98 lines
3.3 KiB
Rust
98 lines
3.3 KiB
Rust
use std::env;
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use std::process::Command;
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use std::str::{self, FromStr};
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// The rustc-cfg strings below are *not* public API. Please let us know by
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// opening a GitHub issue if your build environment requires some way to enable
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// these cfgs other than by executing our build script.
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let minor = match rustc_minor_version() {
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Some(minor) => minor,
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None => return,
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};
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let target = env::var("TARGET").unwrap();
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let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
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// TryFrom, Atomic types, non-zero signed integers, and SystemTime::checked_add
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// stabilized in Rust 1.34:
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// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#tryfrom-and-tryinto
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// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#library-stabilizations
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if minor < 34 {
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println!("cargo:rustc-cfg=no_core_try_from");
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println!("cargo:rustc-cfg=no_num_nonzero_signed");
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println!("cargo:rustc-cfg=no_systemtime_checked_add");
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println!("cargo:rustc-cfg=no_relaxed_trait_bounds");
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}
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// Disabled on Emscripten targets before Rust 1.40 since
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// Emscripten did not support 128-bit integers until Rust 1.40
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// (https://github.com/rust-lang/rust/pull/65251)
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if emscripten && minor < 40 {
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println!("cargo:rustc-cfg=no_integer128");
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}
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// Current minimum supported version of serde_derive crate is Rust 1.56.
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if minor < 56 {
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println!("cargo:rustc-cfg=no_serde_derive");
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}
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// Support for #[cfg(target_has_atomic = "...")] stabilized in Rust 1.60.
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if minor < 60 {
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println!("cargo:rustc-cfg=no_target_has_atomic");
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// Allowlist of archs that support std::sync::atomic module. This is
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// based on rustc's compiler/rustc_target/src/spec/*.rs.
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let has_atomic64 = target.starts_with("x86_64")
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|| target.starts_with("i686")
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|| target.starts_with("aarch64")
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|| target.starts_with("powerpc64")
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|| target.starts_with("sparc64")
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|| target.starts_with("mips64el")
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|| target.starts_with("riscv64");
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let has_atomic32 = has_atomic64 || emscripten;
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if minor < 34 || !has_atomic64 {
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println!("cargo:rustc-cfg=no_std_atomic64");
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}
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if minor < 34 || !has_atomic32 {
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println!("cargo:rustc-cfg=no_std_atomic");
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}
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}
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// Support for core::ffi::CStr and alloc::ffi::CString stabilized in Rust 1.64.
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// https://blog.rust-lang.org/2022/09/22/Rust-1.64.0.html#c-compatible-ffi-types-in-core-and-alloc
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if minor < 64 {
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println!("cargo:rustc-cfg=no_core_cstr");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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let rustc = match env::var_os("RUSTC") {
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Some(rustc) => rustc,
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None => return None,
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};
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let output = match Command::new(rustc).arg("--version").output() {
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Ok(output) => output,
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Err(_) => return None,
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};
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let version = match str::from_utf8(&output.stdout) {
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Ok(version) => version,
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Err(_) => return None,
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};
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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 next = match pieces.next() {
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Some(next) => next,
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None => return None,
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};
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u32::from_str(next).ok()
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}
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