1 //! A build dependency for Cargo libraries to find system artifacts through the
2 //! `pkg-config` utility.
3 //!
4 //! This library will shell out to `pkg-config` as part of build scripts and
5 //! probe the system to determine how to link to a specified library. The
6 //! `Config` structure serves as a method of configuring how `pkg-config` is
7 //! invoked in a builder style.
8 //!
9 //! A number of environment variables are available to globally configure how
10 //! this crate will invoke `pkg-config`:
11 //!
12 //! * `PKG_CONFIG_ALLOW_CROSS` - if this variable is not set, then `pkg-config`
13 //! will automatically be disabled for all cross compiles.
14 //! * `FOO_NO_PKG_CONFIG` - if set, this will disable running `pkg-config` when
15 //! probing for the library named `foo`.
16 //!
17 //! There are also a number of environment variables which can configure how a
18 //! library is linked to (dynamically vs statically). These variables control
19 //! whether the `--static` flag is passed. Note that this behavior can be
20 //! overridden by configuring explicitly on `Config`. The variables are checked
21 //! in the following order:
22 //!
23 //! * `FOO_STATIC` - pass `--static` for the library `foo`
24 //! * `FOO_DYNAMIC` - do not pass `--static` for the library `foo`
25 //! * `PKG_CONFIG_ALL_STATIC` - pass `--static` for all libraries
26 //! * `PKG_CONFIG_ALL_DYNAMIC` - do not pass `--static` for all libraries
27 //!
28 //! After running `pkg-config` all appropriate Cargo metadata will be printed on
29 //! stdout if the search was successful.
30 //!
31 //! # Example
32 //!
33 //! Find the system library named `foo`, with minimum version 1.2.3:
34 //!
35 //! ```no_run
36 //! extern crate pkg_config;
37 //!
38 //! fn main() {
39 //! pkg_config::Config::new().atleast_version("1.2.3").probe("foo").unwrap();
40 //! }
41 //! ```
42 //!
43 //! Find the system library named `foo`, with no version requirement (not
44 //! recommended):
45 //!
46 //! ```no_run
47 //! extern crate pkg_config;
48 //!
49 //! fn main() {
50 //! pkg_config::probe_library("foo").unwrap();
51 //! }
52 //! ```
53 //!
54 //! Configure how library `foo` is linked to.
55 //!
56 //! ```no_run
57 //! extern crate pkg_config;
58 //!
59 //! fn main() {
60 //! pkg_config::Config::new().atleast_version("1.2.3").statik(true).probe("foo").unwrap();
61 //! }
62 //! ```
63
64 #![doc(html_root_url = "https://docs.rs/pkg-config/0.3")]
65
66 use std::collections::HashMap;
67 use std::env;
68 use std::error;
69 use std::ffi::{OsStr, OsString};
70 use std::fmt;
71 use std::io;
72 use std::ops::{Bound, RangeBounds};
73 use std::path::{Path, PathBuf};
74 use std::process::{Command, Output};
75 use std::str;
76
77 #[derive(Clone, Debug)]
78 pub struct Config {
79 statik: Option<bool>,
80 min_version: Bound<String>,
81 max_version: Bound<String>,
82 extra_args: Vec<OsString>,
83 cargo_metadata: bool,
84 env_metadata: bool,
85 print_system_libs: bool,
86 print_system_cflags: bool,
87 }
88
89 #[derive(Clone, Debug)]
90 pub struct Library {
91 pub libs: Vec<String>,
92 pub link_paths: Vec<PathBuf>,
93 pub frameworks: Vec<String>,
94 pub framework_paths: Vec<PathBuf>,
95 pub include_paths: Vec<PathBuf>,
96 pub defines: HashMap<String, Option<String>>,
97 pub version: String,
98 _priv: (),
99 }
100
101 /// Represents all reasons `pkg-config` might not succeed or be run at all.
102 #[derive(Debug)]
103 pub enum Error {
104 /// Aborted because of `*_NO_PKG_CONFIG` environment variable.
105 ///
106 /// Contains the name of the responsible environment variable.
107 EnvNoPkgConfig(String),
108
109 /// Cross compilation detected.
110 ///
111 /// Override with `PKG_CONFIG_ALLOW_CROSS=1`.
112 CrossCompilation,
113
114 /// Failed to run `pkg-config`.
115 ///
116 /// Contains the command and the cause.
117 Command { command: String, cause: io::Error },
118
119 /// `pkg-config` did not exit sucessfully.
120 ///
121 /// Contains the command and output.
122 Failure { command: String, output: Output },
123
124 #[doc(hidden)]
125 // please don't match on this, we're likely to add more variants over time
126 __Nonexhaustive,
127 }
128
129 impl error::Error for Error {
description(&self) -> &str130 fn description(&self) -> &str {
131 match *self {
132 Error::EnvNoPkgConfig(_) => "pkg-config requested to be aborted",
133 Error::CrossCompilation => {
134 "pkg-config doesn't handle cross compilation. \
135 Use PKG_CONFIG_ALLOW_CROSS=1 to override"
136 }
137 Error::Command { .. } => "failed to run pkg-config",
138 Error::Failure { .. } => "pkg-config did not exit sucessfully",
139 Error::__Nonexhaustive => panic!(),
140 }
141 }
142
cause(&self) -> Option<&dyn error::Error>143 fn cause(&self) -> Option<&dyn error::Error> {
144 match *self {
145 Error::Command { ref cause, .. } => Some(cause),
146 _ => None,
147 }
148 }
149 }
150
151 impl fmt::Display for Error {
fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>152 fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
153 match *self {
154 Error::EnvNoPkgConfig(ref name) => write!(f, "Aborted because {} is set", name),
155 Error::CrossCompilation => write!(
156 f,
157 "Cross compilation detected. \
158 Use PKG_CONFIG_ALLOW_CROSS=1 to override"
159 ),
160 Error::Command {
161 ref command,
162 ref cause,
163 } => write!(f, "Failed to run `{}`: {}", command, cause),
164 Error::Failure {
165 ref command,
166 ref output,
167 } => {
168 let stdout = str::from_utf8(&output.stdout).unwrap();
169 let stderr = str::from_utf8(&output.stderr).unwrap();
170 write!(
171 f,
172 "`{}` did not exit successfully: {}",
173 command, output.status
174 )?;
175 if !stdout.is_empty() {
176 write!(f, "\n--- stdout\n{}", stdout)?;
177 }
178 if !stderr.is_empty() {
179 write!(f, "\n--- stderr\n{}", stderr)?;
180 }
181 Ok(())
182 }
183 Error::__Nonexhaustive => panic!(),
184 }
185 }
186 }
187
188 /// Deprecated in favor of the probe_library function
189 #[doc(hidden)]
find_library(name: &str) -> Result<Library, String>190 pub fn find_library(name: &str) -> Result<Library, String> {
191 probe_library(name).map_err(|e| e.to_string())
192 }
193
194 /// Simple shortcut for using all default options for finding a library.
probe_library(name: &str) -> Result<Library, Error>195 pub fn probe_library(name: &str) -> Result<Library, Error> {
196 Config::new().probe(name)
197 }
198
199 /// Run `pkg-config` to get the value of a variable from a package using
200 /// --variable.
get_variable(package: &str, variable: &str) -> Result<String, Error>201 pub fn get_variable(package: &str, variable: &str) -> Result<String, Error> {
202 let arg = format!("--variable={}", variable);
203 let cfg = Config::new();
204 let out = run(cfg.command(package, &[&arg]))?;
205 Ok(str::from_utf8(&out).unwrap().trim_end().to_owned())
206 }
207
208 impl Config {
209 /// Creates a new set of configuration options which are all initially set
210 /// to "blank".
new() -> Config211 pub fn new() -> Config {
212 Config {
213 statik: None,
214 min_version: Bound::Unbounded,
215 max_version: Bound::Unbounded,
216 extra_args: vec![],
217 print_system_cflags: true,
218 print_system_libs: true,
219 cargo_metadata: true,
220 env_metadata: false,
221 }
222 }
223
224 /// Indicate whether the `--static` flag should be passed.
225 ///
226 /// This will override the inference from environment variables described in
227 /// the crate documentation.
statik(&mut self, statik: bool) -> &mut Config228 pub fn statik(&mut self, statik: bool) -> &mut Config {
229 self.statik = Some(statik);
230 self
231 }
232
233 /// Indicate that the library must be at least version `vers`.
atleast_version(&mut self, vers: &str) -> &mut Config234 pub fn atleast_version(&mut self, vers: &str) -> &mut Config {
235 self.min_version = Bound::Included(vers.to_string());
236 self.max_version = Bound::Unbounded;
237 self
238 }
239
240 /// Indicate that the library must be equal to version `vers`.
exactly_version(&mut self, vers: &str) -> &mut Config241 pub fn exactly_version(&mut self, vers: &str) -> &mut Config {
242 self.min_version = Bound::Included(vers.to_string());
243 self.max_version = Bound::Included(vers.to_string());
244 self
245 }
246
247 /// Indicate that the library's version must be in `range`.
range_version<'a, R>(&mut self, range: R) -> &mut Config where R: RangeBounds<&'a str>,248 pub fn range_version<'a, R>(&mut self, range: R) -> &mut Config
249 where
250 R: RangeBounds<&'a str>,
251 {
252 self.min_version = match range.start_bound() {
253 Bound::Included(vers) => Bound::Included(vers.to_string()),
254 Bound::Excluded(vers) => Bound::Excluded(vers.to_string()),
255 Bound::Unbounded => Bound::Unbounded,
256 };
257 self.max_version = match range.end_bound() {
258 Bound::Included(vers) => Bound::Included(vers.to_string()),
259 Bound::Excluded(vers) => Bound::Excluded(vers.to_string()),
260 Bound::Unbounded => Bound::Unbounded,
261 };
262 self
263 }
264
265 /// Add an argument to pass to pkg-config.
266 ///
267 /// It's placed after all of the arguments generated by this library.
arg<S: AsRef<OsStr>>(&mut self, arg: S) -> &mut Config268 pub fn arg<S: AsRef<OsStr>>(&mut self, arg: S) -> &mut Config {
269 self.extra_args.push(arg.as_ref().to_os_string());
270 self
271 }
272
273 /// Define whether metadata should be emitted for cargo allowing it to
274 /// automatically link the binary. Defaults to `true`.
cargo_metadata(&mut self, cargo_metadata: bool) -> &mut Config275 pub fn cargo_metadata(&mut self, cargo_metadata: bool) -> &mut Config {
276 self.cargo_metadata = cargo_metadata;
277 self
278 }
279
280 /// Define whether metadata should be emitted for cargo allowing to
281 /// automatically rebuild when environment variables change. Defaults to
282 /// `false`.
env_metadata(&mut self, env_metadata: bool) -> &mut Config283 pub fn env_metadata(&mut self, env_metadata: bool) -> &mut Config {
284 self.env_metadata = env_metadata;
285 self
286 }
287
288 /// Enable or disable the `PKG_CONFIG_ALLOW_SYSTEM_LIBS` environment
289 /// variable.
290 ///
291 /// This env var is enabled by default.
print_system_libs(&mut self, print: bool) -> &mut Config292 pub fn print_system_libs(&mut self, print: bool) -> &mut Config {
293 self.print_system_libs = print;
294 self
295 }
296
297 /// Enable or disable the `PKG_CONFIG_ALLOW_SYSTEM_CFLAGS` environment
298 /// variable.
299 ///
300 /// This env var is enabled by default.
print_system_cflags(&mut self, print: bool) -> &mut Config301 pub fn print_system_cflags(&mut self, print: bool) -> &mut Config {
302 self.print_system_cflags = print;
303 self
304 }
305
306 /// Deprecated in favor fo the `probe` function
307 #[doc(hidden)]
find(&self, name: &str) -> Result<Library, String>308 pub fn find(&self, name: &str) -> Result<Library, String> {
309 self.probe(name).map_err(|e| e.to_string())
310 }
311
312 /// Run `pkg-config` to find the library `name`.
313 ///
314 /// This will use all configuration previously set to specify how
315 /// `pkg-config` is run.
probe(&self, name: &str) -> Result<Library, Error>316 pub fn probe(&self, name: &str) -> Result<Library, Error> {
317 let abort_var_name = format!("{}_NO_PKG_CONFIG", envify(name));
318 if self.env_var_os(&abort_var_name).is_some() {
319 return Err(Error::EnvNoPkgConfig(abort_var_name));
320 } else if !self.target_supported() {
321 return Err(Error::CrossCompilation);
322 }
323
324 let mut library = Library::new();
325
326 let output = run(self.command(name, &["--libs", "--cflags"]))?;
327 library.parse_libs_cflags(name, &output, self);
328
329 let output = run(self.command(name, &["--modversion"]))?;
330 library.parse_modversion(str::from_utf8(&output).unwrap());
331
332 Ok(library)
333 }
334
target_supported(&self) -> bool335 pub fn target_supported(&self) -> bool {
336 let target = env::var("TARGET").unwrap_or_default();
337 let host = env::var("HOST").unwrap_or_default();
338
339 // Only use pkg-config in host == target situations by default (allowing an
340 // override).
341 if host == target {
342 return true;
343 }
344
345 // pkg-config may not be aware of cross-compilation, and require
346 // a wrapper script that sets up platform-specific prefixes.
347 match self.targetted_env_var("PKG_CONFIG_ALLOW_CROSS") {
348 // don't use pkg-config if explicitly disabled
349 Ok(ref val) if val == "0" => false,
350 Ok(_) => true,
351 Err(_) => {
352 // if not disabled, and pkg-config is customized,
353 // then assume it's prepared for cross-compilation
354 self.targetted_env_var("PKG_CONFIG").is_ok()
355 || self.targetted_env_var("PKG_CONFIG_SYSROOT_DIR").is_ok()
356 }
357 }
358 }
359
360 /// Deprecated in favor of the top level `get_variable` function
361 #[doc(hidden)]
get_variable(package: &str, variable: &str) -> Result<String, String>362 pub fn get_variable(package: &str, variable: &str) -> Result<String, String> {
363 get_variable(package, variable).map_err(|e| e.to_string())
364 }
365
targetted_env_var(&self, var_base: &str) -> Result<String, env::VarError>366 fn targetted_env_var(&self, var_base: &str) -> Result<String, env::VarError> {
367 if let Ok(target) = env::var("TARGET") {
368 let host = env::var("HOST")?;
369 let kind = if host == target { "HOST" } else { "TARGET" };
370 let target_u = target.replace("-", "_");
371
372 self.env_var(&format!("{}_{}", var_base, target))
373 .or_else(|_| self.env_var(&format!("{}_{}", var_base, target_u)))
374 .or_else(|_| self.env_var(&format!("{}_{}", kind, var_base)))
375 .or_else(|_| self.env_var(var_base))
376 } else {
377 self.env_var(var_base)
378 }
379 }
380
env_var(&self, name: &str) -> Result<String, env::VarError>381 fn env_var(&self, name: &str) -> Result<String, env::VarError> {
382 if self.env_metadata {
383 println!("cargo:rerun-if-env-changed={}", name);
384 }
385 env::var(name)
386 }
387
env_var_os(&self, name: &str) -> Option<OsString>388 fn env_var_os(&self, name: &str) -> Option<OsString> {
389 if self.env_metadata {
390 println!("cargo:rerun-if-env-changed={}", name);
391 }
392 env::var_os(name)
393 }
394
is_static(&self, name: &str) -> bool395 fn is_static(&self, name: &str) -> bool {
396 self.statik.unwrap_or_else(|| self.infer_static(name))
397 }
398
command(&self, name: &str, args: &[&str]) -> Command399 fn command(&self, name: &str, args: &[&str]) -> Command {
400 let exe = self
401 .env_var("PKG_CONFIG")
402 .unwrap_or_else(|_| String::from("pkg-config"));
403 let mut cmd = Command::new(exe);
404 if self.is_static(name) {
405 cmd.arg("--static");
406 }
407 cmd.args(args).args(&self.extra_args);
408
409 if let Ok(value) = self.targetted_env_var("PKG_CONFIG_PATH") {
410 cmd.env("PKG_CONFIG_PATH", value);
411 }
412 if let Ok(value) = self.targetted_env_var("PKG_CONFIG_LIBDIR") {
413 cmd.env("PKG_CONFIG_LIBDIR", value);
414 }
415 if let Ok(value) = self.targetted_env_var("PKG_CONFIG_SYSROOT_DIR") {
416 cmd.env("PKG_CONFIG_SYSROOT_DIR", value);
417 }
418 if self.print_system_libs {
419 cmd.env("PKG_CONFIG_ALLOW_SYSTEM_LIBS", "1");
420 }
421 if self.print_system_cflags {
422 cmd.env("PKG_CONFIG_ALLOW_SYSTEM_CFLAGS", "1");
423 }
424 cmd.arg(name);
425 match self.min_version {
426 Bound::Included(ref version) => {
427 cmd.arg(&format!("{} >= {}", name, version));
428 }
429 Bound::Excluded(ref version) => {
430 cmd.arg(&format!("{} > {}", name, version));
431 }
432 _ => (),
433 }
434 match self.max_version {
435 Bound::Included(ref version) => {
436 cmd.arg(&format!("{} <= {}", name, version));
437 }
438 Bound::Excluded(ref version) => {
439 cmd.arg(&format!("{} < {}", name, version));
440 }
441 _ => (),
442 }
443 cmd
444 }
445
print_metadata(&self, s: &str)446 fn print_metadata(&self, s: &str) {
447 if self.cargo_metadata {
448 println!("cargo:{}", s);
449 }
450 }
451
infer_static(&self, name: &str) -> bool452 fn infer_static(&self, name: &str) -> bool {
453 let name = envify(name);
454 if self.env_var_os(&format!("{}_STATIC", name)).is_some() {
455 true
456 } else if self.env_var_os(&format!("{}_DYNAMIC", name)).is_some() {
457 false
458 } else if self.env_var_os("PKG_CONFIG_ALL_STATIC").is_some() {
459 true
460 } else if self.env_var_os("PKG_CONFIG_ALL_DYNAMIC").is_some() {
461 false
462 } else {
463 false
464 }
465 }
466 }
467
468 // Implement Default manualy since Bound does not implement Default.
469 impl Default for Config {
default() -> Config470 fn default() -> Config {
471 Config {
472 statik: None,
473 min_version: Bound::Unbounded,
474 max_version: Bound::Unbounded,
475 extra_args: vec![],
476 print_system_cflags: false,
477 print_system_libs: false,
478 cargo_metadata: false,
479 env_metadata: false,
480 }
481 }
482 }
483
484 impl Library {
new() -> Library485 fn new() -> Library {
486 Library {
487 libs: Vec::new(),
488 link_paths: Vec::new(),
489 include_paths: Vec::new(),
490 frameworks: Vec::new(),
491 framework_paths: Vec::new(),
492 defines: HashMap::new(),
493 version: String::new(),
494 _priv: (),
495 }
496 }
497
parse_libs_cflags(&mut self, name: &str, output: &[u8], config: &Config)498 fn parse_libs_cflags(&mut self, name: &str, output: &[u8], config: &Config) {
499 let mut is_msvc = false;
500 if let Ok(target) = env::var("TARGET") {
501 if target.contains("msvc") {
502 is_msvc = true;
503 }
504 }
505
506 let words = split_flags(output);
507 let parts = words
508 .iter()
509 .filter(|l| l.len() > 2)
510 .map(|arg| (&arg[0..2], &arg[2..]))
511 .collect::<Vec<_>>();
512
513 let mut dirs = Vec::new();
514 let statik = config.is_static(name);
515 for &(flag, val) in &parts {
516 match flag {
517 "-L" => {
518 let meta = format!("rustc-link-search=native={}", val);
519 config.print_metadata(&meta);
520 dirs.push(PathBuf::from(val));
521 self.link_paths.push(PathBuf::from(val));
522 }
523 "-F" => {
524 let meta = format!("rustc-link-search=framework={}", val);
525 config.print_metadata(&meta);
526 self.framework_paths.push(PathBuf::from(val));
527 }
528 "-I" => {
529 self.include_paths.push(PathBuf::from(val));
530 }
531 "-l" => {
532 // These are provided by the CRT with MSVC
533 if is_msvc && ["m", "c", "pthread"].contains(&val) {
534 continue;
535 }
536
537 if statik && is_static_available(val, &dirs) {
538 let meta = format!("rustc-link-lib=static={}", val);
539 config.print_metadata(&meta);
540 } else {
541 let meta = format!("rustc-link-lib={}", val);
542 config.print_metadata(&meta);
543 }
544
545 self.libs.push(val.to_string());
546 }
547 "-D" => {
548 let mut iter = val.split('=');
549 self.defines.insert(
550 iter.next().unwrap().to_owned(),
551 iter.next().map(|s| s.to_owned()),
552 );
553 }
554 _ => {}
555 }
556 }
557
558 let mut iter = words.iter().flat_map(|arg| {
559 if arg.starts_with("-Wl,") {
560 arg[4..].split(',').collect()
561 } else {
562 vec![arg.as_ref()]
563 }
564 });
565 while let Some(part) = iter.next() {
566 if part != "-framework" {
567 continue;
568 }
569 if let Some(lib) = iter.next() {
570 let meta = format!("rustc-link-lib=framework={}", lib);
571 config.print_metadata(&meta);
572 self.frameworks.push(lib.to_string());
573 }
574 }
575 }
576
parse_modversion(&mut self, output: &str)577 fn parse_modversion(&mut self, output: &str) {
578 self.version.push_str(output.lines().nth(0).unwrap().trim());
579 }
580 }
581
envify(name: &str) -> String582 fn envify(name: &str) -> String {
583 name.chars()
584 .map(|c| c.to_ascii_uppercase())
585 .map(|c| if c == '-' { '_' } else { c })
586 .collect()
587 }
588
589 /// System libraries should only be linked dynamically
is_static_available(name: &str, dirs: &[PathBuf]) -> bool590 fn is_static_available(name: &str, dirs: &[PathBuf]) -> bool {
591 let libname = format!("lib{}.a", name);
592 let system_roots = if cfg!(target_os = "macos") {
593 vec![Path::new("/Library"), Path::new("/System")]
594 } else {
595 vec![Path::new("/usr")]
596 };
597
598 dirs.iter().any(|dir| {
599 !system_roots.iter().any(|sys| dir.starts_with(sys)) && dir.join(&libname).exists()
600 })
601 }
602
run(mut cmd: Command) -> Result<Vec<u8>, Error>603 fn run(mut cmd: Command) -> Result<Vec<u8>, Error> {
604 match cmd.output() {
605 Ok(output) => {
606 if output.status.success() {
607 Ok(output.stdout)
608 } else {
609 Err(Error::Failure {
610 command: format!("{:?}", cmd),
611 output,
612 })
613 }
614 }
615 Err(cause) => Err(Error::Command {
616 command: format!("{:?}", cmd),
617 cause,
618 }),
619 }
620 }
621
622 /// Split output produced by pkg-config --cflags and / or --libs into separate flags.
623 ///
624 /// Backslash in output is used to preserve literal meaning of following byte. Different words are
625 /// separated by unescaped space. Other whitespace characters generally should not occur unescaped
626 /// at all, apart from the newline at the end of output. For compatibility with what others
627 /// consumers of pkg-config output would do in this scenario, they are used here for splitting as
628 /// well.
split_flags(output: &[u8]) -> Vec<String>629 fn split_flags(output: &[u8]) -> Vec<String> {
630 let mut word = Vec::new();
631 let mut words = Vec::new();
632 let mut escaped = false;
633
634 for &b in output {
635 match b {
636 _ if escaped => {
637 escaped = false;
638 word.push(b);
639 }
640 b'\\' => escaped = true,
641 b'\t' | b'\n' | b'\r' | b' ' => {
642 if !word.is_empty() {
643 words.push(String::from_utf8(word).unwrap());
644 word = Vec::new();
645 }
646 }
647 _ => word.push(b),
648 }
649 }
650
651 if !word.is_empty() {
652 words.push(String::from_utf8(word).unwrap());
653 }
654
655 words
656 }
657
658 #[test]
659 #[cfg(target_os = "macos")]
system_library_mac_test()660 fn system_library_mac_test() {
661 assert!(!is_static_available(
662 "PluginManager",
663 &[PathBuf::from("/Library/Frameworks")]
664 ));
665 assert!(!is_static_available(
666 "python2.7",
667 &[PathBuf::from(
668 "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config"
669 )]
670 ));
671 assert!(!is_static_available(
672 "ffi_convenience",
673 &[PathBuf::from(
674 "/Library/Ruby/Gems/2.0.0/gems/ffi-1.9.10/ext/ffi_c/libffi-x86_64/.libs"
675 )]
676 ));
677
678 // Homebrew is in /usr/local, and it's not a part of the OS
679 if Path::new("/usr/local/lib/libpng16.a").exists() {
680 assert!(is_static_available(
681 "png16",
682 &[PathBuf::from("/usr/local/lib")]
683 ));
684
685 let libpng = Config::new()
686 .range_version("1".."99")
687 .probe("libpng16")
688 .unwrap();
689 assert!(libpng.version.find('\n').is_none());
690 }
691 }
692
693 #[test]
694 #[cfg(target_os = "linux")]
system_library_linux_test()695 fn system_library_linux_test() {
696 assert!(!is_static_available(
697 "util",
698 &[PathBuf::from("/usr/lib/x86_64-linux-gnu")]
699 ));
700 assert!(!is_static_available("dialog", &[PathBuf::from("/usr/lib")]));
701 }
702