298 lines
9.3 KiB
Rust
298 lines
9.3 KiB
Rust
use std::env;
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use std::process::Command;
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use std::str;
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use std::string::String;
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// List of cfgs this build script is allowed to set. The list is needed to support check-cfg, as we
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// need to know all the possible cfgs that this script will set. If you need to set another cfg
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// make sure to add it to this list as well.
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const ALLOWED_CFGS: &'static [&'static str] = &[
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"emscripten_new_stat_abi",
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"freebsd10",
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"freebsd11",
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"freebsd12",
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"freebsd13",
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"freebsd14",
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"freebsd15",
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"libc_align",
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"libc_cfg_target_vendor",
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"libc_const_extern_fn",
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"libc_const_extern_fn_unstable",
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"libc_const_size_of",
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"libc_core_cvoid",
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"libc_deny_warnings",
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"libc_int128",
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"libc_long_array",
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"libc_non_exhaustive",
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"libc_packedN",
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"libc_priv_mod_use",
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"libc_ptr_addr_of",
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"libc_thread_local",
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"libc_underscore_const_names",
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"libc_union",
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];
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// Extra values to allow for check-cfg.
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const CHECK_CFG_EXTRA: &'static [(&'static str, &'static [&'static str])] = &[
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("target_os", &["switch", "aix", "ohos", "hurd"]),
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("target_env", &["illumos", "wasi", "aix", "ohos"]),
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(
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"target_arch",
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&["loongarch64", "mips32r6", "mips64r6", "csky"],
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),
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];
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fn main() {
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// Avoid unnecessary re-building.
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println!("cargo:rerun-if-changed=build.rs");
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let (rustc_minor_ver, is_nightly) = rustc_minor_nightly();
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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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let const_extern_fn_cargo_feature = env::var("CARGO_FEATURE_CONST_EXTERN_FN").is_ok();
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let libc_ci = env::var("LIBC_CI").is_ok();
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let libc_check_cfg = env::var("LIBC_CHECK_CFG").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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// The ABI of libc used by std is backward compatible with FreeBSD 12.
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// The ABI of libc from crates.io is backward compatible with FreeBSD 11.
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//
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// On CI, we detect the actual FreeBSD version and match its ABI exactly,
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// running tests to ensure that the ABI is correct.
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match which_freebsd() {
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Some(10) if libc_ci => set_cfg("freebsd10"),
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Some(11) if libc_ci => set_cfg("freebsd11"),
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Some(12) if libc_ci || rustc_dep_of_std => set_cfg("freebsd12"),
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Some(13) if libc_ci => set_cfg("freebsd13"),
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Some(14) if libc_ci => set_cfg("freebsd14"),
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Some(15) if libc_ci => set_cfg("freebsd15"),
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Some(_) | None => set_cfg("freebsd11"),
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}
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match emcc_version_code() {
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Some(v) if (v >= 30142) => set_cfg("emscripten_new_stat_abi"),
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// Non-Emscripten or version < 3.1.42.
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Some(_) | None => (),
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}
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// On CI: deny all warnings
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if libc_ci {
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set_cfg("libc_deny_warnings");
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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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set_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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set_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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set_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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set_cfg("libc_align");
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}
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// Rust >= 1.26 supports i128 and u128:
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if rustc_minor_ver >= 26 || rustc_dep_of_std {
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set_cfg("libc_int128");
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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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set_cfg("libc_core_cvoid");
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}
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// Rust >= 1.33 supports repr(packed(N)) and cfg(target_vendor).
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if rustc_minor_ver >= 33 || rustc_dep_of_std {
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set_cfg("libc_packedN");
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set_cfg("libc_cfg_target_vendor");
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}
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// Rust >= 1.40 supports #[non_exhaustive].
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if rustc_minor_ver >= 40 || rustc_dep_of_std {
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set_cfg("libc_non_exhaustive");
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}
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// Rust >= 1.47 supports long array:
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if rustc_minor_ver >= 47 || rustc_dep_of_std {
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set_cfg("libc_long_array");
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}
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if rustc_minor_ver >= 51 || rustc_dep_of_std {
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set_cfg("libc_ptr_addr_of");
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}
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// Rust >= 1.37.0 allows underscores as anonymous constant names.
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if rustc_minor_ver >= 37 || rustc_dep_of_std {
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set_cfg("libc_underscore_const_names");
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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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set_cfg("libc_thread_local");
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}
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// Rust >= 1.62.0 allows to use `const_extern_fn` for "Rust" and "C".
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if rustc_minor_ver >= 62 {
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set_cfg("libc_const_extern_fn");
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} else {
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// Rust < 1.62.0 requires a crate feature and feature gate.
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if const_extern_fn_cargo_feature {
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if !is_nightly || rustc_minor_ver < 40 {
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panic!("const-extern-fn requires a nightly compiler >= 1.40");
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}
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set_cfg("libc_const_extern_fn_unstable");
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set_cfg("libc_const_extern_fn");
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}
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}
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// check-cfg is a nightly cargo/rustc feature to warn when unknown cfgs are used across the
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// codebase. libc can configure it if the appropriate environment variable is passed. Since
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// rust-lang/rust enforces it, this is useful when using a custom libc fork there.
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//
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// https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg
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if libc_check_cfg {
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for cfg in ALLOWED_CFGS {
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if rustc_minor_ver >= 75 {
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println!("cargo:rustc-check-cfg=cfg({})", cfg);
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} else {
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println!("cargo:rustc-check-cfg=values({})", cfg);
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}
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}
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for &(name, values) in CHECK_CFG_EXTRA {
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let values = values.join("\",\"");
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if rustc_minor_ver >= 75 {
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println!("cargo:rustc-check-cfg=cfg({},values(\"{}\"))", name, values);
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} else {
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println!("cargo:rustc-check-cfg=values({},\"{}\")", name, values);
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}
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}
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}
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}
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fn rustc_minor_nightly() -> (u32, bool) {
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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 => panic!("Failed to get rustc version"),
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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 = Command::new(rustc)
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.arg("--version")
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.output()
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.ok()
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.expect("Failed to get rustc version");
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if !output.status.success() {
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panic!(
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"failed to run rustc: {}",
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String::from_utf8_lossy(output.stderr.as_slice())
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);
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}
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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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panic!("Failed to get rustc version");
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}
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let minor = pieces.next();
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// If `rustc` was built from a tarball, its version string
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// will have neither a git hash nor a commit date
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// (e.g. "rustc 1.39.0"). Treat this case as non-nightly,
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// since a nightly build should either come from CI
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// or a git checkout
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let nightly_raw = otry!(pieces.next()).split('-').nth(1);
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let nightly = nightly_raw
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.map(|raw| raw.starts_with("dev") || raw.starts_with("nightly"))
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.unwrap_or(false);
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let minor = otry!(otry!(minor).parse().ok());
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(minor, nightly)
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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("10") => Some(10),
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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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s if s.starts_with("13") => Some(13),
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s if s.starts_with("14") => Some(14),
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s if s.starts_with("15") => Some(15),
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_ => None,
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}
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}
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fn emcc_version_code() -> Option<u64> {
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let output = std::process::Command::new("emcc")
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.arg("-dumpversion")
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.output()
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.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 version = stdout.unwrap();
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// Some Emscripten versions come with `-git` attached, so split the
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// version string also on the `-` char.
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let mut pieces = version.trim().split(|c| c == '.' || c == '-');
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let major = pieces.next().and_then(|x| x.parse().ok()).unwrap_or(0);
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let minor = pieces.next().and_then(|x| x.parse().ok()).unwrap_or(0);
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let patch = pieces.next().and_then(|x| x.parse().ok()).unwrap_or(0);
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Some(major * 10000 + minor * 100 + patch)
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}
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fn set_cfg(cfg: &str) {
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if !ALLOWED_CFGS.contains(&cfg) {
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panic!("trying to set cfg {}, but it is not in ALLOWED_CFGS", cfg);
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}
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println!("cargo:rustc-cfg={}", cfg);
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}
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