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//! Compiles the profiler part of the `compiler-rt` library.
//!
//! See the build.rs for libcompiler_builtins crate for details.
use std::env;
use std::path::Path;
fn main() {
let target = env::var("TARGET").expect("TARGET was not set");
let cfg = &mut cc::Build::new();
// FIXME: `rerun-if-changed` directives are not currently emitted and the build script
// will not rerun on changes in these source files or headers included into them.
let mut profile_sources = vec![
"GCDAProfiling.c",
"InstrProfiling.c",
"InstrProfilingBuffer.c",
"InstrProfilingFile.c",
"InstrProfilingMerge.c",
"InstrProfilingMergeFile.c",
"InstrProfilingNameVar.c",
"InstrProfilingPlatformDarwin.c",
"InstrProfilingPlatformFuchsia.c",
"InstrProfilingPlatformLinux.c",
"InstrProfilingPlatformOther.c",
"InstrProfilingPlatformWindows.c",
"InstrProfilingRuntime.cpp",
"InstrProfilingUtil.c",
"InstrProfilingValue.c",
"InstrProfilingVersionVar.c",
"InstrProfilingWriter.c",
// These files were added in LLVM 11.
"InstrProfilingInternal.c",
"InstrProfilingBiasVar.c",
];
if target.contains("msvc") {
// Don't pull in extra libraries on MSVC
cfg.flag("/Zl");
profile_sources.push("WindowsMMap.c");
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.contains("windows") {
cfg.flag("-fvisibility=hidden");
cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
} else {
profile_sources.push("WindowsMMap.c");
}
}
// 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"));
}
// Note that this should exist if we're going to run (otherwise we just
// don't build profiler builtins at all).
let root = Path::new("../../src/llvm-project/compiler-rt");
let src_root = root.join("lib").join("profile");
for src in profile_sources {
let path = src_root.join(src);
if path.exists() {
cfg.file(path);
}
}
cfg.include(root.join("include"));
cfg.warnings(false);
cfg.compile("profiler-rt");
}
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