mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 06:42:23 +00:00
168 lines
5.5 KiB
Rust
168 lines
5.5 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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// 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().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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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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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 libstd is backward compatible with FreeBSD 10.
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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 || rustc_dep_of_std => {
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println!("cargo:rustc-cfg=freebsd10")
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}
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Some(11) if libc_ci => println!("cargo:rustc-cfg=freebsd11"),
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Some(12) if libc_ci => println!("cargo:rustc-cfg=freebsd12"),
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Some(13) if libc_ci => println!("cargo:rustc-cfg=freebsd13"),
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Some(14) if libc_ci => println!("cargo:rustc-cfg=freebsd14"),
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Some(_) | None => println!("cargo:rustc-cfg=freebsd11"),
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}
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// On CI: deny all warnings
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if libc_ci {
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println!("cargo:rustc-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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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 >= 1.26 supports i128 and u128:
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if rustc_minor_ver >= 26 || rustc_dep_of_std {
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println!("cargo:rustc-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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println!("cargo:rustc-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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println!("cargo:rustc-cfg=libc_packedN");
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println!("cargo:rustc-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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println!("cargo:rustc-cfg=libc_non_exhaustive");
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}
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if rustc_minor_ver >= 51 || rustc_dep_of_std {
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println!("cargo:rustc-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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println!("cargo:rustc-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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println!("cargo:rustc-cfg=libc_thread_local");
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}
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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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println!("cargo:rustc-cfg=libc_const_extern_fn");
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}
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}
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fn rustc_minor_nightly() -> Option<(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 => 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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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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Some((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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_ => None,
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}
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}
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