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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! C-compiler probing and detection.
//!
//! This module will fill out the `cc` and `cxx` maps of `Build` by looking for
//! C and C++ compilers for each target configured. A compiler is found through
//! a number of vectors (in order of precedence)
//!
//! 1. Configuration via `target.$target.cc` in `config.toml`.
//! 2. Configuration via `target.$target.android-ndk` in `config.toml`, if
//! applicable
//! 3. Special logic to probe on OpenBSD
//! 4. The `CC_$target` environment variable.
//! 5. The `CC` environment variable.
//! 6. "cc"
//!
//! Some of this logic is implemented here, but much of it is farmed out to the
//! `cc` crate itself, so we end up having the same fallbacks as there.
//! Similar logic is then used to find a C++ compiler, just some s/cc/c++/ is
//! used.
//!
//! It is intended that after this module has run no C/C++ compiler will
//! ever be probed for. Instead the compilers found here will be used for
//! everything.
use std::process::Command;
use std::iter;
use build_helper::{cc2ar, output};
use cc;
use Build;
use config::Target;
use cache::Interned;
pub fn find(build: &mut Build) {
// For all targets we're going to need a C compiler for building some shims
// and such as well as for being a linker for Rust code.
for target in build.targets.iter().chain(&build.hosts).cloned().chain(iter::once(build.build)) {
let mut cfg = cc::Build::new();
cfg.cargo_metadata(false).opt_level(0).warnings(false).debug(false)
.target(&target).host(&build.build);
let config = build.config.target_config.get(&target);
if let Some(cc) = config.and_then(|c| c.cc.as_ref()) {
cfg.compiler(cc);
} else {
set_compiler(&mut cfg, Language::C, target, config, build);
}
let compiler = cfg.get_compiler();
let ar = cc2ar(compiler.path(), &target);
build.verbose(&format!("CC_{} = {:?}", &target, compiler.path()));
if let Some(ref ar) = ar {
build.verbose(&format!("AR_{} = {:?}", &target, ar));
}
build.cc.insert(target, (compiler, ar));
}
// For all host triples we need to find a C++ compiler as well
for host in build.hosts.iter().cloned().chain(iter::once(build.build)) {
let mut cfg = cc::Build::new();
cfg.cargo_metadata(false).opt_level(0).warnings(false).debug(false).cpp(true)
.target(&host).host(&build.build);
let config = build.config.target_config.get(&host);
if let Some(cxx) = config.and_then(|c| c.cxx.as_ref()) {
cfg.compiler(cxx);
} else {
set_compiler(&mut cfg, Language::CPlusPlus, host, config, build);
}
let compiler = cfg.get_compiler();
build.verbose(&format!("CXX_{} = {:?}", host, compiler.path()));
build.cxx.insert(host, compiler);
}
}
fn set_compiler(cfg: &mut cc::Build,
compiler: Language,
target: Interned<String>,
config: Option<&Target>,
build: &Build) {
match &*target {
// When compiling for android we may have the NDK configured in the
// config.toml in which case we look there. Otherwise the default
// compiler already takes into account the triple in question.
t if t.contains("android") => {
if let Some(ndk) = config.and_then(|c| c.ndk.as_ref()) {
let target = target.replace("armv7", "arm");
let compiler = format!("{}-{}", target, compiler.clang());
cfg.compiler(ndk.join("bin").join(compiler));
}
}
// The default gcc version from OpenBSD may be too old, try using egcc,
// which is a gcc version from ports, if this is the case.
t if t.contains("openbsd") => {
let c = cfg.get_compiler();
let gnu_compiler = compiler.gcc();
if !c.path().ends_with(gnu_compiler) {
return
}
let output = output(c.to_command().arg("--version"));
let i = match output.find(" 4.") {
Some(i) => i,
None => return,
};
match output[i + 3..].chars().next().unwrap() {
'0' ... '6' => {}
_ => return,
}
let alternative = format!("e{}", gnu_compiler);
if Command::new(&alternative).output().is_ok() {
cfg.compiler(alternative);
}
}
"mips-unknown-linux-musl" => {
if cfg.get_compiler().path().to_str() == Some("gcc") {
cfg.compiler("mips-linux-musl-gcc");
}
}
"mipsel-unknown-linux-musl" => {
if cfg.get_compiler().path().to_str() == Some("gcc") {
cfg.compiler("mipsel-linux-musl-gcc");
}
}
t if t.contains("musl") => {
if let Some(root) = build.musl_root(target) {
let guess = root.join("bin/musl-gcc");
if guess.exists() {
cfg.compiler(guess);
}
}
}
_ => {}
}
}
/// The target programming language for a native compiler.
enum Language {
/// The compiler is targeting C.
C,
/// The compiler is targeting C++.
CPlusPlus,
}
impl Language {
/// Obtains the name of a compiler in the GCC collection.
fn gcc(self) -> &'static str {
match self {
Language::C => "gcc",
Language::CPlusPlus => "g++",
}
}
/// Obtains the name of a compiler in the clang suite.
fn clang(self) -> &'static str {
match self {
Language::C => "clang",
Language::CPlusPlus => "clang++",
}
}
}
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