106 lines
2.9 KiB
Rust
106 lines
2.9 KiB
Rust
use std::env;
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use std::process::Command;
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use std::str;
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fn main() {
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let rustc_minor_ver =
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rustc_minor_version().expect("Failed to get rustc version");
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let rustc_dep_of_std = env::var("CARGO_FEATURE_RUSTC_DEP_OF_STD").is_ok();
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let align_cargo_feature = env::var("CARGO_FEATURE_ALIGN").is_ok();
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if env::var("CARGO_FEATURE_USE_STD").is_ok() {
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println!(
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"cargo:warning=\"libc's use_std cargo feature is deprecated since libc 0.2.55; \
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please consider using the `std` cargo feature instead\""
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);
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}
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if env::var("LIBC_CI").is_ok() {
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if let Some(12) = which_freebsd() {
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println!("cargo:rustc-cfg=freebsd12");
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}
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}
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// Rust >= 1.15 supports private module use:
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if rustc_minor_ver >= 15 || rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_priv_mod_use");
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}
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// Rust >= 1.19 supports unions:
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if rustc_minor_ver >= 19 || rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_union");
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}
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// Rust >= 1.24 supports const mem::size_of:
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if rustc_minor_ver >= 24 || rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_const_size_of");
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}
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// Rust >= 1.25 supports repr(align):
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if rustc_minor_ver >= 25 || rustc_dep_of_std || align_cargo_feature {
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println!("cargo:rustc-cfg=libc_align");
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}
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// Rust >= 1.30 supports `core::ffi::c_void`, so libc can just re-export it.
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// Otherwise, it defines an incompatible type to retaining
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// backwards-compatibility.
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if rustc_minor_ver >= 30 || rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_core_cvoid");
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}
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// Rust >= 1.33 supports repr(packed(N))
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if rustc_minor_ver >= 33 || rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_packedN");
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}
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// #[thread_local] is currently unstable
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if rustc_dep_of_std {
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println!("cargo:rustc-cfg=libc_thread_local");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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macro_rules! otry {
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($e:expr) => {
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match $e {
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Some(e) => e,
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None => return None,
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}
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};
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}
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let rustc = otry!(env::var_os("RUSTC"));
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let output = otry!(Command::new(rustc).arg("--version").output().ok());
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let version = otry!(str::from_utf8(&output.stdout).ok());
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let mut pieces = version.split('.');
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if pieces.next() != Some("rustc 1") {
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return None;
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}
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otry!(pieces.next()).parse().ok()
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}
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fn which_freebsd() -> Option<i32> {
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let output = std::process::Command::new("freebsd-version").output().ok();
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if output.is_none() {
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return None;
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}
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let output = output.unwrap();
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if !output.status.success() {
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return None;
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}
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let stdout = String::from_utf8(output.stdout).ok();
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if stdout.is_none() {
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return None;
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}
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let stdout = stdout.unwrap();
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match &stdout {
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s if s.starts_with("11") => Some(11),
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s if s.starts_with("12") => Some(12),
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_ => None,
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}
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}
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