1 //! Compiles the profiler part of the `compiler-rt` library.
3 //! See the build.rs for libcompiler_builtins crate for details.
9 let target = env::var("TARGET").expect("TARGET was not set");
10 let cfg = &mut cc::Build::new();
12 // FIXME: `rerun-if-changed` directives are not currently emitted and the build script
13 // will not rerun on changes in these source files or headers included into them.
14 let mut profile_sources = vec![
17 "InstrProfilingBuffer.c",
18 "InstrProfilingFile.c",
19 "InstrProfilingMerge.c",
20 "InstrProfilingMergeFile.c",
21 "InstrProfilingNameVar.c",
22 "InstrProfilingPlatformDarwin.c",
23 "InstrProfilingPlatformFuchsia.c",
24 "InstrProfilingPlatformLinux.c",
25 "InstrProfilingPlatformOther.c",
26 "InstrProfilingPlatformWindows.c",
27 "InstrProfilingRuntime.cpp",
28 "InstrProfilingUtil.c",
29 "InstrProfilingValue.c",
30 "InstrProfilingVersionVar.c",
31 "InstrProfilingWriter.c",
32 // These files were added in LLVM 11.
33 "InstrProfilingInternal.c",
34 "InstrProfilingBiasVar.c",
37 if target.contains("msvc") {
38 // Don't pull in extra libraries on MSVC
40 profile_sources.push("WindowsMMap.c");
41 cfg.define("strdup", Some("_strdup"));
42 cfg.define("open", Some("_open"));
43 cfg.define("fdopen", Some("_fdopen"));
44 cfg.define("getpid", Some("_getpid"));
45 cfg.define("fileno", Some("_fileno"));
47 // Turn off various features of gcc and such, mostly copying
48 // compiler-rt's build system already
49 cfg.flag("-fno-builtin");
50 cfg.flag("-fomit-frame-pointer");
51 cfg.define("VISIBILITY_HIDDEN", None);
52 if !target.contains("windows") {
53 cfg.flag("-fvisibility=hidden");
54 cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
56 profile_sources.push("WindowsMMap.c");
60 // Assume that the Unixes we are building this for have fnctl() available
61 if env::var_os("CARGO_CFG_UNIX").is_some() {
62 cfg.define("COMPILER_RT_HAS_FCNTL_LCK", Some("1"));
65 // This should be a pretty good heuristic for when to set
66 // COMPILER_RT_HAS_ATOMICS
67 if env::var_os("CARGO_CFG_TARGET_HAS_ATOMIC")
68 .map(|features| features.to_string_lossy().to_lowercase().contains("ptr"))
71 cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
74 // Note that this should exist if we're going to run (otherwise we just
75 // don't build profiler builtins at all).
76 let root = Path::new("../../src/llvm-project/compiler-rt");
78 let src_root = root.join("lib").join("profile");
79 for src in profile_sources {
80 let path = src_root.join(src);
86 cfg.include(root.join("include"));
88 cfg.compile("profiler-rt");