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Rollup merge of #70159 - alexcrichton:update-wasi, r=pietroalbini
[rust.git] / src / libprofiler_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     let mut profile_sources = vec![
13         "GCDAProfiling.c",
14         "InstrProfiling.c",
15         "InstrProfilingBuffer.c",
16         "InstrProfilingFile.c",
17         "InstrProfilingMerge.c",
18         "InstrProfilingMergeFile.c",
19         "InstrProfilingNameVar.c",
20         "InstrProfilingPlatformDarwin.c",
21         "InstrProfilingPlatformLinux.c",
22         "InstrProfilingPlatformOther.c",
23         "InstrProfilingPlatformWindows.c",
24         "InstrProfilingUtil.c",
25         "InstrProfilingValue.c",
26         "InstrProfilingWriter.c",
27     ];
28
29     if target.contains("msvc") {
30         // Don't pull in extra libraries on MSVC
31         cfg.flag("/Zl");
32         profile_sources.push("WindowsMMap.c");
33         cfg.define("strdup", Some("_strdup"));
34         cfg.define("open", Some("_open"));
35         cfg.define("fdopen", Some("_fdopen"));
36         cfg.define("getpid", Some("_getpid"));
37         cfg.define("fileno", Some("_fileno"));
38     } else {
39         // Turn off various features of gcc and such, mostly copying
40         // compiler-rt's build system already
41         cfg.flag("-fno-builtin");
42         cfg.flag("-fvisibility=hidden");
43         cfg.flag("-fomit-frame-pointer");
44         cfg.define("VISIBILITY_HIDDEN", None);
45         if !target.contains("windows") {
46             cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
47         } else {
48             profile_sources.push("WindowsMMap.c");
49         }
50     }
51
52     // Assume that the Unixes we are building this for have fnctl() available
53     if env::var_os("CARGO_CFG_UNIX").is_some() {
54         cfg.define("COMPILER_RT_HAS_FCNTL_LCK", Some("1"));
55     }
56
57     // This should be a pretty good heuristic for when to set
58     // COMPILER_RT_HAS_ATOMICS
59     if env::var_os("CARGO_CFG_TARGET_HAS_ATOMIC")
60         .map(|features| features.to_string_lossy().to_lowercase().contains("cas"))
61         .unwrap_or(false)
62     {
63         cfg.define("COMPILER_RT_HAS_ATOMICS", Some("1"));
64     }
65
66     let root = env::var_os("RUST_COMPILER_RT_ROOT").unwrap();
67     let root = Path::new(&root);
68
69     let src_root = root.join("lib").join("profile");
70     for src in profile_sources {
71         cfg.file(src_root.join(src));
72     }
73
74     // The file was renamed in LLVM 10.
75     let old_runtime_path = src_root.join("InstrProfilingRuntime.cc");
76     let new_runtime_path = src_root.join("InstrProfilingRuntime.cpp");
77     cfg.file(if old_runtime_path.exists() { old_runtime_path } else { new_runtime_path });
78
79     cfg.include(root.join("include"));
80     cfg.warnings(false);
81     cfg.compile("profiler-rt");
82 }