src/liballoc_jemalloc/build.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![deny(warnings)]
  12
  13 extern crate build_helper;
  14 extern crate gcc;
  15
  16 use std::env;
  17 use std::path::PathBuf;
  18 use std::process::Command;
  19 use build_helper::{run, native_lib_boilerplate};
  20
  21 fn main() {
  22     // FIXME: This is a hack to support building targets that don't
  23     // support jemalloc alongside hosts that do. The jemalloc build is
  24     // controlled by a feature of the std crate, and if that feature
  25     // changes between targets, it invalidates the fingerprint of
  26     // std's build script (this is a cargo bug); so we must ensure
  27     // that the feature set used by std is the same across all
  28     // targets, which means we have to build the alloc_jemalloc crate
  29     // for targets like emscripten, even if we don't use it.
  30     let target = env::var("TARGET").expect("TARGET was not set");
  31     let host = env::var("HOST").expect("HOST was not set");
  32     if target.contains("rumprun") || target.contains("bitrig") || target.contains("openbsd") ||
  33        target.contains("msvc") || target.contains("emscripten") || target.contains("fuchsia") ||
  34        target.contains("redox") {
  35         println!("cargo:rustc-cfg=dummy_jemalloc");
  36         return;
  37     }
  38
  39     if target.contains("android") {
  40         println!("cargo:rustc-link-lib=gcc");
  41     } else if !target.contains("windows") && !target.contains("musl") {
  42         println!("cargo:rustc-link-lib=pthread");
  43     }
  44
  45     if let Some(jemalloc) = env::var_os("JEMALLOC_OVERRIDE") {
  46         let jemalloc = PathBuf::from(jemalloc);
  47         println!("cargo:rustc-link-search=native={}",
  48                  jemalloc.parent().unwrap().display());
  49         let stem = jemalloc.file_stem().unwrap().to_str().unwrap();
  50         let name = jemalloc.file_name().unwrap().to_str().unwrap();
  51         let kind = if name.ends_with(".a") {
  52             "static"
  53         } else {
  54             "dylib"
  55         };
  56         println!("cargo:rustc-link-lib={}={}", kind, &stem[3..]);
  57         return;
  58     }
  59
  60     let link_name = if target.contains("windows") { "jemalloc" } else { "jemalloc_pic" };
  61     let native = match native_lib_boilerplate("jemalloc", "jemalloc", link_name, "lib") {
  62         Ok(native) => native,
  63         _ => return,
  64     };
  65
  66     let compiler = gcc::Config::new().get_compiler();
  67     // only msvc returns None for ar so unwrap is okay
  68     let ar = build_helper::cc2ar(compiler.path(), &target).unwrap();
  69     let cflags = compiler.args()
  70         .iter()
  71         .map(|s| s.to_str().unwrap())
  72         .collect::<Vec<_>>()
  73         .join(" ");
  74
  75     let mut cmd = Command::new("sh");
  76     cmd.arg(native.src_dir.join("configure")
  77                           .to_str()
  78                           .unwrap()
  79                           .replace("C:\\", "/c/")
  80                           .replace("\\", "/"))
  81        .current_dir(&native.out_dir)
  82        .env("CC", compiler.path())
  83        .env("EXTRA_CFLAGS", cflags.clone())
  84        // jemalloc generates Makefile deps using GCC's "-MM" flag. This means
  85        // that GCC will run the preprocessor, and only the preprocessor, over
  86        // jemalloc's source files. If we don't specify CPPFLAGS, then at least
  87        // on ARM that step fails with a "Missing implementation for 32-bit
  88        // atomic operations" error. This is because no "-march" flag will be
  89        // passed to GCC, and then GCC won't define the
  90        // "__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4" macro that jemalloc needs to
  91        // select an atomic operation implementation.
  92        .env("CPPFLAGS", cflags.clone())
  93        .env("AR", &ar)
  94        .env("RANLIB", format!("{} s", ar.display()));
  95
  96     if target.contains("windows") {
  97         // A bit of history here, this used to be --enable-lazy-lock added in
  98         // #14006 which was filed with jemalloc in jemalloc/jemalloc#83 which
  99         // was also reported to MinGW:
 100         //
 101         //  http://sourceforge.net/p/mingw-w64/bugs/395/
 102         //
 103         // When updating jemalloc to 4.0, however, it was found that binaries
 104         // would exit with the status code STATUS_RESOURCE_NOT_OWNED indicating
 105         // that a thread was unlocking a mutex it never locked. Disabling this
 106         // "lazy lock" option seems to fix the issue, but it was enabled by
 107         // default for MinGW targets in 13473c7 for jemalloc.
 108         //
 109         // As a result of all that, force disabling lazy lock on Windows, and
 110         // after reading some code it at least *appears* that the initialization
 111         // of mutexes is otherwise ok in jemalloc, so shouldn't cause problems
 112         // hopefully...
 113         //
 114         // tl;dr: make windows behave like other platforms by disabling lazy
 115         //        locking, but requires passing an option due to a historical
 116         //        default with jemalloc.
 117         cmd.arg("--disable-lazy-lock");
 118     } else if target.contains("ios") {
 119         cmd.arg("--disable-tls");
 120     } else if target.contains("android") {
 121         // We force android to have prefixed symbols because apparently
 122         // replacement of the libc allocator doesn't quite work. When this was
 123         // tested (unprefixed symbols), it was found that the `realpath`
 124         // function in libc would allocate with libc malloc (not jemalloc
 125         // malloc), and then the standard library would free with jemalloc free,
 126         // causing a segfault.
 127         //
 128         // If the test suite passes, however, without symbol prefixes then we
 129         // should be good to go!
 130         cmd.arg("--with-jemalloc-prefix=je_");
 131         cmd.arg("--disable-tls");
 132     } else if target.contains("dragonfly") {
 133         cmd.arg("--with-jemalloc-prefix=je_");
 134     }
 135
 136     if cfg!(feature = "debug-jemalloc") {
 137         cmd.arg("--enable-debug");
 138     }
 139
 140     // Turn off broken quarantine (see jemalloc/jemalloc#161)
 141     cmd.arg("--disable-fill");
 142     cmd.arg(format!("--host={}", build_helper::gnu_target(&target)));
 143     cmd.arg(format!("--build={}", build_helper::gnu_target(&host)));
 144
 145     // for some reason, jemalloc configure doesn't detect this value
 146     // automatically for this target
 147     if target == "sparc64-unknown-linux-gnu" {
 148         cmd.arg("--with-lg-quantum=4");
 149     }
 150
 151     run(&mut cmd);
 152
 153     let mut make = Command::new(build_helper::make(&host));
 154     make.current_dir(&native.out_dir)
 155         .arg("build_lib_static");
 156
 157     // mingw make seems... buggy? unclear...
 158     if !host.contains("windows") {
 159         make.arg("-j")
 160             .arg(env::var("NUM_JOBS").expect("NUM_JOBS was not set"));
 161     }
 162
 163     run(&mut make);
 164
 165     // The pthread_atfork symbols is used by jemalloc on android but the really
 166     // old android we're building on doesn't have them defined, so just make
 167     // sure the symbols are available.
 168     if target.contains("androideabi") {
 169         println!("cargo:rerun-if-changed=pthread_atfork_dummy.c");
 170         gcc::Config::new()
 171             .flag("-fvisibility=hidden")
 172             .file("pthread_atfork_dummy.c")
 173             .compile("libpthread_atfork_dummy.a");
 174     }
 175 }