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#![doc(html_root_url = "https://docs.rs/pkg-config/0.3")]
use std::collections::HashMap;
use std::env;
use std::error;
use std::ffi::{OsStr, OsString};
use std::fmt;
use std::io;
use std::ops::{Bound, RangeBounds};
use std::path::PathBuf;
use std::process::{Command, Output};
use std::str;
#[derive(Clone, Debug)]
pub struct Config {
statik: Option<bool>,
min_version: Bound<String>,
max_version: Bound<String>,
extra_args: Vec<OsString>,
cargo_metadata: bool,
env_metadata: bool,
print_system_libs: bool,
print_system_cflags: bool,
}
#[derive(Clone, Debug)]
pub struct Library {
pub libs: Vec<String>,
pub link_paths: Vec<PathBuf>,
pub link_files: Vec<PathBuf>,
pub frameworks: Vec<String>,
pub framework_paths: Vec<PathBuf>,
pub include_paths: Vec<PathBuf>,
pub ld_args: Vec<Vec<String>>,
pub defines: HashMap<String, Option<String>>,
pub version: String,
_priv: (),
}
pub enum Error {
EnvNoPkgConfig(String),
CrossCompilation,
Command { command: String, cause: io::Error },
Failure { command: String, output: Output },
ProbeFailure {
name: String,
command: String,
output: Output,
},
#[doc(hidden)]
__Nonexhaustive,
}
impl error::Error for Error {}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
<Error as fmt::Display>::fmt(self, f)
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
Error::EnvNoPkgConfig(ref name) => write!(f, "Aborted because {} is set", name),
Error::CrossCompilation => f.write_str(
"pkg-config has not been configured to support cross-compilation.\n\
\n\
Install a sysroot for the target platform and configure it via\n\
PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a\n\
cross-compiling wrapper for pkg-config and set it via\n\
PKG_CONFIG environment variable.",
),
Error::Command {
ref command,
ref cause,
} => {
match cause.kind() {
io::ErrorKind::NotFound => {
let crate_name =
std::env::var("CARGO_PKG_NAME").unwrap_or_else(|_| "sys".to_owned());
let instructions = if cfg!(target_os = "macos") || cfg!(target_os = "ios") {
"Try `brew install pkg-config` if you have Homebrew.\n"
} else if cfg!(unix) {
"Try `apt install pkg-config`, or `yum install pkg-config`,\n\
or `pkg install pkg-config`, or `apk add pkgconfig` \
depending on your distribution.\n"
} else {
"" };
write!(f, "Could not run `{command}`\n\
The pkg-config command could not be found.\n\
\n\
Most likely, you need to install a pkg-config package for your OS.\n\
{instructions}\
\n\
If you've already installed it, ensure the pkg-config command is one of the\n\
directories in the PATH environment variable.\n\
\n\
If you did not expect this build to link to a pre-installed system library,\n\
then check documentation of the {crate_name} crate for an option to\n\
build the library from source, or disable features or dependencies\n\
that require pkg-config.", command = command, instructions = instructions, crate_name = crate_name)
}
_ => write!(f, "Failed to run command `{}`, because: {}", command, cause),
}
}
Error::ProbeFailure {
ref name,
ref command,
ref output,
} => {
write!(
f,
"`{}` did not exit successfully: {}\nerror: could not find system library '{}' required by the '{}' crate\n",
command, output.status, name, env::var("CARGO_PKG_NAME").unwrap_or_default(),
)?;
format_output(output, f)
}
Error::Failure {
ref command,
ref output,
} => {
write!(
f,
"`{}` did not exit successfully: {}",
command, output.status
)?;
format_output(output, f)
}
Error::__Nonexhaustive => panic!(),
}
}
}
fn format_output(output: &Output, f: &mut fmt::Formatter) -> fmt::Result {
let stdout = String::from_utf8_lossy(&output.stdout);
if !stdout.is_empty() {
write!(f, "\n--- stdout\n{}", stdout)?;
}
let stderr = String::from_utf8_lossy(&output.stderr);
if !stderr.is_empty() {
write!(f, "\n--- stderr\n{}", stderr)?;
}
Ok(())
}
#[doc(hidden)]
pub fn find_library(name: &str) -> Result<Library, String> {
probe_library(name).map_err(|e| e.to_string())
}
pub fn probe_library(name: &str) -> Result<Library, Error> {
Config::new().probe(name)
}
#[doc(hidden)]
#[deprecated(note = "use config.target_supported() instance method instead")]
pub fn target_supported() -> bool {
Config::new().target_supported()
}
pub fn get_variable(package: &str, variable: &str) -> Result<String, Error> {
let arg = format!("--variable={}", variable);
let cfg = Config::new();
let out = run(cfg.command(package, &[&arg]))?;
Ok(str::from_utf8(&out).unwrap().trim_end().to_owned())
}
impl Config {
pub fn new() -> Config {
Config {
statik: None,
min_version: Bound::Unbounded,
max_version: Bound::Unbounded,
extra_args: vec![],
print_system_cflags: true,
print_system_libs: true,
cargo_metadata: true,
env_metadata: true,
}
}
pub fn statik(&mut self, statik: bool) -> &mut Config {
self.statik = Some(statik);
self
}
pub fn atleast_version(&mut self, vers: &str) -> &mut Config {
self.min_version = Bound::Included(vers.to_string());
self.max_version = Bound::Unbounded;
self
}
pub fn exactly_version(&mut self, vers: &str) -> &mut Config {
self.min_version = Bound::Included(vers.to_string());
self.max_version = Bound::Included(vers.to_string());
self
}
pub fn range_version<'a, R>(&mut self, range: R) -> &mut Config
where
R: RangeBounds<&'a str>,
{
self.min_version = match range.start_bound() {
Bound::Included(vers) => Bound::Included(vers.to_string()),
Bound::Excluded(vers) => Bound::Excluded(vers.to_string()),
Bound::Unbounded => Bound::Unbounded,
};
self.max_version = match range.end_bound() {
Bound::Included(vers) => Bound::Included(vers.to_string()),
Bound::Excluded(vers) => Bound::Excluded(vers.to_string()),
Bound::Unbounded => Bound::Unbounded,
};
self
}
pub fn arg<S: AsRef<OsStr>>(&mut self, arg: S) -> &mut Config {
self.extra_args.push(arg.as_ref().to_os_string());
self
}
pub fn cargo_metadata(&mut self, cargo_metadata: bool) -> &mut Config {
self.cargo_metadata = cargo_metadata;
self
}
pub fn env_metadata(&mut self, env_metadata: bool) -> &mut Config {
self.env_metadata = env_metadata;
self
}
pub fn print_system_libs(&mut self, print: bool) -> &mut Config {
self.print_system_libs = print;
self
}
pub fn print_system_cflags(&mut self, print: bool) -> &mut Config {
self.print_system_cflags = print;
self
}
#[doc(hidden)]
pub fn find(&self, name: &str) -> Result<Library, String> {
self.probe(name).map_err(|e| e.to_string())
}
pub fn probe(&self, name: &str) -> Result<Library, Error> {
let abort_var_name = format!("{}_NO_PKG_CONFIG", envify(name));
if self.env_var_os(&abort_var_name).is_some() {
return Err(Error::EnvNoPkgConfig(abort_var_name));
} else if !self.target_supported() {
return Err(Error::CrossCompilation);
}
let mut library = Library::new();
let output = run(self.command(name, &["--libs", "--cflags"])).map_err(|e| match e {
Error::Failure { command, output } => Error::ProbeFailure {
name: name.to_owned(),
command,
output,
},
other => other,
})?;
library.parse_libs_cflags(name, &output, self);
let output = run(self.command(name, &["--modversion"]))?;
library.parse_modversion(str::from_utf8(&output).unwrap());
Ok(library)
}
pub fn target_supported(&self) -> bool {
let target = env::var_os("TARGET").unwrap_or_default();
let host = env::var_os("HOST").unwrap_or_default();
if host == target {
return true;
}
match self.targetted_env_var("PKG_CONFIG_ALLOW_CROSS") {
Some(ref val) if val == "0" => false,
Some(_) => true,
None => {
self.targetted_env_var("PKG_CONFIG").is_some()
|| self.targetted_env_var("PKG_CONFIG_SYSROOT_DIR").is_some()
}
}
}
#[doc(hidden)]
pub fn get_variable(package: &str, variable: &str) -> Result<String, String> {
get_variable(package, variable).map_err(|e| e.to_string())
}
fn targetted_env_var(&self, var_base: &str) -> Option<OsString> {
match (env::var("TARGET"), env::var("HOST")) {
(Ok(target), Ok(host)) => {
let kind = if host == target { "HOST" } else { "TARGET" };
let target_u = target.replace("-", "_");
self.env_var_os(&format!("{}_{}", var_base, target))
.or_else(|| self.env_var_os(&format!("{}_{}", var_base, target_u)))
.or_else(|| self.env_var_os(&format!("{}_{}", kind, var_base)))
.or_else(|| self.env_var_os(var_base))
}
(Err(env::VarError::NotPresent), _) | (_, Err(env::VarError::NotPresent)) => {
self.env_var_os(var_base)
}
(Err(env::VarError::NotUnicode(s)), _) | (_, Err(env::VarError::NotUnicode(s))) => {
panic!(
"HOST or TARGET environment variable is not valid unicode: {:?}",
s
)
}
}
}
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(|| self.infer_static(name))
}
fn command(&self, name: &str, args: &[&str]) -> Command {
let exe = self
.targetted_env_var("PKG_CONFIG")
.unwrap_or_else(|| OsString::from("pkg-config"));
let mut cmd = Command::new(exe);
if self.is_static(name) {
cmd.arg("--static");
}
cmd.args(args).args(&self.extra_args);
if let Some(value) = self.targetted_env_var("PKG_CONFIG_PATH") {
cmd.env("PKG_CONFIG_PATH", value);
}
if let Some(value) = self.targetted_env_var("PKG_CONFIG_LIBDIR") {
cmd.env("PKG_CONFIG_LIBDIR", value);
}
if let Some(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");
}
if self.print_system_cflags {
cmd.env("PKG_CONFIG_ALLOW_SYSTEM_CFLAGS", "1");
}
cmd.arg(name);
match self.min_version {
Bound::Included(ref version) => {
cmd.arg(&format!("{} >= {}", name, version));
}
Bound::Excluded(ref version) => {
cmd.arg(&format!("{} > {}", name, version));
}
_ => (),
}
match self.max_version {
Bound::Included(ref version) => {
cmd.arg(&format!("{} <= {}", name, version));
}
Bound::Excluded(ref version) => {
cmd.arg(&format!("{} < {}", name, version));
}
_ => (),
}
cmd
}
fn print_metadata(&self, s: &str) {
if self.cargo_metadata {
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 Default for Config {
fn default() -> Config {
Config {
statik: None,
min_version: Bound::Unbounded,
max_version: Bound::Unbounded,
extra_args: vec![],
print_system_cflags: false,
print_system_libs: false,
cargo_metadata: false,
env_metadata: false,
}
}
}
impl Library {
fn new() -> Library {
Library {
libs: Vec::new(),
link_paths: Vec::new(),
link_files: Vec::new(),
include_paths: Vec::new(),
ld_args: Vec::new(),
frameworks: Vec::new(),
framework_paths: Vec::new(),
defines: HashMap::new(),
version: String::new(),
_priv: (),
}
}
fn extract_lib_from_filename<'a>(target: &str, filename: &'a str) -> Option<&'a str> {
fn test_suffixes<'b>(filename: &'b str, suffixes: &[&str]) -> Option<&'b str> {
for suffix in suffixes {
if filename.ends_with(suffix) {
return Some(&filename[..filename.len() - suffix.len()]);
}
}
None
}
let prefix = "lib";
if target.contains("msvc") {
return test_suffixes(filename, &[".lib"]);
} else if target.contains("windows") && target.contains("gnu") {
if filename.starts_with(prefix) {
let filename = &filename[prefix.len()..];
return test_suffixes(filename, &[".dll.a", ".dll", ".lib", ".a"]);
} else {
return test_suffixes(filename, &[".dll.a", ".dll", ".lib"]);
}
} else if target.contains("apple") {
if filename.starts_with(prefix) {
let filename = &filename[prefix.len()..];
return test_suffixes(filename, &[".a", ".so", ".dylib"]);
}
return None;
} else {
if filename.starts_with(prefix) {
let filename = &filename[prefix.len()..];
return test_suffixes(filename, &[".a", ".so"]);
}
return None;
}
}
fn parse_libs_cflags(&mut self, name: &str, output: &[u8], config: &Config) {
let mut is_msvc = false;
let target = env::var("TARGET");
if let Ok(target) = &target {
if target.contains("msvc") {
is_msvc = true;
}
}
let system_roots = if cfg!(target_os = "macos") {
vec![PathBuf::from("/Library"), PathBuf::from("/System")]
} else {
let sysroot = config
.env_var_os("PKG_CONFIG_SYSROOT_DIR")
.or_else(|| config.env_var_os("SYSROOT"))
.map(PathBuf::from);
if cfg!(target_os = "windows") {
if let Some(sysroot) = sysroot {
vec![sysroot]
} else {
vec![]
}
} else {
vec![sysroot.unwrap_or_else(|| PathBuf::from("/usr"))]
}
};
let mut dirs = Vec::new();
let statik = config.is_static(name);
let words = split_flags(output);
let parts = words
.iter()
.filter(|l| l.len() > 2)
.map(|arg| (&arg[0..2], &arg[2..]));
for (flag, val) in parts {
match flag {
"-L" => {
let meta = format!("rustc-link-search=native={}", val);
config.print_metadata(&meta);
dirs.push(PathBuf::from(val));
self.link_paths.push(PathBuf::from(val));
}
"-F" => {
let meta = format!("rustc-link-search=framework={}", val);
config.print_metadata(&meta);
self.framework_paths.push(PathBuf::from(val));
}
"-I" => {
self.include_paths.push(PathBuf::from(val));
}
"-l" => {
if is_msvc && ["m", "c", "pthread"].contains(&val) {
continue;
}
if statik && is_static_available(val, &system_roots, &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 = 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() {
match part {
"-framework" => {
if let Some(lib) = iter.next() {
let meta = format!("rustc-link-lib=framework={}", lib);
config.print_metadata(&meta);
self.frameworks.push(lib.to_string());
}
}
"-isystem" | "-iquote" | "-idirafter" => {
if let Some(inc) = iter.next() {
self.include_paths.push(PathBuf::from(inc));
}
}
_ => {
let path = std::path::Path::new(part);
if path.is_file() {
if let (Some(dir), Some(file_name), Ok(target)) =
(path.parent(), path.file_name(), &target)
{
match Self::extract_lib_from_filename(
target,
&file_name.to_string_lossy(),
) {
Some(lib_basename) => {
let link_search =
format!("rustc-link-search={}", dir.display());
config.print_metadata(&link_search);
let link_lib = format!("rustc-link-lib={}", lib_basename);
config.print_metadata(&link_lib);
self.link_files.push(PathBuf::from(path));
}
None => {
println!("cargo:warning=File path {} found in pkg-config file for {}, but could not extract library base name to pass to linker command line", path.display(), name);
}
}
}
}
}
}
}
let mut linker_options = words.iter().filter(|arg| arg.starts_with("-Wl,"));
while let Some(option) = linker_options.next() {
let mut pop = false;
let mut ld_option = vec![];
for subopt in option[4..].split(',') {
if pop {
pop = false;
continue;
}
if subopt == "-framework" {
pop = true;
continue;
}
ld_option.push(subopt);
}
let meta = format!("rustc-link-arg=-Wl,{}", ld_option.join(","));
config.print_metadata(&meta);
self.ld_args
.push(ld_option.into_iter().map(String::from).collect());
}
}
fn parse_modversion(&mut self, output: &str) {
self.version.push_str(output.lines().nth(0).unwrap().trim());
}
}
fn envify(name: &str) -> String {
name.chars()
.map(|c| c.to_ascii_uppercase())
.map(|c| if c == '-' { '_' } else { c })
.collect()
}
fn is_static_available(name: &str, system_roots: &[PathBuf], dirs: &[PathBuf]) -> bool {
let libname = format!("lib{}.a", name);
dirs.iter().any(|dir| {
!system_roots.iter().any(|sys| dir.starts_with(sys)) && dir.join(&libname).exists()
})
}
fn run(mut cmd: Command) -> Result<Vec<u8>, Error> {
match cmd.output() {
Ok(output) => {
if output.status.success() {
Ok(output.stdout)
} else {
Err(Error::Failure {
command: format!("{:?}", cmd),
output,
})
}
}
Err(cause) => Err(Error::Command {
command: format!("{:?}", cmd),
cause,
}),
}
}
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
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[cfg(target_os = "macos")]
fn system_library_mac_test() {
use std::path::Path;
let system_roots = vec![PathBuf::from("/Library"), PathBuf::from("/System")];
assert!(!is_static_available(
"PluginManager",
&system_roots,
&[PathBuf::from("/Library/Frameworks")]
));
assert!(!is_static_available(
"python2.7",
&system_roots,
&[PathBuf::from(
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config"
)]
));
assert!(!is_static_available(
"ffi_convenience",
&system_roots,
&[PathBuf::from(
"/Library/Ruby/Gems/2.0.0/gems/ffi-1.9.10/ext/ffi_c/libffi-x86_64/.libs"
)]
));
if Path::new("/usr/local/lib/libpng16.a").exists() {
assert!(is_static_available(
"png16",
&system_roots,
&[PathBuf::from("/usr/local/lib")]
));
let libpng = Config::new()
.range_version("1".."99")
.probe("libpng16")
.unwrap();
assert!(libpng.version.find('\n').is_none());
}
}
#[test]
#[cfg(target_os = "linux")]
fn system_library_linux_test() {
assert!(!is_static_available(
"util",
&[PathBuf::from("/usr")],
&[PathBuf::from("/usr/lib/x86_64-linux-gnu")]
));
assert!(!is_static_available(
"dialog",
&[PathBuf::from("/usr")],
&[PathBuf::from("/usr/lib")]
));
}
fn test_library_filename(target: &str, filename: &str) {
assert_eq!(
Library::extract_lib_from_filename(target, filename),
Some("foo")
);
}
#[test]
fn link_filename_linux() {
let target = "x86_64-unknown-linux-gnu";
test_library_filename(target, "libfoo.a");
test_library_filename(target, "libfoo.so");
}
#[test]
fn link_filename_apple() {
let target = "x86_64-apple-darwin";
test_library_filename(target, "libfoo.a");
test_library_filename(target, "libfoo.so");
test_library_filename(target, "libfoo.dylib");
}
#[test]
fn link_filename_msvc() {
let target = "x86_64-pc-windows-msvc";
test_library_filename(target, "foo.lib");
}
#[test]
fn link_filename_mingw() {
let target = "x86_64-pc-windows-gnu";
test_library_filename(target, "foo.lib");
test_library_filename(target, "libfoo.a");
test_library_filename(target, "foo.dll");
test_library_filename(target, "foo.dll.a");
}
}