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