6 // List of cfgs this build script is allowed to set. The list is needed to support check-cfg, as we
35 // Extra values to allow for check-cfg.
46     // Avoid unnecessary re-building.  in main()
47     println!("cargo:rerun-if-changed=build.rs");  in main()
66     // On CI, we detect the actual FreeBSD version and match its ABI exactly,  in main()
80         // Non-Emscripten or version < 3.1.42.  in main()
89     // Rust >= 1.15 supports private module use:  in main()
94     // Rust >= 1.19 supports unions:  in main()
99     // Rust >= 1.24 supports const mem::size_of:  in main()
104     // Rust >= 1.25 supports repr(align):  in main()
109     // Rust >= 1.26 supports i128 and u128:  in main()
114     // Rust >= 1.30 supports `core::ffi::c_void`, so libc can just re-export it.  in main()
116     // backwards-compatibility.  in main()
121     // Rust >= 1.33 supports repr(packed(N)) and cfg(target_vendor).  in main()
127     // Rust >= 1.40 supports #[non_exhaustive].  in main()
132     // Rust >= 1.47 supports long array:  in main()
141     // Rust >= 1.37.0 allows underscores as anonymous constant names.  in main()
151     // Rust >= 1.62.0 allows to use `const_extern_fn` for "Rust" and "C".  in main()
155         // Rust < 1.62.0 requires a crate feature and feature gate.  in main()
158                 panic!("const-extern-fn requires a nightly compiler >= 1.40");  in main()
165     // check-cfg is a nightly cargo/rustc feature to warn when unknown cfgs are used across the  in main()
167     // rust-lang/rust enforces it, this is useful when using a custom libc fork there.  in main()
169     // https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg  in main()
173                 println!("cargo:rustc-check-cfg=cfg({})", cfg);  in main()
175                 println!("cargo:rustc-check-cfg=values({})", cfg);  in main()
181                 println!("cargo:rustc-check-cfg=cfg({},values(\"{}\"))", name, values);  in main()
183                 println!("cargo:rustc-check-cfg=values({},\"{}\")", name, values);  in main()
189 fn rustc_minor_nightly() -> (u32, bool) {  in rustc_minor_nightly()
194                 None => panic!("Failed to get rustc version"),  in rustc_minor_nightly()
201         .arg("--version")  in rustc_minor_nightly()
204         .expect("Failed to get rustc version");  in rustc_minor_nightly()
212     let version = otry!(str::from_utf8(&output.stdout).ok());  in rustc_minor_nightly()  localVariable
213     let mut pieces = version.split('.');  in rustc_minor_nightly()
216         panic!("Failed to get rustc version");  in rustc_minor_nightly()
221     // If `rustc` was built from a tarball, its version string  in rustc_minor_nightly()
223     // (e.g. "rustc 1.39.0"). Treat this case as non-nightly,  in rustc_minor_nightly()
226     let nightly_raw = otry!(pieces.next()).split('-').nth(1);  in rustc_minor_nightly()
235 fn which_freebsd() -> Option<i32> {  in which_freebsd()
236     let output = std::process::Command::new("freebsd-version").output().ok();  in which_freebsd()
262 fn emcc_version_code() -> Option<u64> {  in emcc_version_code()
264         .arg("-dumpversion")  in emcc_version_code()
279     let version = stdout.unwrap();  in emcc_version_code()  localVariable
281     // Some Emscripten versions come with `-git` attached, so split the  in emcc_version_code()
282     // version string also on the `-` char.  in emcc_version_code()
283     let mut pieces = version.trim().split(|c| c == '.' || c == '-');  in emcc_version_code()
296     println!("cargo:rustc-cfg={}", cfg);  in set_cfg()