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//! A build dependency for running the correct autotools commands to build a native library //! //! This crate provides the facilities to setup the build system and build native libraries //! that leverage `autotools` or `configure & make` workalike scripts. //! //! ## Installation //! //! Add to your `Cargo.toml` a build dependency: //! //! ```toml //! [build-dependencies] //! autotools = "0.2" //! ``` //! //! ## Usage //! //! ```no_run //! use autotools; //! //! // Build the project in the path `foo` and installs it in `$OUT_DIR` //! let dst = autotools::build("foo"); //! //! // Simply link the library without using pkg-config //! println!("cargo:rustc-link-search=native={}", dst.display()); //! println!("cargo:rustc-link-lib=static=foo"); //! ``` //! //! ```no_run //! use autotools::Config; //! //! let dst = Config::new("foo") //! .reconf("-ivf") //! .enable("feature", None) //! .with("dep", None) //! .disable("otherfeature", None) //! .without("otherdep", None) //! .cflag("-Wall") //! .build(); //! ``` extern crate cc; use std::collections::HashSet; use std::env; use std::ffi::{OsString, OsStr}; use std::fs; use std::io::ErrorKind; use std::path::{Path, PathBuf}; use std::process::Command; enum Kind { Enable, Disable, With, Without, Arbitrary, } /// Builder style configuration for a pending autotools build. /// /// # Note /// /// Note that `host` and `target` have different meanings for Rust /// than for Gnu autotools. For Rust, the "host" machine is the one where the /// compiler is running, and the "target" machine is the one where the /// compiled artifact (library or binary) will be executed. /// For Gnu autotools, the machine where the compiler is running is called /// the "build" machine; the one where the compiled artifact will be /// executed is called the "host" machine; and if the compiled artifact /// happens to be a cross-compiler, it will generate code for a "target" /// machine; otherwise "target" will coincide with "host". /// /// Hence Rust's `host` corresponds to Gnu autotools' "build" and Rust's /// `target` corresponds to their "host" (though the relevant names will sometimes /// differ slightly). /// /// The `host` and `target` methods on this package's `autotools::Config` structure (as well as /// the `$HOST` and `$TARGET` variables set by cargo) are understood with their /// Rust meaning. /// /// When cross-compiling, we try to calculate automatically what Gnu autotools will expect for its /// "host" value, and supply that to the `configure` script using a `--host="..."` argument. If the /// auto-calculation is incorrect, you can override it with the `config_option` method, like this: /// /// ```no_run /// use autotools; /// /// // Builds the project in the directory located in `libfoo`, installing it /// // into $OUT_DIR /// let mut cfg = autotools::Config::new("libfoo_source_directory"); /// cfg.config_option("host", Some("i686-pc-windows-gnu")); /// let dst = cfg.build(); /// /// println!("cargo:rustc-link-search=native={}", dst.display()); /// println!("cargo:rustc-link-lib=static=foo"); /// ``` pub struct Config { enable_shared: bool, enable_static: bool, path: PathBuf, cflags: OsString, cxxflags: OsString, ldflags: OsString, options: Vec<(Kind, OsString, Option<OsString>)>, target: Option<String>, make_args: Option<Vec<String>>, make_targets: Option<Vec<String>>, host: Option<String>, out_dir: Option<PathBuf>, env: Vec<(OsString, OsString)>, reconfig: Option<OsString>, build_insource: bool, forbidden_args: HashSet<String>, } /// Builds the native library rooted at `path` with the default configure options. /// This will return the directory in which the library was installed. /// /// # Examples /// /// ```no_run /// use autotools; /// /// // Builds the project in the directory located in `libfoo`, installing it /// // into $OUT_DIR /// let dst = autotools::build("libfoo"); /// /// println!("cargo:rustc-link-search=native={}", dst.display()); /// println!("cargo:rustc-link-lib=static=foo"); /// ``` /// pub fn build<P: AsRef<Path>>(path: P) -> PathBuf { Config::new(path.as_ref()) .build() } impl Config { /// Creates a new blank set of configuration to build the project specified /// at the path `path`. pub fn new<P: AsRef<Path>>(path: P) -> Config { Config { enable_shared: false, enable_static: true, path: env::current_dir().unwrap().join(path), cflags: OsString::new(), cxxflags: OsString::new(), ldflags: OsString::new(), options: Vec::new(), make_args: None, make_targets: None, out_dir: None, target: None, host: None, env: Vec::new(), reconfig: None, build_insource: false, forbidden_args: HashSet::new(), } } /// Enables building as a shared library (`--enable-shared`). pub fn enable_shared(&mut self) -> &mut Config { self.enable_shared = true; self } /// Disables building as a shared library (`--disable-shared`). pub fn disable_shared(&mut self) -> &mut Config { self.enable_shared = false; self } /// Enables building as a static library (`--enable-static`). pub fn enable_static(&mut self) -> &mut Config { self.enable_static = true; self } /// Disables building as a static library (`--disable-static`). pub fn disable_static(&mut self) -> &mut Config { self.enable_static = false; self } /// Additional arguments to pass through to `make`. pub fn make_args(&mut self, flags: Vec<String>) -> &mut Config { self.make_args = Some(flags); self } fn set_opt<P: AsRef<OsStr>>(&mut self, kind: Kind, opt: P, optarg: Option<P>) -> &mut Config { let optarg = optarg.as_ref().map(|v| v.as_ref().to_owned()); self.options.push((kind, opt.as_ref().to_owned(), optarg)); self } /// Passes `--<opt><=optarg>` to configure. pub fn config_option<P: AsRef<OsStr>>(&mut self, opt: P, optarg: Option<P>) -> &mut Config { self.set_opt(Kind::Arbitrary, opt, optarg) } /// Passes `--enable-<opt><=optarg>` to configure. pub fn enable<P: AsRef<OsStr>>(&mut self, opt: P, optarg: Option<P>) -> &mut Config { self.set_opt(Kind::Enable, opt, optarg) } /// Passes `--disable-<opt><=optarg>` to configure. pub fn disable<P: AsRef<OsStr>>(&mut self, opt: P, optarg: Option<P>) -> &mut Config { self.set_opt(Kind::Disable, opt, optarg) } /// Passes `--with-<opt><=optarg>` to configure. pub fn with<P: AsRef<OsStr>>(&mut self, opt: P, optarg: Option<P>) -> &mut Config { self.set_opt(Kind::With, opt, optarg) } /// Passes `--without-<opt><=optarg>` to configure. pub fn without<P: AsRef<OsStr>>(&mut self, opt: P, optarg: Option<P>) -> &mut Config { self.set_opt(Kind::Without, opt, optarg) } /// Adds a custom flag to pass down to the C compiler, supplementing those /// that this library already passes. /// /// Default flags for the chosen compiler have lowest priority, then any /// flags from the environment variable `$CFLAGS`, then any flags specified /// with this method. pub fn cflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config { self.cflags.push(" "); self.cflags.push(flag.as_ref()); self } /// Adds a custom flag to pass down to the C++ compiler, supplementing those /// that this library already passes. /// /// Default flags for the chosen compiler have lowest priority, then any /// flags from the environment variable `$CXXFLAGS`, then any flags specified /// with this method. pub fn cxxflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config { self.cxxflags.push(" "); self.cxxflags.push(flag.as_ref()); self } /// Adds a custom flag to pass down to the linker, supplementing those /// that this library already passes. /// /// Flags from the environment variable `$LDFLAGS` have lowest priority, /// then any flags specified with this method. pub fn ldflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config { self.ldflags.push(" "); self.ldflags.push(flag.as_ref()); self } /// Sets the target triple for this compilation. /// /// This is automatically scraped from `$TARGET` which is set for Cargo /// build scripts so it's not necessary to call this from a build script. /// /// See [Note](#main) on the differences between Rust's and autotools' /// interpretation of "target" (this method assumes the former). pub fn target(&mut self, target: &str) -> &mut Config { self.target = Some(target.to_string()); self } /// Sets the host triple for this compilation. /// /// This is automatically scraped from `$HOST` which is set for Cargo /// build scripts so it's not necessary to call this from a build script. /// /// See [Note](#main) on the differences between Rust's and autotools' /// interpretation of "host" (this method assumes the former). pub fn host(&mut self, host: &str) -> &mut Config { self.host = Some(host.to_string()); self } /// Sets the output directory for this compilation. /// /// This is automatically scraped from `$OUT_DIR` which is set for Cargo /// build scripts so it's not necessary to call this from a build script. pub fn out_dir<P: AsRef<Path>>(&mut self, out: P) -> &mut Config { self.out_dir = Some(out.as_ref().to_path_buf()); self } /// Configure an environment variable for the `configure && make` processes /// spawned by this crate in the `build` step. /// /// If you want to set `$CFLAGS`, `$CXXFLAGS`, or `$LDFLAGS`, consider using the /// [cflag](#method.cflag), /// [cxxflag](#method.cxxflag), or /// [ldflag](#method.ldflag) /// methods instead, which will append to any external /// values. Setting those environment variables here will overwrite the /// external values, and will also discard any flags determined by the chosen /// compiler. /// /// `autotools::Config` will automatically pass `$CC` and `$CXX` values to /// the `configure` script based on the chosen compiler. Setting those /// variables here will override, and interferes with other parts of this /// library, so is not recommended. pub fn env<K, V>(&mut self, key: K, value: V) -> &mut Config where K: AsRef<OsStr>, V: AsRef<OsStr>, { self.env.push((key.as_ref().to_owned(), value.as_ref().to_owned())); self } /// Options to pass through to `autoreconf` prior to configuring the build. pub fn reconf<P: AsRef<OsStr>>(&mut self, flags: P) -> &mut Config { self.reconfig = Some(flags.as_ref().to_os_string()); self } /// Build the given make target. /// /// If this function is not called, the build will default to `make install`. pub fn make_target(&mut self, make_target: &str) -> &mut Config { self.make_targets.get_or_insert_with(Vec::new).push(make_target.to_owned()); self } /// Build the library in-source. /// /// This is generally not recommended, but can be required for libraries that /// make extensive use of nested Makefiles, which cannot be included in /// out-of-source builds. pub fn insource(&mut self, build_insource: bool) -> &mut Config { self.build_insource = build_insource; self } /// Forbid an argument from being added to the configure command. /// /// This can be used to account for non-standard configure scripts. pub fn forbid<T: ToString>(&mut self, arg: T) -> &mut Config { self.forbidden_args.insert(arg.to_string()); self } /// Run this configuration, compiling the library with all the configured /// options. /// /// This will run both the build system generator command as well as the /// command to build the library. pub fn build(&mut self) -> PathBuf { let target = self.target.clone().unwrap_or_else(|| { getenv_unwrap("TARGET") }); let host = self.host.clone().unwrap_or_else(|| { getenv_unwrap("HOST") }); let mut c_cfg = cc::Build::new(); c_cfg.cargo_metadata(false) .target(&target) .warnings(false) .host(&host); let mut cxx_cfg = cc::Build::new(); cxx_cfg.cargo_metadata(false) .cpp(true) .target(&target) .warnings(false) .host(&host); let c_compiler = c_cfg.get_compiler(); let cxx_compiler = cxx_cfg.get_compiler(); let dst; let build; if self.build_insource { dst = self.path.clone(); build = dst.clone(); } else { dst = self.out_dir.clone().unwrap_or_else(|| { PathBuf::from(getenv_unwrap("OUT_DIR")) }); build = dst.join("build"); self.maybe_clear(&build); let _ = fs::create_dir(&build); } // TODO: env overrides? // TODO: PKG_CONFIG_PATH if let Some(ref opts) = self.reconfig { let executable = "autoreconf".to_owned(); let mut cmd = Command::new(executable); cmd.current_dir(&self.path); run(cmd.arg(opts), "autoreconf"); } let mut cmd; let mut program = "configure"; let mut args: Vec<String> = Vec::new(); let executable = PathBuf::from(&self.path).join(program); if target.contains("emscripten") { program = "emconfigure"; cmd = Command::new(program); args.push(executable.to_string_lossy().to_string()); } else { cmd = Command::new(executable); } args.push(format!("--prefix={}", dst.display())); if self.enable_shared { args.push("--enable-shared".to_string()); } else { args.push("--disable-shared".to_string()); } if self.enable_static { args.push("--enable-static".to_string()); } else { args.push("--disable-static".to_string()); } let mut cflags = c_compiler.cflags_env(); match env::var_os("CFLAGS") { None => (), Some(flags) => { cflags.push(" "); cflags.push(&flags); } } if !self.cflags.is_empty() { cflags.push(" "); cflags.push(&self.cflags); } cmd.env("CFLAGS", cflags); let mut cxxflags = cxx_compiler.cflags_env(); match env::var_os("CXXFLAGS") { None => (), Some(flags) => { cxxflags.push(" "); cxxflags.push(&flags); } } if !self.cxxflags.is_empty() { cxxflags.push(" "); cxxflags.push(&self.cxxflags); } cmd.env("CXXFLAGS", cxxflags); if !self.ldflags.is_empty() { match env::var_os("LDFLAGS") { None => cmd.env("LDFLAGS", &self.ldflags), Some(flags) => { let mut os = OsString::from(flags); os.push(" "); os.push(&self.ldflags); cmd.env("LDFLAGS", &os) } }; } let mut config_host = false; for &(ref kind, ref k, ref v) in &self.options { let mut os = OsString::from("--"); match *kind { Kind::Enable => os.push("enable-"), Kind::Disable => os.push("disable-"), Kind::With => os.push("with-"), Kind::Without => os.push("without-"), Kind::Arbitrary => { if k == "host" { config_host = true; } } }; os.push(k); if let &Some(ref v) = v { os.push("="); os.push(v); } args.push(os.to_string_lossy().to_string()); } if !config_host { let compiler_path = format!("--host={}", c_compiler.path().display()); if compiler_path != "--host=musl-gcc" && compiler_path.ends_with("-gcc") { args.push(compiler_path[0..compiler_path.len() - 4].to_string()); } } cmd.env("CC", c_compiler.path().to_str().unwrap()); cmd.env("CXX", cxx_compiler.path().to_str().unwrap()); for &(ref k, ref v) in c_compiler.env().iter().chain(&self.env) { cmd.env(k, v); } for &(ref k, ref v) in cxx_compiler.env().iter().chain(&self.env) { cmd.env(k, v); } cmd.args(args.iter().filter(|x| { !self.forbidden_args.contains(match x.find("=") { Some(idx) => x.split_at(idx).0, None => x.as_str(), }) })); run(cmd.current_dir(&build), program); // Build up the first make command to build the build system. program = "make"; let executable = env::var("MAKE").unwrap_or(program.to_owned()); if target.contains("emscripten") { program = "emmake"; cmd = Command::new("emmake"); cmd.arg(executable); } else { cmd = Command::new(executable); } cmd.current_dir(&build); let mut makeflags = None; let mut make_args = Vec::new(); if let Some(args) = &self.make_args { make_args.extend_from_slice(args); } if let Ok(s) = env::var("NUM_JOBS") { match env::var_os("CARGO_MAKEFLAGS") { // Only do this on non-windows and non-bsd // On Windows, we could be invoking make instead of // mingw32-make which doesn't work with our jobserver // bsdmake also does not work with our job server Some(ref s) if !(cfg!(windows) || cfg!(target_os = "openbsd") || cfg!(target_os = "netbsd") || cfg!(target_os = "freebsd") || cfg!(target_os = "bitrig") || cfg!(target_os = "dragonflybsd") ) => makeflags = Some(s.clone()), // This looks like `make`, let's hope it understands `-jN`. _ => make_args.push(format!("-j{}", s)), } } // And build! let make_targets = self.make_targets .get_or_insert(vec!["install".to_string()]); if let Some(flags) = makeflags { cmd.env("MAKEFLAGS", flags); } run(cmd.args(make_targets) .args(&make_args) .current_dir(&build), program); println!("cargo:root={}", dst.display()); dst } fn maybe_clear(&self, _dir: &Path) { // TODO: make clean? } } fn run(cmd: &mut Command, program: &str) { println!("running: {:?}", cmd); let status = match cmd.status() { Ok(status) => status, Err(ref e) if e.kind() == ErrorKind::NotFound => { fail(&format!("failed to execute command: {}\nis `{}` not installed?", e, program)); } Err(e) => fail(&format!("failed to execute command: {}", e)), }; if !status.success() { fail(&format!("command did not execute successfully, got: {}", status)); } } fn getenv_unwrap(v: &str) -> String { match env::var(v) { Ok(s) => s, Err(..) => fail(&format!("environment variable `{}` not defined", v)), } } fn fail(s: &str) -> ! { panic!("\n{}\n\nbuild script failed, must exit now", s) }