library/profiler_builtins/build.rs

   1 //! Compiles the profiler part of the `compiler-rt` library.
   2 //!
   3 //! See the build.rs for libcompiler_builtins crate for details.
   4
   5 use std::env;
   6 use std::path::Path;
   7
   8 fn main() {
   9     let target = env::var("TARGET").expect("TARGET was not set");
  10     let cfg = &mut cc::Build::new();
  11
  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![
  15         "GCDAProfiling.c",
  16         "InstrProfiling.c",
  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",
  35     ];
  36
  37     if target.contains("msvc") {
  38         // Don't pull in extra libraries on MSVC
  39         cfg.flag("/Zl");
  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"));
  46     } else {
  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"));
  55         } else {
  56             profile_sources.push("WindowsMMap.c");
  57         }
  58     }
  59
  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"));
  63     }
  64
  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"))
  69         .unwrap_or(false)
  70     {
  71         cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
  72     }
  73
  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");
  77
  78     let src_root = root.join("lib").join("profile");
  79     for src in profile_sources {
  80         let path = src_root.join(src);
  81         if path.exists() {
  82             cfg.file(path);
  83         }
  84     }
  85
  86     cfg.include(root.join("include"));
  87     cfg.warnings(false);
  88     cfg.compile("profiler-rt");
  89 }