extern crate pkg_config;
extern crate cc;
extern crate dunce;
use std::env;
use std::process;
use std::path::PathBuf;
fn main() {
let wants_static = cfg!(feature = "static") || env::var("PNG_STATIC").is_ok();
if !try_libpng_config(wants_static) && !try_pkgconfig(wants_static) {
build_static();
}
}
fn try_libpng_config(wants_static: bool) -> bool {
if let Some(ver) = libpng_config(wants_static, "--version") {
if ver.trim_left().starts_with("1.2") {
return false;
}
} else {
return false;
}
if let Some(libdir) = libpng_config(wants_static, "--libdir") {
let libdir = libdir.trim_right();
println!("cargo:rustc-link-search=native={}", libdir.trim_right());
println!("cargo:root={}", libdir);
} else {
return false;
}
if let Some(iopts) = libpng_config(wants_static, "--I_opts") {
let dirs: Vec<_> = iopts.split(" -I").map(|opt| if opt.starts_with("-I") {&opt[2..]} else {opt}).collect();
println!("cargo:include={}", env::join_paths(dirs).unwrap().to_string_lossy());
}
if let Some(libs) = libpng_config(wants_static, "--libs") {
for lib in libs.trim_right().split_whitespace() {
if lib.starts_with("-l") {
let lib_name = &lib[2..];
let link_static = if lib_name.contains("png") {wants_static} else {
let lib_name = lib_name.to_uppercase();
env::var_os(format!("{}_STATIC", lib_name)).is_some() ||
env::var_os(format!("LIB{}_STATIC", lib_name)).is_some()
};
println!("cargo:rustc-link-lib={}{}", if link_static {"static="} else {""}, lib_name);
}
}
} else {
return false;
}
true
}
fn libpng_config(wants_static: bool, arg: &str) -> Option<String> {
let mut cmd = process::Command::new("libpng-config");
if wants_static {
cmd.arg("--static");
}
cmd.arg(arg);
if let Ok(out) = cmd.output() {
String::from_utf8(out.stdout).ok()
} else {
None
}
}
fn try_pkgconfig(wants_static: bool) -> bool {
let mut pkg = pkg_config::Config::new();
pkg.statik(wants_static);
pkg.atleast_version("1.4"); if let Ok(lib) = pkg.probe("libpng") {
if let Some(path) = lib.include_paths.get(0) {
println!("cargo:include={}", path.display());
}
if let Some(path) = lib.link_paths.get(0) {
println!("cargo:root={}", path.display());
}
return true;
}
false
}
fn build_static() {
let mut cc = cc::Build::new();
cc.warnings(false);
let vendor = dunce::canonicalize("vendor").unwrap();
let mut includes = vec![vendor];
if let Some(inc) = env::var_os("DEP_Z_INCLUDE") {
includes.push(PathBuf::from(inc));
if let Ok(lib) = env::var("DEP_Z_ROOT") {
println!("cargo:rustc-link-search=native={}", lib);
println!("cargo:rustc-link-lib=static=zlib");
} else {
println!("cargo:rustc-link-lib=zlib");
}
} else if let Ok(libz) = pkg_config::probe_library("z") {
for path in libz.include_paths {
includes.push(PathBuf::from(path));
}
} else {
println!("cargo:rustc-link-lib=z");
}
println!("cargo:include={}", env::join_paths(&includes).unwrap().to_string_lossy());
println!("cargo:root={}", env::var("OUT_DIR").unwrap());
for path in includes {
cc.include(path);
}
cc
.file("vendor/png.c")
.file("vendor/pngerror.c")
.file("vendor/pngget.c")
.file("vendor/pngmem.c")
.file("vendor/pngpread.c")
.file("vendor/pngread.c")
.file("vendor/pngrio.c")
.file("vendor/pngrtran.c")
.file("vendor/pngrutil.c")
.file("vendor/pngset.c")
.file("vendor/pngtrans.c")
.file("vendor/pngwio.c")
.file("vendor/pngwrite.c")
.file("vendor/pngwtran.c")
.file("vendor/pngwutil.c")
.compile("libpng.a");
}