75 lines
3.2 KiB
Rust
75 lines
3.2 KiB
Rust
use std::env;
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use std::path::Path;
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fn main() {
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// Only rerun if this file changes; the script doesn't depend on our code
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println!("cargo:rerun-if-changed=build.rs");
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let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
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let mut apple = env::var_os("CARGO_FEATURE_APPLE").is_some();
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let compiler_rt = env::var_os("CARGO_FEATURE_COMPILER_RT").is_some();
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let mut gnustep = env::var_os("CARGO_FEATURE_GNUSTEP_1_7").is_some();
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let objfw = env::var_os("CARGO_FEATURE_UNSTABLE_OBJFW").is_some();
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// Only when the crate is being compiled directly
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if cfg!(feature = "unstable-docsrs") {
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if let "macos" | "ios" | "tvos" | "watchos" = &*target_os {
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apple = true;
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// Add cheaty #[cfg(feature = "apple")] directive
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println!("cargo:rustc-cfg=feature=\"apple\"");
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} else {
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// Also winobjc
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gnustep = true;
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// Add cheaty #[cfg(feature = "gnustep-1-7")] directive
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println!("cargo:rustc-cfg=feature=\"gnustep-1-7\"");
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}
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}
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let mut cc_args = "-fblocks".to_owned();
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match (apple, compiler_rt, gnustep, objfw) {
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(true, false, false, false) => {
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// Link to libclosure (internally called libsystem_blocks), which is
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// exported by libSystem.dylib.
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//
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// Note that System.framework is just a deprecated wrapper over the
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// dynamic library.
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println!("cargo:rustc-link-lib=dylib=System");
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// Alternative: Only link to libsystem_blocks.dylib
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// println!("cargo:rustc-link-search=native=/usr/lib/system");
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// println!("cargo:rustc-link-lib=dylib=system_blocks");
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}
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(false, true, false, false) => {
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println!("cargo:rustc-link-lib=dylib=BlocksRuntime");
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}
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(false, false, true, false) => {
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// Don't link to anything; objc-sys already does that for us!
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// Add GNUStep compability headers to make `#include <Block.h>`
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// work (on newer GNUStep versions these headers are present)
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if env::var_os("CARGO_FEATURE_GNUSTEP_2_0").is_none() {
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let compat_headers =
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Path::new(env!("CARGO_MANIFEST_DIR")).join("compat-headers/gnustep");
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cc_args.push_str(" -I");
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cc_args.push_str(compat_headers.to_str().unwrap());
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}
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}
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(false, false, false, true) => {
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// Add compability headers to make `#include <Block.h>` work.
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let compat_headers = Path::new(env!("CARGO_MANIFEST_DIR")).join("compat-headers/objfw");
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cc_args.push_str(" -I");
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cc_args.push_str(compat_headers.to_str().unwrap());
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println!("cargo:rustc-link-lib=dylib=objfw");
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unimplemented!("ObjFW is not yet supported")
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}
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// Checked in if-let above
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(false, false, false, false) => {
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panic!("Invalid feature combination; at least one runtime must be selected!")
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}
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(_, _, _, _) => panic!("Invalid feature combination; only one runtime may be selected!"),
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}
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// Add DEP_BLOCK_[version]_CC_ARGS
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println!("cargo:cc_args={}", cc_args);
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}
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