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use std::env;
use std::path::Path;
fn main() {
// Only rerun if this file changes; the script doesn't depend on our code
println!("cargo:rerun-if-changed=build.rs");
let mut apple = env::var_os("CARGO_FEATURE_APPLE").is_some();
let mut compiler_rt = env::var_os("CARGO_FEATURE_COMPILER_RT").is_some();
let gnustep = env::var_os("CARGO_FEATURE_GNUSTEP_1_7").is_some();
let objfw = env::var_os("CARGO_FEATURE_OBJFW").is_some();
if let (false, false, false, false) = (apple, compiler_rt, gnustep, objfw) {
let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
if let "macos" | "ios" | "tvos" | "watchos" = &*target_os {
apple = true;
// Add cheaty #[cfg(feature = "apple")] directive
println!("cargo:rustc-cfg=feature=\"apple\"");
} else {
compiler_rt = true;
// Add cheaty #[cfg(feature = "compiler-rt")] directive
println!("cargo:rustc-cfg=feature=\"compiler-rt\"");
}
}
let mut cc_args = "-fblocks".to_owned();
match (apple, compiler_rt, gnustep, objfw) {
(true, false, false, false) => {
// Link to libclosure (internally called libsystem_blocks), which is
// exported by libSystem.dylib.
//
// Note that System.framework is just a deprecated wrapper over the
// dynamic library.
println!("cargo:rustc-link-lib=dylib=System");
// Alternative: Only link to libsystem_blocks.dylib
// println!("cargo:rustc-link-search=native=/usr/lib/system");
// println!("cargo:rustc-link-lib=dylib=system_blocks");
}
(false, true, false, false) => {
println!("cargo:rustc-link-lib=dylib=BlocksRuntime");
}
(false, false, true, false) => {
// Don't link to anything; objc-sys already does that for us!
// Add GNUStep compability headers to make `#include <Block.h>`
// work (on newer GNUStep versions these headers are present)
if env::var_os("CARGO_FEATURE_GNUSTEP_2_0").is_none() {
let compat_headers =
Path::new(env!("CARGO_MANIFEST_DIR")).join("gnustep-compat-headers");
cc_args.push_str(" -I");
cc_args.push_str(compat_headers.to_str().unwrap());
}
}
(false, false, false, true) => unimplemented!(),
// Checked in if-let above
(false, false, false, false) => unreachable!(),
(_, _, _, _) => panic!("Invalid feature combination; only one runtime may be selected!"),
}
// Add DEP_BLOCK_CC_ARGS
println!("cargo:cc_args={}", cc_args);
}