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 "InstrProfilingUtil.c",
28 "InstrProfilingValue.c",
29 "InstrProfilingVersionVar.c",
30 "InstrProfilingWriter.c",
31 // This file was renamed in LLVM 10.
32 "InstrProfilingRuntime.cc",
33 "InstrProfilingRuntime.cpp",
34 // These files were added in LLVM 11.
35 "InstrProfilingInternal.c",
36 "InstrProfilingBiasVar.c",
39 if target.contains("msvc") {
40 // Don't pull in extra libraries on MSVC
42 profile_sources.push("WindowsMMap.c");
43 cfg.define("strdup", Some("_strdup"));
44 cfg.define("open", Some("_open"));
45 cfg.define("fdopen", Some("_fdopen"));
46 cfg.define("getpid", Some("_getpid"));
47 cfg.define("fileno", Some("_fileno"));
49 // Turn off various features of gcc and such, mostly copying
50 // compiler-rt's build system already
51 cfg.flag("-fno-builtin");
52 cfg.flag("-fomit-frame-pointer");
53 cfg.define("VISIBILITY_HIDDEN", None);
54 if !target.contains("windows") {
55 cfg.flag("-fvisibility=hidden");
56 cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
58 profile_sources.push("WindowsMMap.c");
62 // Assume that the Unixes we are building this for have fnctl() available
63 if env::var_os("CARGO_CFG_UNIX").is_some() {
64 cfg.define("COMPILER_RT_HAS_FCNTL_LCK", Some("1"));
67 // This should be a pretty good heuristic for when to set
68 // COMPILER_RT_HAS_ATOMICS
69 if env::var_os("CARGO_CFG_TARGET_HAS_ATOMIC")
70 .map(|features| features.to_string_lossy().to_lowercase().contains("ptr"))
73 cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
76 // Note that this should exist if we're going to run (otherwise we just
77 // don't build profiler builtins at all).
78 let root = Path::new("../../src/llvm-project/compiler-rt");
80 let src_root = root.join("lib").join("profile");
81 for src in profile_sources {
82 let path = src_root.join(src);
88 cfg.include(root.join("include"));
90 cfg.compile("profiler-rt");