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+//! A library for build scripts to compile custom C code
+//!
+//! This library is intended to be used as a `build-dependencies` entry in
+//! `Cargo.toml`:
+//!
+//! ```toml
+//! [build-dependencies]
+//! gcc = "0.3"
+//! ```
+//!
+//! The purpose of this crate is to provide the utility functions necessary to
+//! compile C code into a static archive which is then linked into a Rust crate.
+//! The top-level `compile_library` function serves as a convenience and more
+//! advanced configuration is available through the `Config` builder.
+//!
+//! This crate will automatically detect situations such as cross compilation or
+//! other environment variables set by Cargo and will build code appropriately.
+//!
+//! # Examples
+//!
+//! Use the default configuration:
+//!
+//! ```no_run
+//! extern crate gcc;
+//!
+//! fn main() {
+//! gcc::compile_library("libfoo.a", &["src/foo.c"]);
+//! }
+//! ```
+//!
+//! Use more advanced configuration:
+//!
+//! ```no_run
+//! extern crate gcc;
+//!
+//! fn main() {
+//! gcc::Config::new()
+//! .file("src/foo.c")
+//! .define("FOO", Some("bar"))
+//! .include("src")
+//! .compile("libfoo.a");
+//! }
+//! ```
+
+#![doc(html_root_url = "https://docs.rs/gcc/0.3")]
+#![cfg_attr(test, deny(warnings))]
+#![deny(missing_docs)]
+
+#[cfg(feature = "parallel")]
+extern crate rayon;
+
+use std::env;
+use std::ffi::{OsString, OsStr};
+use std::fs;
+use std::path::{PathBuf, Path};
+use std::process::{Command, Stdio, Child};
+use std::io::{self, BufReader, BufRead, Read, Write};
+use std::thread::{self, JoinHandle};
+
+#[cfg(windows)]
+mod registry;
+pub mod windows_registry;
+
+/// Extra configuration to pass to gcc.
+pub struct Config {
+ include_directories: Vec<PathBuf>,
+ definitions: Vec<(String, Option<String>)>,
+ objects: Vec<PathBuf>,
+ flags: Vec<String>,
+ files: Vec<PathBuf>,
+ cpp: bool,
+ cpp_link_stdlib: Option<Option<String>>,
+ cpp_set_stdlib: Option<String>,
+ target: Option<String>,
+ host: Option<String>,
+ out_dir: Option<PathBuf>,
+ opt_level: Option<String>,
+ debug: Option<bool>,
+ env: Vec<(OsString, OsString)>,
+ compiler: Option<PathBuf>,
+ archiver: Option<PathBuf>,
+ cargo_metadata: bool,
+ pic: Option<bool>,
+}
+
+/// Configuration used to represent an invocation of a C compiler.
+///
+/// This can be used to figure out what compiler is in use, what the arguments
+/// to it are, and what the environment variables look like for the compiler.
+/// This can be used to further configure other build systems (e.g. forward
+/// along CC and/or CFLAGS) or the `to_command` method can be used to run the
+/// compiler itself.
+pub struct Tool {
+ path: PathBuf,
+ args: Vec<OsString>,
+ env: Vec<(OsString, OsString)>,
+ family: ToolFamily
+}
+
+/// Represents the family of tools this tool belongs to.
+///
+/// Each family of tools differs in how and what arguments they accept.
+///
+/// Detection of a family is done on best-effort basis and may not accurately reflect the tool.
+#[derive(Copy, Clone, Debug)]
+enum ToolFamily {
+ /// Tool is GNU Compiler Collection-like.
+ Gnu,
+ /// Tool is Clang-like. It differs from the GCC in a sense that it accepts superset of flags
+ /// and its cross-compilation approach is different.
+ Clang,
+ /// Tool is the MSVC cl.exe.
+ Msvc,
+}
+
+impl ToolFamily {
+ /// What the flag to request debug info for this family of tools look like
+ fn debug_flag(&self) -> &'static str {
+ match *self {
+ ToolFamily::Msvc => "/Z7",
+ ToolFamily::Gnu |
+ ToolFamily::Clang => "-g",
+ }
+ }
+
+ /// What the flag to include directories into header search path looks like
+ fn include_flag(&self) -> &'static str {
+ match *self {
+ ToolFamily::Msvc => "/I",
+ ToolFamily::Gnu |
+ ToolFamily::Clang => "-I",
+ }
+ }
+
+ /// What the flag to request macro-expanded source output looks like
+ fn expand_flag(&self) -> &'static str {
+ match *self {
+ ToolFamily::Msvc => "/E",
+ ToolFamily::Gnu |
+ ToolFamily::Clang => "-E",
+ }
+ }
+}
+
+/// Compile a library from the given set of input C files.
+///
+/// This will simply compile all files into object files and then assemble them
+/// into the output. This will read the standard environment variables to detect
+/// cross compilations and such.
+///
+/// This function will also print all metadata on standard output for Cargo.
+///
+/// # Example
+///
+/// ```no_run
+/// gcc::compile_library("libfoo.a", &["foo.c", "bar.c"]);
+/// ```
+pub fn compile_library(output: &str, files: &[&str]) {
+ let mut c = Config::new();
+ for f in files.iter() {
+ c.file(*f);
+ }
+ c.compile(output);
+}
+
+impl Config {
+ /// Construct a new instance of a blank set of configuration.
+ ///
+ /// This builder is finished with the `compile` function.
+ pub fn new() -> Config {
+ Config {
+ include_directories: Vec::new(),
+ definitions: Vec::new(),
+ objects: Vec::new(),
+ flags: Vec::new(),
+ files: Vec::new(),
+ cpp: false,
+ cpp_link_stdlib: None,
+ cpp_set_stdlib: None,
+ target: None,
+ host: None,
+ out_dir: None,
+ opt_level: None,
+ debug: None,
+ env: Vec::new(),
+ compiler: None,
+ archiver: None,
+ cargo_metadata: true,
+ pic: None,
+ }
+ }
+
+ /// Add a directory to the `-I` or include path for headers
+ pub fn include<P: AsRef<Path>>(&mut self, dir: P) -> &mut Config {
+ self.include_directories.push(dir.as_ref().to_path_buf());
+ self
+ }
+
+ /// Specify a `-D` variable with an optional value.
+ pub fn define(&mut self, var: &str, val: Option<&str>) -> &mut Config {
+ self.definitions.push((var.to_string(), val.map(|s| s.to_string())));
+ self
+ }
+
+ /// Add an arbitrary object file to link in
+ pub fn object<P: AsRef<Path>>(&mut self, obj: P) -> &mut Config {
+ self.objects.push(obj.as_ref().to_path_buf());
+ self
+ }
+
+ /// Add an arbitrary flag to the invocation of the compiler
+ pub fn flag(&mut self, flag: &str) -> &mut Config {
+ self.flags.push(flag.to_string());
+ self
+ }
+
+ /// Add a file which will be compiled
+ pub fn file<P: AsRef<Path>>(&mut self, p: P) -> &mut Config {
+ self.files.push(p.as_ref().to_path_buf());
+ self
+ }
+
+ /// Set C++ support.
+ ///
+ /// The other `cpp_*` options will only become active if this is set to
+ /// `true`.
+ pub fn cpp(&mut self, cpp: bool) -> &mut Config {
+ self.cpp = cpp;
+ self
+ }
+
+ /// Set the standard library to link against when compiling with C++
+ /// support.
+ ///
+ /// The default value of this property depends on the current target: On
+ /// OS X `Some("c++")` is used, when compiling for a Visual Studio based
+ /// target `None` is used and for other targets `Some("stdc++")` is used.
+ ///
+ /// A value of `None` indicates that no automatic linking should happen,
+ /// otherwise cargo will link against the specified library.
+ ///
+ /// The given library name must not contain the `lib` prefix.
+ pub fn cpp_link_stdlib(&mut self, cpp_link_stdlib: Option<&str>) -> &mut Config {
+ self.cpp_link_stdlib = Some(cpp_link_stdlib.map(|s| s.into()));
+ self
+ }
+
+ /// Force the C++ compiler to use the specified standard library.
+ ///
+ /// Setting this option will automatically set `cpp_link_stdlib` to the same
+ /// value.
+ ///
+ /// The default value of this option is always `None`.
+ ///
+ /// This option has no effect when compiling for a Visual Studio based
+ /// target.
+ ///
+ /// This option sets the `-stdlib` flag, which is only supported by some
+ /// compilers (clang, icc) but not by others (gcc). The library will not
+ /// detect which compiler is used, as such it is the responsibility of the
+ /// caller to ensure that this option is only used in conjuction with a
+ /// compiler which supports the `-stdlib` flag.
+ ///
+ /// A value of `None` indicates that no specific C++ standard library should
+ /// be used, otherwise `-stdlib` is added to the compile invocation.
+ ///
+ /// The given library name must not contain the `lib` prefix.
+ pub fn cpp_set_stdlib(&mut self, cpp_set_stdlib: Option<&str>) -> &mut Config {
+ self.cpp_set_stdlib = cpp_set_stdlib.map(|s| s.into());
+ self.cpp_link_stdlib(cpp_set_stdlib);
+ self
+ }
+
+ /// Configures the target this configuration will be compiling for.
+ ///
+ /// This option is automatically scraped from the `TARGET` environment
+ /// variable by build scripts, so it's not required to call this function.
+ pub fn target(&mut self, target: &str) -> &mut Config {
+ self.target = Some(target.to_string());
+ self
+ }
+
+ /// Configures the host assumed by this configuration.
+ ///
+ /// This option is automatically scraped from the `HOST` environment
+ /// variable by build scripts, so it's not required to call this function.
+ pub fn host(&mut self, host: &str) -> &mut Config {
+ self.host = Some(host.to_string());
+ self
+ }
+
+ /// Configures the optimization level of the generated object files.
+ ///
+ /// This option is automatically scraped from the `OPT_LEVEL` environment
+ /// variable by build scripts, so it's not required to call this function.
+ pub fn opt_level(&mut self, opt_level: u32) -> &mut Config {
+ self.opt_level = Some(opt_level.to_string());
+ self
+ }
+
+ /// Configures the optimization level of the generated object files.
+ ///
+ /// This option is automatically scraped from the `OPT_LEVEL` environment
+ /// variable by build scripts, so it's not required to call this function.
+ pub fn opt_level_str(&mut self, opt_level: &str) -> &mut Config {
+ self.opt_level = Some(opt_level.to_string());
+ self
+ }
+
+ /// Configures whether the compiler will emit debug information when
+ /// generating object files.
+ ///
+ /// This option is automatically scraped from the `PROFILE` environment
+ /// variable by build scripts (only enabled when the profile is "debug"), so
+ /// it's not required to call this function.
+ pub fn debug(&mut self, debug: bool) -> &mut Config {
+ self.debug = Some(debug);
+ self
+ }
+
+ /// Configures the output directory where all object files and static
+ /// libraries will be located.
+ ///
+ /// This option is automatically scraped from the `OUT_DIR` environment
+ /// variable by build scripts, so it's not required to call this function.
+ pub fn out_dir<P: AsRef<Path>>(&mut self, out_dir: P) -> &mut Config {
+ self.out_dir = Some(out_dir.as_ref().to_owned());
+ self
+ }
+
+ /// Configures the compiler to be used to produce output.
+ ///
+ /// This option is automatically determined from the target platform or a
+ /// number of environment variables, so it's not required to call this
+ /// function.
+ pub fn compiler<P: AsRef<Path>>(&mut self, compiler: P) -> &mut Config {
+ self.compiler = Some(compiler.as_ref().to_owned());
+ self
+ }
+
+ /// Configures the tool used to assemble archives.
+ ///
+ /// This option is automatically determined from the target platform or a
+ /// number of environment variables, so it's not required to call this
+ /// function.
+ pub fn archiver<P: AsRef<Path>>(&mut self, archiver: P) -> &mut Config {
+ self.archiver = Some(archiver.as_ref().to_owned());
+ self
+ }
+ /// Define whether metadata should be emitted for cargo allowing it to
+ /// automatically link the binary. Defaults to `true`.
+ pub fn cargo_metadata(&mut self, cargo_metadata: bool) -> &mut Config {
+ self.cargo_metadata = cargo_metadata;
+ self
+ }
+
+ /// Configures whether the compiler will emit position independent code.
+ ///
+ /// This option defaults to `false` for `windows-gnu` targets and
+ /// to `true` for all other targets.
+ pub fn pic(&mut self, pic: bool) -> &mut Config {
+ self.pic = Some(pic);
+ self
+ }
+
+
+ #[doc(hidden)]
+ pub fn __set_env<A, B>(&mut self, a: A, b: B) -> &mut Config
+ where A: AsRef<OsStr>,
+ B: AsRef<OsStr>
+ {
+ self.env.push((a.as_ref().to_owned(), b.as_ref().to_owned()));
+ self
+ }
+
+ /// Run the compiler, generating the file `output`
+ ///
+ /// The name `output` must begin with `lib` and end with `.a`
+ pub fn compile(&self, output: &str) {
+ assert!(output.starts_with("lib"));
+ assert!(output.ends_with(".a"));
+ let lib_name = &output[3..output.len() - 2];
+ let dst = self.get_out_dir();
+
+ let mut objects = Vec::new();
+ let mut src_dst = Vec::new();
+ for file in self.files.iter() {
+ let obj = dst.join(file).with_extension("o");
+ let obj = if !obj.starts_with(&dst) {
+ dst.join(obj.file_name().unwrap())
+ } else {
+ obj
+ };
+ fs::create_dir_all(&obj.parent().unwrap()).unwrap();
+ src_dst.push((file.to_path_buf(), obj.clone()));
+ objects.push(obj);
+ }
+ self.compile_objects(&src_dst);
+ self.assemble(lib_name, &dst.join(output), &objects);
+
+ if self.get_target().contains("msvc") {
+ let compiler = self.get_base_compiler();
+ let atlmfc_lib = compiler.env()
+ .iter()
+ .find(|&&(ref var, _)| var.as_os_str() == OsStr::new("LIB"))
+ .and_then(|&(_, ref lib_paths)| {
+ env::split_paths(lib_paths).find(|path| {
+ let sub = Path::new("atlmfc/lib");
+ path.ends_with(sub) || path.parent().map_or(false, |p| p.ends_with(sub))
+ })
+ });
+
+ if let Some(atlmfc_lib) = atlmfc_lib {
+ self.print(&format!("cargo:rustc-link-search=native={}", atlmfc_lib.display()));
+ }
+ }
+
+ self.print(&format!("cargo:rustc-link-lib=static={}",
+ &output[3..output.len() - 2]));
+ self.print(&format!("cargo:rustc-link-search=native={}", dst.display()));
+
+ // Add specific C++ libraries, if enabled.
+ if self.cpp {
+ if let Some(stdlib) = self.get_cpp_link_stdlib() {
+ self.print(&format!("cargo:rustc-link-lib={}", stdlib));
+ }
+ }
+ }
+
+ #[cfg(feature = "parallel")]
+ fn compile_objects(&self, objs: &[(PathBuf, PathBuf)]) {
+ use self::rayon::prelude::*;
+
+ let mut cfg = rayon::Configuration::new();
+ if let Ok(amt) = env::var("NUM_JOBS") {
+ if let Ok(amt) = amt.parse() {
+ cfg = cfg.set_num_threads(amt);
+ }
+ }
+ drop(rayon::initialize(cfg));
+
+ objs.par_iter().weight_max().for_each(|&(ref src, ref dst)| self.compile_object(src, dst));
+ }
+
+ #[cfg(not(feature = "parallel"))]
+ fn compile_objects(&self, objs: &[(PathBuf, PathBuf)]) {
+ for &(ref src, ref dst) in objs {
+ self.compile_object(src, dst);
+ }
+ }
+
+ fn compile_object(&self, file: &Path, dst: &Path) {
+ let is_asm = file.extension().and_then(|s| s.to_str()) == Some("asm");
+ let msvc = self.get_target().contains("msvc");
+ let (mut cmd, name) = if msvc && is_asm {
+ self.msvc_macro_assembler()
+ } else {
+ let compiler = self.get_compiler();
+ let mut cmd = compiler.to_command();
+ for &(ref a, ref b) in self.env.iter() {
+ cmd.env(a, b);
+ }
+ (cmd,
+ compiler.path
+ .file_name()
+ .unwrap()
+ .to_string_lossy()
+ .into_owned())
+ };
+ if msvc && is_asm {
+ cmd.arg("/Fo").arg(dst);
+ } else if msvc {
+ let mut s = OsString::from("/Fo");
+ s.push(&dst);
+ cmd.arg(s);
+ } else {
+ cmd.arg("-o").arg(&dst);
+ }
+ cmd.arg(if msvc { "/c" } else { "-c" });
+ cmd.arg(file);
+
+ run(&mut cmd, &name);
+ }
+
+ /// Run the compiler, returning the macro-expanded version of the input files.
+ ///
+ /// This is only relevant for C and C++ files.
+ pub fn expand(&self) -> Vec<u8> {
+ let compiler = self.get_compiler();
+ let mut cmd = compiler.to_command();
+ for &(ref a, ref b) in self.env.iter() {
+ cmd.env(a, b);
+ }
+ cmd.arg(compiler.family.expand_flag());
+ for file in self.files.iter() {
+ cmd.arg(file);
+ }
+
+ let name = compiler.path
+ .file_name()
+ .unwrap()
+ .to_string_lossy()
+ .into_owned();
+
+ run_output(&mut cmd, &name)
+ }
+
+ /// Get the compiler that's in use for this configuration.
+ ///
+ /// This function will return a `Tool` which represents the culmination
+ /// of this configuration at a snapshot in time. The returned compiler can
+ /// be inspected (e.g. the path, arguments, environment) to forward along to
+ /// other tools, or the `to_command` method can be used to invoke the
+ /// compiler itself.
+ ///
+ /// This method will take into account all configuration such as debug
+ /// information, optimization level, include directories, defines, etc.
+ /// Additionally, the compiler binary in use follows the standard
+ /// conventions for this path, e.g. looking at the explicitly set compiler,
+ /// environment variables (a number of which are inspected here), and then
+ /// falling back to the default configuration.
+ pub fn get_compiler(&self) -> Tool {
+ let opt_level = self.get_opt_level();
+ let target = self.get_target();
+
+ let mut cmd = self.get_base_compiler();
+ let nvcc = cmd.path.file_name()
+ .and_then(|p| p.to_str()).map(|p| p.contains("nvcc"))
+ .unwrap_or(false);
+
+ // Non-target flags
+ // If the flag is not conditioned on target variable, it belongs here :)
+ match cmd.family {
+ ToolFamily::Msvc => {
+ cmd.args.push("/nologo".into());
+ let features = env::var("CARGO_CFG_TARGET_FEATURE")
+ .unwrap_or(String::new());
+ if features.contains("crt-static") {
+ cmd.args.push("/MT".into());
+ } else {
+ cmd.args.push("/MD".into());
+ }
+ match &opt_level[..] {
+ "z" | "s" => cmd.args.push("/Os".into()),
+ "1" => cmd.args.push("/O1".into()),
+ // -O3 is a valid value for gcc and clang compilers, but not msvc. Cap to /O2.
+ "2" | "3" => cmd.args.push("/O2".into()),
+ _ => {}
+ }
+ }
+ ToolFamily::Gnu |
+ ToolFamily::Clang => {
+ cmd.args.push(format!("-O{}", opt_level).into());
+ if !nvcc {
+ cmd.args.push("-ffunction-sections".into());
+ cmd.args.push("-fdata-sections".into());
+ if self.pic.unwrap_or(!target.contains("windows-gnu")) {
+ cmd.args.push("-fPIC".into());
+ }
+ } else if self.pic.unwrap_or(false) {
+ cmd.args.push("-Xcompiler".into());
+ cmd.args.push("\'-fPIC\'".into());
+ }
+ }
+ }
+ for arg in self.envflags(if self.cpp {"CXXFLAGS"} else {"CFLAGS"}) {
+ cmd.args.push(arg.into());
+ }
+
+ if self.get_debug() {
+ cmd.args.push(cmd.family.debug_flag().into());
+ }
+
+ // Target flags
+ match cmd.family {
+ ToolFamily::Clang => {
+ cmd.args.push(format!("--target={}", target).into());
+ }
+ ToolFamily::Msvc => {
+ if target.contains("i586") {
+ cmd.args.push("/ARCH:IA32".into());
+ }
+ }
+ ToolFamily::Gnu => {
+ if target.contains("i686") || target.contains("i586") {
+ cmd.args.push("-m32".into());
+ } else if target.contains("x86_64") || target.contains("powerpc64") {
+ cmd.args.push("-m64".into());
+ }
+
+ if target.contains("musl") {
+ cmd.args.push("-static".into());
+ }
+
+ // armv7 targets get to use armv7 instructions
+ if target.starts_with("armv7-unknown-linux-") {
+ cmd.args.push("-march=armv7-a".into());
+ }
+
+ // On android we can guarantee some extra float instructions
+ // (specified in the android spec online)
+ if target.starts_with("armv7-linux-androideabi") {
+ cmd.args.push("-march=armv7-a".into());
+ cmd.args.push("-mfpu=vfpv3-d16".into());
+ }
+
+ // For us arm == armv6 by default
+ if target.starts_with("arm-unknown-linux-") {
+ cmd.args.push("-march=armv6".into());
+ cmd.args.push("-marm".into());
+ }
+
+ // Turn codegen down on i586 to avoid some instructions.
+ if target.starts_with("i586-unknown-linux-") {
+ cmd.args.push("-march=pentium".into());
+ }
+
+ // Set codegen level for i686 correctly
+ if target.starts_with("i686-unknown-linux-") {
+ cmd.args.push("-march=i686".into());
+ }
+
+ // Looks like `musl-gcc` makes is hard for `-m32` to make its way
+ // all the way to the linker, so we need to actually instruct the
+ // linker that we're generating 32-bit executables as well. This'll
+ // typically only be used for build scripts which transitively use
+ // these flags that try to compile executables.
+ if target == "i686-unknown-linux-musl" {
+ cmd.args.push("-Wl,-melf_i386".into());
+ }
+
+ if target.starts_with("thumb") {
+ cmd.args.push("-mthumb".into());
+
+ if target.ends_with("eabihf") {
+ cmd.args.push("-mfloat-abi=hard".into())
+ }
+ }
+ if target.starts_with("thumbv6m") {
+ cmd.args.push("-march=armv6s-m".into());
+ }
+ if target.starts_with("thumbv7em") {
+ cmd.args.push("-march=armv7e-m".into());
+
+ if target.ends_with("eabihf") {
+ cmd.args.push("-mfpu=fpv4-sp-d16".into())
+ }
+ }
+ if target.starts_with("thumbv7m") {
+ cmd.args.push("-march=armv7-m".into());
+ }
+ }
+ }
+
+ if target.contains("-ios") {
+ // FIXME: potential bug. iOS is always compiled with Clang, but Gcc compiler may be
+ // detected instead.
+ self.ios_flags(&mut cmd);
+ }
+
+ if self.cpp {
+ match (self.cpp_set_stdlib.as_ref(), cmd.family) {
+ (None, _) => { }
+ (Some(stdlib), ToolFamily::Gnu) |
+ (Some(stdlib), ToolFamily::Clang) => {
+ cmd.args.push(format!("-stdlib=lib{}", stdlib).into());
+ }
+ _ => {
+ println!("cargo:warning=cpp_set_stdlib is specified, but the {:?} compiler \
+ does not support this option, ignored", cmd.family);
+ }
+ }
+ }
+
+ for directory in self.include_directories.iter() {
+ cmd.args.push(cmd.family.include_flag().into());
+ cmd.args.push(directory.into());
+ }
+
+ for flag in self.flags.iter() {
+ cmd.args.push(flag.into());
+ }
+
+ for &(ref key, ref value) in self.definitions.iter() {
+ let lead = if let ToolFamily::Msvc = cmd.family {"/"} else {"-"};
+ if let &Some(ref value) = value {
+ cmd.args.push(format!("{}D{}={}", lead, key, value).into());
+ } else {
+ cmd.args.push(format!("{}D{}", lead, key).into());
+ }
+ }
+ cmd
+ }
+
+ fn msvc_macro_assembler(&self) -> (Command, String) {
+ let target = self.get_target();
+ let tool = if target.contains("x86_64") {
+ "ml64.exe"
+ } else {
+ "ml.exe"
+ };
+ let mut cmd = windows_registry::find(&target, tool).unwrap_or_else(|| self.cmd(tool));
+ for directory in self.include_directories.iter() {
+ cmd.arg("/I").arg(directory);
+ }
+ for &(ref key, ref value) in self.definitions.iter() {
+ if let &Some(ref value) = value {
+ cmd.arg(&format!("/D{}={}", key, value));
+ } else {
+ cmd.arg(&format!("/D{}", key));
+ }
+ }
+
+ if target.contains("i686") || target.contains("i586") {
+ cmd.arg("/safeseh");
+ }
+ for flag in self.flags.iter() {
+ cmd.arg(flag);
+ }
+
+ (cmd, tool.to_string())
+ }
+
+ fn assemble(&self, lib_name: &str, dst: &Path, objects: &[PathBuf]) {
+ // Delete the destination if it exists as the `ar` tool at least on Unix
+ // appends to it, which we don't want.
+ let _ = fs::remove_file(&dst);
+
+ let target = self.get_target();
+ if target.contains("msvc") {
+ let mut cmd = match self.archiver {
+ Some(ref s) => self.cmd(s),
+ None => windows_registry::find(&target, "lib.exe").unwrap_or(self.cmd("lib.exe")),
+ };
+ let mut out = OsString::from("/OUT:");
+ out.push(dst);
+ run(cmd.arg(out)
+ .arg("/nologo")
+ .args(objects)
+ .args(&self.objects),
+ "lib.exe");
+
+ // The Rust compiler will look for libfoo.a and foo.lib, but the
+ // MSVC linker will also be passed foo.lib, so be sure that both
+ // exist for now.
+ let lib_dst = dst.with_file_name(format!("{}.lib", lib_name));
+ let _ = fs::remove_file(&lib_dst);
+ fs::hard_link(&dst, &lib_dst)
+ .or_else(|_| {
+ // if hard-link fails, just copy (ignoring the number of bytes written)
+ fs::copy(&dst, &lib_dst).map(|_| ())
+ })
+ .ok()
+ .expect("Copying from {:?} to {:?} failed.");;
+ } else {
+ let ar = self.get_ar();
+ let cmd = ar.file_name().unwrap().to_string_lossy();
+ run(self.cmd(&ar)
+ .arg("crs")
+ .arg(dst)
+ .args(objects)
+ .args(&self.objects),
+ &cmd);
+ }
+ }
+
+ fn ios_flags(&self, cmd: &mut Tool) {
+ enum ArchSpec {
+ Device(&'static str),
+ Simulator(&'static str),
+ }
+
+ let target = self.get_target();
+ let arch = target.split('-').nth(0).unwrap();
+ let arch = match arch {
+ "arm" | "armv7" | "thumbv7" => ArchSpec::Device("armv7"),
+ "armv7s" | "thumbv7s" => ArchSpec::Device("armv7s"),
+ "arm64" | "aarch64" => ArchSpec::Device("arm64"),
+ "i386" | "i686" => ArchSpec::Simulator("-m32"),
+ "x86_64" => ArchSpec::Simulator("-m64"),
+ _ => fail("Unknown arch for iOS target"),
+ };
+
+ let sdk = match arch {
+ ArchSpec::Device(arch) => {
+ cmd.args.push("-arch".into());
+ cmd.args.push(arch.into());
+ cmd.args.push("-miphoneos-version-min=7.0".into());
+ "iphoneos"
+ }
+ ArchSpec::Simulator(arch) => {
+ cmd.args.push(arch.into());
+ cmd.args.push("-mios-simulator-version-min=7.0".into());
+ "iphonesimulator"
+ }
+ };
+
+ self.print(&format!("Detecting iOS SDK path for {}", sdk));
+ let sdk_path = self.cmd("xcrun")
+ .arg("--show-sdk-path")
+ .arg("--sdk")
+ .arg(sdk)
+ .stderr(Stdio::inherit())
+ .output()
+ .unwrap()
+ .stdout;
+
+ let sdk_path = String::from_utf8(sdk_path).unwrap();
+
+ cmd.args.push("-isysroot".into());
+ cmd.args.push(sdk_path.trim().into());
+ }
+
+ fn cmd<P: AsRef<OsStr>>(&self, prog: P) -> Command {
+ let mut cmd = Command::new(prog);
+ for &(ref a, ref b) in self.env.iter() {
+ cmd.env(a, b);
+ }
+ return cmd;
+ }
+
+ fn get_base_compiler(&self) -> Tool {
+ if let Some(ref c) = self.compiler {
+ return Tool::new(c.clone());
+ }
+ let host = self.get_host();
+ let target = self.get_target();
+ let (env, msvc, gnu) = if self.cpp {
+ ("CXX", "cl.exe", "g++")
+ } else {
+ ("CC", "cl.exe", "gcc")
+ };
+
+ let default = if host.contains("solaris") {
+ // In this case, c++/cc unlikely to exist or be correct.
+ gnu
+ } else if self.cpp {
+ "c++"
+ } else {
+ "cc"
+ };
+
+ self.env_tool(env)
+ .map(|(tool, args)| {
+ let mut t = Tool::new(PathBuf::from(tool));
+ for arg in args {
+ t.args.push(arg.into());
+ }
+ return t;
+ })
+ .or_else(|| {
+ if target.contains("emscripten") {
+ if self.cpp {
+ Some(Tool::new(PathBuf::from("em++")))
+ } else {
+ Some(Tool::new(PathBuf::from("emcc")))
+ }
+ } else {
+ None
+ }
+ })
+ .or_else(|| windows_registry::find_tool(&target, "cl.exe"))
+ .unwrap_or_else(|| {
+ let compiler = if host.contains("windows") && target.contains("windows") {
+ if target.contains("msvc") {
+ msvc.to_string()
+ } else {
+ format!("{}.exe", gnu)
+ }
+ } else if target.contains("android") {
+ format!("{}-{}", target.replace("armv7", "arm"), gnu)
+ } else if self.get_host() != target {
+ // CROSS_COMPILE is of the form: "arm-linux-gnueabi-"
+ let cc_env = self.getenv("CROSS_COMPILE");
+ let cross_compile = cc_env.as_ref().map(|s| s.trim_right_matches('-'));
+ let prefix = cross_compile.or(match &target[..] {
+ "aarch64-unknown-linux-gnu" => Some("aarch64-linux-gnu"),
+ "arm-unknown-linux-gnueabi" => Some("arm-linux-gnueabi"),
+ "arm-unknown-linux-gnueabihf" => Some("arm-linux-gnueabihf"),
+ "arm-unknown-linux-musleabi" => Some("arm-linux-musleabi"),
+ "arm-unknown-linux-musleabihf" => Some("arm-linux-musleabihf"),
+ "arm-unknown-netbsdelf-eabi" => Some("arm--netbsdelf-eabi"),
+ "armv6-unknown-netbsdelf-eabihf" => Some("armv6--netbsdelf-eabihf"),
+ "armv7-unknown-linux-gnueabihf" => Some("arm-linux-gnueabihf"),
+ "armv7-unknown-linux-musleabihf" => Some("arm-linux-musleabihf"),
+ "armv7-unknown-netbsdelf-eabihf" => Some("armv7--netbsdelf-eabihf"),
+ "i686-pc-windows-gnu" => Some("i686-w64-mingw32"),
+ "i686-unknown-linux-musl" => Some("musl"),
+ "i686-unknown-netbsdelf" => Some("i486--netbsdelf"),
+ "mips-unknown-linux-gnu" => Some("mips-linux-gnu"),
+ "mipsel-unknown-linux-gnu" => Some("mipsel-linux-gnu"),
+ "mips64-unknown-linux-gnuabi64" => Some("mips64-linux-gnuabi64"),
+ "mips64el-unknown-linux-gnuabi64" => Some("mips64el-linux-gnuabi64"),
+ "powerpc-unknown-linux-gnu" => Some("powerpc-linux-gnu"),
+ "powerpc-unknown-netbsd" => Some("powerpc--netbsd"),
+ "powerpc64-unknown-linux-gnu" => Some("powerpc-linux-gnu"),
+ "powerpc64le-unknown-linux-gnu" => Some("powerpc64le-linux-gnu"),
+ "s390x-unknown-linux-gnu" => Some("s390x-linux-gnu"),
+ "sparc64-unknown-netbsd" => Some("sparc64--netbsd"),
+ "sparcv9-sun-solaris" => Some("sparcv9-sun-solaris"),
+ "thumbv6m-none-eabi" => Some("arm-none-eabi"),
+ "thumbv7em-none-eabi" => Some("arm-none-eabi"),
+ "thumbv7em-none-eabihf" => Some("arm-none-eabi"),
+ "thumbv7m-none-eabi" => Some("arm-none-eabi"),
+ "x86_64-pc-windows-gnu" => Some("x86_64-w64-mingw32"),
+ "x86_64-rumprun-netbsd" => Some("x86_64-rumprun-netbsd"),
+ "x86_64-unknown-linux-musl" => Some("musl"),
+ "x86_64-unknown-netbsd" => Some("x86_64--netbsd"),
+ _ => None,
+ });
+ match prefix {
+ Some(prefix) => format!("{}-{}", prefix, gnu),
+ None => default.to_string(),
+ }
+ } else {
+ default.to_string()
+ };
+ Tool::new(PathBuf::from(compiler))
+ })
+ }
+
+ fn get_var(&self, var_base: &str) -> Result<String, String> {
+ let target = self.get_target();
+ let host = self.get_host();
+ let kind = if host == target { "HOST" } else { "TARGET" };
+ let target_u = target.replace("-", "_");
+ let res = self.getenv(&format!("{}_{}", var_base, target))
+ .or_else(|| self.getenv(&format!("{}_{}", var_base, target_u)))
+ .or_else(|| self.getenv(&format!("{}_{}", kind, var_base)))
+ .or_else(|| self.getenv(var_base));
+
+ match res {
+ Some(res) => Ok(res),
+ None => Err("could not get environment variable".to_string()),
+ }
+ }
+
+ fn envflags(&self, name: &str) -> Vec<String> {
+ self.get_var(name)
+ .unwrap_or(String::new())
+ .split(|c: char| c.is_whitespace())
+ .filter(|s| !s.is_empty())
+ .map(|s| s.to_string())
+ .collect()
+ }
+
+ fn env_tool(&self, name: &str) -> Option<(String, Vec<String>)> {
+ self.get_var(name).ok().map(|tool| {
+ let whitelist = ["ccache", "distcc"];
+ for t in whitelist.iter() {
+ if tool.starts_with(t) && tool[t.len()..].starts_with(" ") {
+ return (t.to_string(), vec![tool[t.len()..].trim_left().to_string()]);
+ }
+ }
+ (tool, Vec::new())
+ })
+ }
+
+ /// Returns the default C++ standard library for the current target: `libc++`
+ /// for OS X and `libstdc++` for anything else.
+ fn get_cpp_link_stdlib(&self) -> Option<String> {
+ self.cpp_link_stdlib.clone().unwrap_or_else(|| {
+ let target = self.get_target();
+ if target.contains("msvc") {
+ None
+ } else if target.contains("darwin") {
+ Some("c++".to_string())
+ } else if target.contains("freebsd") {
+ Some("c++".to_string())
+ } else {
+ Some("stdc++".to_string())
+ }
+ })
+ }
+
+ fn get_ar(&self) -> PathBuf {
+ self.archiver
+ .clone()
+ .or_else(|| self.get_var("AR").map(PathBuf::from).ok())
+ .unwrap_or_else(|| {
+ if self.get_target().contains("android") {
+ PathBuf::from(format!("{}-ar", self.get_target().replace("armv7", "arm")))
+ } else if self.get_target().contains("emscripten") {
+ PathBuf::from("emar")
+ } else {
+ PathBuf::from("ar")
+ }
+ })
+ }
+
+ fn get_target(&self) -> String {
+ self.target.clone().unwrap_or_else(|| self.getenv_unwrap("TARGET"))
+ }
+
+ fn get_host(&self) -> String {
+ self.host.clone().unwrap_or_else(|| self.getenv_unwrap("HOST"))
+ }
+
+ fn get_opt_level(&self) -> String {
+ self.opt_level.as_ref().cloned().unwrap_or_else(|| self.getenv_unwrap("OPT_LEVEL"))
+ }
+
+ fn get_debug(&self) -> bool {
+ self.debug.unwrap_or_else(|| self.getenv_unwrap("PROFILE") == "debug")
+ }
+
+ fn get_out_dir(&self) -> PathBuf {
+ self.out_dir.clone().unwrap_or_else(|| env::var_os("OUT_DIR").map(PathBuf::from).unwrap())
+ }
+
+ fn getenv(&self, v: &str) -> Option<String> {
+ let r = env::var(v).ok();
+ self.print(&format!("{} = {:?}", v, r));
+ r
+ }
+
+ fn getenv_unwrap(&self, v: &str) -> String {
+ match self.getenv(v) {
+ Some(s) => s,
+ None => fail(&format!("environment variable `{}` not defined", v)),
+ }
+ }
+
+ fn print(&self, s: &str) {
+ if self.cargo_metadata {
+ println!("{}", s);
+ }
+ }
+}
+
+impl Tool {
+ fn new(path: PathBuf) -> Tool {
+ // Try to detect family of the tool from its name, falling back to Gnu.
+ let family = if let Some(fname) = path.file_name().and_then(|p| p.to_str()) {
+ if fname.contains("clang") {
+ ToolFamily::Clang
+ } else if fname.contains("cl") {
+ ToolFamily::Msvc
+ } else {
+ ToolFamily::Gnu
+ }
+ } else {
+ ToolFamily::Gnu
+ };
+ Tool {
+ path: path,
+ args: Vec::new(),
+ env: Vec::new(),
+ family: family
+ }
+ }
+
+ /// Converts this compiler into a `Command` that's ready to be run.
+ ///
+ /// This is useful for when the compiler needs to be executed and the
+ /// command returned will already have the initial arguments and environment
+ /// variables configured.
+ pub fn to_command(&self) -> Command {
+ let mut cmd = Command::new(&self.path);
+ cmd.args(&self.args);
+ for &(ref k, ref v) in self.env.iter() {
+ cmd.env(k, v);
+ }
+ cmd
+ }
+
+ /// Returns the path for this compiler.
+ ///
+ /// Note that this may not be a path to a file on the filesystem, e.g. "cc",
+ /// but rather something which will be resolved when a process is spawned.
+ pub fn path(&self) -> &Path {
+ &self.path
+ }
+
+ /// Returns the default set of arguments to the compiler needed to produce
+ /// executables for the target this compiler generates.
+ pub fn args(&self) -> &[OsString] {
+ &self.args
+ }
+
+ /// Returns the set of environment variables needed for this compiler to
+ /// operate.
+ ///
+ /// This is typically only used for MSVC compilers currently.
+ pub fn env(&self) -> &[(OsString, OsString)] {
+ &self.env
+ }
+}
+
+fn run(cmd: &mut Command, program: &str) {
+ let (mut child, print) = spawn(cmd, program);
+ let status = child.wait().expect("failed to wait on child process");
+ print.join().unwrap();
+ println!("{:?}", status);
+ if !status.success() {
+ fail(&format!("command did not execute successfully, got: {}", status));
+ }
+}
+
+fn run_output(cmd: &mut Command, program: &str) -> Vec<u8> {
+ cmd.stdout(Stdio::piped());
+ let (mut child, print) = spawn(cmd, program);
+ let mut stdout = vec![];
+ child.stdout.take().unwrap().read_to_end(&mut stdout).unwrap();
+ let status = child.wait().expect("failed to wait on child process");
+ print.join().unwrap();
+ println!("{:?}", status);
+ if !status.success() {
+ fail(&format!("command did not execute successfully, got: {}", status));
+ }
+ return stdout
+}
+
+fn spawn(cmd: &mut Command, program: &str) -> (Child, JoinHandle<()>) {
+ println!("running: {:?}", cmd);
+
+ // Capture the standard error coming from these programs, and write it out
+ // with cargo:warning= prefixes. Note that this is a bit wonky to avoid
+ // requiring the output to be UTF-8, we instead just ship bytes from one
+ // location to another.
+ match cmd.stderr(Stdio::piped()).spawn() {
+ Ok(mut child) => {
+ let stderr = BufReader::new(child.stderr.take().unwrap());
+ let print = thread::spawn(move || {
+ for line in stderr.split(b'\n').filter_map(|l| l.ok()) {
+ print!("cargo:warning=");
+ std::io::stdout().write_all(&line).unwrap();
+ println!("");
+ }
+ });
+ (child, print)
+ }
+ Err(ref e) if e.kind() == io::ErrorKind::NotFound => {
+ let extra = if cfg!(windows) {
+ " (see https://github.com/alexcrichton/gcc-rs#compile-time-requirements \
+ for help)"
+ } else {
+ ""
+ };
+ fail(&format!("failed to execute command: {}\nIs `{}` \
+ not installed?{}",
+ e,
+ program,
+ extra));
+ }
+ Err(e) => fail(&format!("failed to execute command: {}", e)),
+ }
+}
+
+fn fail(s: &str) -> ! {
+ println!("\n\n{}\n\n", s);
+ panic!()
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-01 00:45:42 +0000