/CMakeLists.txt`
//! - <https://github.com/rust-lang/compiler-builtins/blob/master/build.rs>.
use std::env;
use std::path::PathBuf;
fn main() {
if let Ok(rt) = tracked_env_var("LLVM_PROFILER_RT_LIB") {
let rt = PathBuf::from(rt);
if let Some(lib) = rt.file_name() {
if let Some(dir) = rt.parent() {
println!("cargo::rustc-link-search=native={}", dir.display());
}
println!("cargo::rustc-link-lib=static:+verbatim={}", lib.to_str().unwrap());
return;
}
}
let target_os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS was not set");
let target_env = env::var("CARGO_CFG_TARGET_ENV").expect("CARGO_CFG_TARGET_ENV was not set");
let cfg = &mut cc::Build::new();
let profile_sources = vec![
// tidy-alphabetical-start
"GCDAProfiling.c",
"InstrProfiling.c",
"InstrProfilingBuffer.c",
"InstrProfilingFile.c",
"InstrProfilingInternal.c",
"InstrProfilingMerge.c",
"InstrProfilingMergeFile.c",
"InstrProfilingNameVar.c",
"InstrProfilingPlatformAIX.c",
"InstrProfilingPlatformDarwin.c",
"InstrProfilingPlatformFuchsia.c",
"InstrProfilingPlatformLinux.c",
"InstrProfilingPlatformOther.c",
"InstrProfilingPlatformWindows.c",
"InstrProfilingRuntime.cpp",
"InstrProfilingUtil.c",
"InstrProfilingValue.c",
"InstrProfilingVersionVar.c",
"InstrProfilingWriter.c",
"WindowsMMap.c",
// tidy-alphabetical-end
];
if target_env == "msvc" {
// Don't pull in extra libraries on MSVC
cfg.flag("/Zl");
cfg.define("strdup", Some("_strdup"));
cfg.define("open", Some("_open"));
cfg.define("fdopen", Some("_fdopen"));
cfg.define("getpid", Some("_getpid"));
cfg.define("fileno", Some("_fileno"));
} else {
// Turn off various features of gcc and such, mostly copying
// compiler-rt's build system already
cfg.flag("-fno-builtin");
cfg.flag("-fomit-frame-pointer");
cfg.define("VISIBILITY_HIDDEN", None);
if target_os != "windows" {
cfg.flag("-fvisibility=hidden");
cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
}
}
// Assume that the Unixes we are building this for have fnctl() available
if env::var_os("CARGO_CFG_UNIX").is_some() {
cfg.define("COMPILER_RT_HAS_FCNTL_LCK", Some("1"));
}
// This should be a pretty good heuristic for when to set
// COMPILER_RT_HAS_ATOMICS
if env::var_os("CARGO_CFG_TARGET_HAS_ATOMIC")
.map(|features| features.to_string_lossy().to_lowercase().contains("ptr"))
.unwrap_or(false)
{
cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
}
// Get the LLVM `compiler-rt` directory from bootstrap.
let root = PathBuf::from(tracked_env_var_or_fallback(
"RUST_COMPILER_RT_FOR_PROFILER",
"../../src/llvm-project/compiler-rt",
));
let src_root = root.join("lib").join("profile");
assert!(src_root.exists(), "profiler runtime source directory not found: {src_root:?}");
println!("cargo::rerun-if-changed={}", src_root.display());
for file in profile_sources {
cfg.file(src_root.join(file));
}
let include = root.join("include");
println!("cargo::rerun-if-changed={}", include.display());
cfg.include(include);
cfg.warnings(false);
cfg.compile("profiler-rt");
}
fn tracked_env_var(key: &str) -> Result<String, env::VarError> {
println!("cargo::rerun-if-env-changed={key}");
env::var(key)
}
fn tracked_env_var_or_fallback(key: &str, fallback: &str) -> String {
tracked_env_var(key).unwrap_or_else(|_| {
println!("cargo::warning={key} was not set; falling back to {fallback:?}");
fallback.to_owned()
})
}
|
