diff options
Diffstat (limited to 'pkg-config/src/lib.rs')
| -rw-r--r-- | pkg-config/src/lib.rs | 250 |
1 files changed, 185 insertions, 65 deletions
diff --git a/pkg-config/src/lib.rs b/pkg-config/src/lib.rs index c88bd34..88dd310 100644 --- a/pkg-config/src/lib.rs +++ b/pkg-config/src/lib.rs @@ -61,38 +61,36 @@ //! } //! ``` -#![doc(html_root_url = "http://alexcrichton.com/pkg-config-rs")] -#![cfg_attr(test, deny(warnings))] +#![doc(html_root_url = "https://docs.rs/pkg-config/0.3")] +#[allow(unused_imports)] // Required for Rust <1.23 use std::ascii::AsciiExt; +use std::collections::HashMap; use std::env; use std::error; use std::ffi::{OsStr, OsString}; use std::fmt; -use std::fs; use std::io; use std::path::{PathBuf, Path}; use std::process::{Command, Output}; use std::str; pub fn target_supported() -> bool { - let target = env::var("TARGET").unwrap_or(String::new()); - let host = env::var("HOST").unwrap_or(String::new()); + let target = env::var("TARGET").unwrap_or_else(|_| String::new()); + let host = env::var("HOST").unwrap_or_else(|_| String::new()); // Only use pkg-config in host == target situations by default (allowing an - // override) and then also don't use pkg-config on MSVC as it's really not - // meant to work there but when building MSVC code in a MSYS shell we may be - // able to run pkg-config anyway. - (host == target || env::var_os("PKG_CONFIG_ALLOW_CROSS").is_some()) && - !target.contains("msvc") + // override). + (host == target || env::var_os("PKG_CONFIG_ALLOW_CROSS").is_some()) } -#[derive(Clone)] +#[derive(Clone, Default)] pub struct Config { statik: Option<bool>, atleast_version: Option<String>, extra_args: Vec<OsString>, cargo_metadata: bool, + env_metadata: bool, print_system_libs: bool, } @@ -103,6 +101,7 @@ pub struct Library { pub frameworks: Vec<String>, pub framework_paths: Vec<PathBuf>, pub include_paths: Vec<PathBuf>, + pub defines: HashMap<String, Option<String>>, pub version: String, _priv: (), } @@ -119,9 +118,6 @@ pub enum Error { /// Override with `PKG_CONFIG_ALLOW_CROSS=1`. CrossCompilation, - /// Attempted to compile using the MSVC ABI build - MSVC, - /// Failed to run `pkg-config`. /// /// Contains the command and the cause. @@ -145,7 +141,6 @@ impl error::Error for Error { "pkg-config doesn't handle cross compilation. \ Use PKG_CONFIG_ALLOW_CROSS=1 to override" } - Error::MSVC => "pkg-config is incompatible with the MSVC ABI build.", Error::Command { .. } => "failed to run pkg-config", Error::Failure { .. } => "pkg-config did not exit sucessfully", Error::__Nonexhaustive => panic!(), @@ -196,7 +191,6 @@ impl fmt::Debug for Error { .finish() } Error::CrossCompilation => write!(f, "CrossCompilation"), - Error::MSVC => write!(f, "MSVC"), Error::Command { ref command, ref cause } => { f.debug_struct("Command") .field("command", command) @@ -224,22 +218,18 @@ impl fmt::Display for Error { write!(f, "Cross compilation detected. \ Use PKG_CONFIG_ALLOW_CROSS=1 to override") } - Error::MSVC => { - write!(f, "MSVC target detected. If you are using the MSVC ABI \ - rust build, please use the GNU ABI build instead.") - } Error::Command { ref command, ref cause } => { write!(f, "Failed to run `{}`: {}", command, cause) } Error::Failure { ref command, ref output } => { let stdout = str::from_utf8(&output.stdout).unwrap(); let stderr = str::from_utf8(&output.stderr).unwrap(); - try!(write!(f, "`{}` did not exit successfully: {}", command, output.status)); + write!(f, "`{}` did not exit successfully: {}", command, output.status)?; if !stdout.is_empty() { - try!(write!(f, "\n--- stdout\n{}", stdout)); + write!(f, "\n--- stdout\n{}", stdout)?; } if !stderr.is_empty() { - try!(write!(f, "\n--- stderr\n{}", stderr)); + write!(f, "\n--- stderr\n{}", stderr)?; } Ok(()) } @@ -264,7 +254,8 @@ pub fn probe_library(name: &str) -> Result<Library, Error> { pub fn get_variable(package: &str, variable: &str) -> Result<String, Error> { let arg = format!("--variable={}", variable); let cfg = Config::new(); - Ok(try!(run(cfg.command(package, &[&arg]))).trim_right().to_owned()) + let out = run(cfg.command(package, &[&arg]))?; + Ok(str::from_utf8(&out).unwrap().trim_right().to_owned()) } impl Config { @@ -277,6 +268,7 @@ impl Config { extra_args: vec![], print_system_libs: true, cargo_metadata: true, + env_metadata: false, } } @@ -310,6 +302,14 @@ impl Config { self } + /// Define whether metadata should be emitted for cargo allowing to + /// automatically rebuild when environment variables change. Defaults to + /// `false`. + pub fn env_metadata(&mut self, env_metadata: bool) -> &mut Config { + self.env_metadata = env_metadata; + self + } + /// Enable or disable the `PKG_CONFIG_ALLOW_SYSTEM_LIBS` environment /// variable. /// @@ -331,24 +331,19 @@ impl Config { /// `pkg-config` is run. pub fn probe(&self, name: &str) -> Result<Library, Error> { let abort_var_name = format!("{}_NO_PKG_CONFIG", envify(name)); - if env::var_os(&abort_var_name).is_some() { + if self.env_var_os(&abort_var_name).is_some() { return Err(Error::EnvNoPkgConfig(abort_var_name)) } else if !target_supported() { - if env::var("TARGET").unwrap_or(String::new()).contains("msvc") { - return Err(Error::MSVC); - } - else { - return Err(Error::CrossCompilation); - } + return Err(Error::CrossCompilation); } let mut library = Library::new(); - let output = try!(run(self.command(name, &["--libs", "--cflags"]))); + let output = run(self.command(name, &["--libs", "--cflags"]))?; library.parse_libs_cflags(name, &output, self); - let output = try!(run(self.command(name, &["--modversion"]))); - library.parse_modversion(&output); + let output = run(self.command(name, &["--modversion"]))?; + library.parse_modversion(str::from_utf8(&output).unwrap()); Ok(library) } @@ -359,12 +354,41 @@ impl Config { get_variable(package, variable).map_err(|e| e.to_string()) } + fn targetted_env_var(&self, var_base: &str) -> Result<String, env::VarError> { + if let Ok(target) = env::var("TARGET") { + let host = env::var("HOST")?; + let kind = if host == target { "HOST" } else { "TARGET" }; + let target_u = target.replace("-", "_"); + + self.env_var(&format!("{}_{}", var_base, target)) + .or_else(|_| self.env_var(&format!("{}_{}", var_base, target_u))) + .or_else(|_| self.env_var(&format!("{}_{}", kind, var_base))) + .or_else(|_| self.env_var(var_base)) + } else { + self.env_var(var_base) + } + } + + fn env_var(&self, name: &str) -> Result<String, env::VarError> { + if self.env_metadata { + println!("cargo:rerun-if-env-changed={}", name); + } + env::var(name) + } + + fn env_var_os(&self, name: &str) -> Option<OsString> { + if self.env_metadata { + println!("cargo:rerun-if-env-changed={}", name); + } + env::var_os(name) + } + fn is_static(&self, name: &str) -> bool { - self.statik.unwrap_or_else(|| infer_static(name)) + self.statik.unwrap_or_else(|| self.infer_static(name)) } fn command(&self, name: &str, args: &[&str]) -> Command { - let exe = env::var("PKG_CONFIG").unwrap_or(String::from("pkg-config")); + let exe = self.env_var("PKG_CONFIG").unwrap_or_else(|_| String::from("pkg-config")); let mut cmd = Command::new(exe); if self.is_static(name) { cmd.arg("--static"); @@ -372,6 +396,15 @@ impl Config { cmd.args(args) .args(&self.extra_args); + if let Ok(value) = self.targetted_env_var("PKG_CONFIG_PATH") { + cmd.env("PKG_CONFIG_PATH", value); + } + if let Ok(value) = self.targetted_env_var("PKG_CONFIG_LIBDIR") { + cmd.env("PKG_CONFIG_LIBDIR", value); + } + if let Ok(value) = self.targetted_env_var("PKG_CONFIG_SYSROOT_DIR") { + cmd.env("PKG_CONFIG_SYSROOT_DIR", value); + } if self.print_system_libs { cmd.env("PKG_CONFIG_ALLOW_SYSTEM_LIBS", "1"); } @@ -388,6 +421,21 @@ impl Config { println!("cargo:{}", s); } } + + fn infer_static(&self, name: &str) -> bool { + let name = envify(name); + if self.env_var_os(&format!("{}_STATIC", name)).is_some() { + true + } else if self.env_var_os(&format!("{}_DYNAMIC", name)).is_some() { + false + } else if self.env_var_os("PKG_CONFIG_ALL_STATIC").is_some() { + true + } else if self.env_var_os("PKG_CONFIG_ALL_DYNAMIC").is_some() { + false + } else { + false + } + } } impl Library { @@ -398,21 +446,29 @@ impl Library { include_paths: Vec::new(), frameworks: Vec::new(), framework_paths: Vec::new(), + defines: HashMap::new(), version: String::new(), _priv: (), } } - fn parse_libs_cflags(&mut self, name: &str, output: &str, config: &Config) { - let parts = output.trim_right() - .split(' ') + fn parse_libs_cflags(&mut self, name: &str, output: &[u8], config: &Config) { + let mut is_msvc = false; + if let Ok(target) = env::var("TARGET") { + if target.contains("msvc") { + is_msvc = true; + } + } + + let words = split_flags(output); + let parts = words.iter() .filter(|l| l.len() > 2) .map(|arg| (&arg[0..2], &arg[2..])) .collect::<Vec<_>>(); let mut dirs = Vec::new(); let statik = config.is_static(name); - for &(flag, val) in parts.iter() { + for &(flag, val) in &parts { match flag { "-L" => { let meta = format!("rustc-link-search=native={}", val); @@ -429,20 +485,35 @@ impl Library { self.include_paths.push(PathBuf::from(val)); } "-l" => { - self.libs.push(val.to_string()); - if statik && !is_system(val, &dirs) { + // These are provided by the CRT with MSVC + if is_msvc && ["m", "c", "pthread"].contains(&val) { + continue; + } + + if statik && is_static_available(val, &dirs) { let meta = format!("rustc-link-lib=static={}", val); config.print_metadata(&meta); } else { let meta = format!("rustc-link-lib={}", val); config.print_metadata(&meta); } + + self.libs.push(val.to_string()); + } + "-D" => { + let mut iter = val.split("="); + self.defines.insert(iter.next().unwrap().to_owned(), iter.next().map(|s| s.to_owned())); } _ => {} } } - let mut iter = output.trim_right().split(' '); + let mut iter = words.iter() + .flat_map(|arg| if arg.starts_with("-Wl,") { + arg[4..].split(',').collect() + } else { + vec![arg.as_ref()] + }); while let Some(part) = iter.next() { if part != "-framework" { continue @@ -460,41 +531,32 @@ impl Library { } } -fn infer_static(name: &str) -> bool { - let name = envify(name); - if env::var_os(&format!("{}_STATIC", name)).is_some() { - true - } else if env::var_os(&format!("{}_DYNAMIC", name)).is_some() { - false - } else if env::var_os("PKG_CONFIG_ALL_STATIC").is_some() { - true - } else if env::var_os("PKG_CONFIG_ALL_DYNAMIC").is_some() { - false - } else { - false - } -} - fn envify(name: &str) -> String { name.chars().map(|c| c.to_ascii_uppercase()).map(|c| { if c == '-' {'_'} else {c} }).collect() } -fn is_system(name: &str, dirs: &[PathBuf]) -> bool { +/// System libraries should only be linked dynamically +fn is_static_available(name: &str, dirs: &[PathBuf]) -> bool { let libname = format!("lib{}.a", name); - let root = Path::new("/usr"); - !dirs.iter().any(|d| { - !d.starts_with(root) && fs::metadata(&d.join(&libname)).is_ok() + let system_roots = if cfg!(target_os = "macos") { + vec![Path::new("/Library"), Path::new("/System")] + } else { + vec![Path::new("/usr")] + }; + + dirs.iter().any(|dir| { + !system_roots.iter().any(|sys| dir.starts_with(sys)) && + dir.join(&libname).exists() }) } -fn run(mut cmd: Command) -> Result<String, Error> { +fn run(mut cmd: Command) -> Result<Vec<u8>, Error> { match cmd.output() { Ok(output) => { if output.status.success() { - let stdout = String::from_utf8(output.stdout).unwrap(); - Ok(stdout) + Ok(output.stdout) } else { Err(Error::Failure { command: format!("{:?}", cmd), @@ -508,3 +570,61 @@ fn run(mut cmd: Command) -> Result<String, Error> { }), } } + +/// Split output produced by pkg-config --cflags and / or --libs into separate flags. +/// +/// Backslash in output is used to preserve literal meaning of following byte. Different words are +/// separated by unescaped space. Other whitespace characters generally should not occur unescaped +/// at all, apart from the newline at the end of output. For compatibility with what others +/// consumers of pkg-config output would do in this scenario, they are used here for splitting as +/// well. +fn split_flags(output: &[u8]) -> Vec<String> { + let mut word = Vec::new(); + let mut words = Vec::new(); + let mut escaped = false; + + for &b in output { + match b { + _ if escaped => { + escaped = false; + word.push(b); + } + b'\\' => { + escaped = true + } + b'\t' | b'\n' | b'\r' | b' ' => { + if !word.is_empty() { + words.push(String::from_utf8(word).unwrap()); + word = Vec::new(); + } + } + _ => word.push(b), + } + } + + if !word.is_empty() { + words.push(String::from_utf8(word).unwrap()); + } + + words +} + +#[test] +#[cfg(target_os = "macos")] +fn system_library_mac_test() { + assert!(!is_static_available("PluginManager", &[PathBuf::from("/Library/Frameworks")])); + assert!(!is_static_available("python2.7", &[PathBuf::from("/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config")])); + assert!(!is_static_available("ffi_convenience", &[PathBuf::from("/Library/Ruby/Gems/2.0.0/gems/ffi-1.9.10/ext/ffi_c/libffi-x86_64/.libs")])); + + // Homebrew is in /usr/local, and it's not a part of the OS + if Path::new("/usr/local/lib/libpng16.a").exists() { + assert!(is_static_available("png16", &[PathBuf::from("/usr/local/lib")])); + } +} + +#[test] +#[cfg(target_os = "linux")] +fn system_library_linux_test() { + assert!(!is_static_available("util", &[PathBuf::from("/usr/lib/x86_64-linux-gnu")])); + assert!(!is_static_available("dialog", &[PathBuf::from("/usr/lib")])); +} |