65 lines
1.9 KiB
Rust
65 lines
1.9 KiB
Rust
// Copyright (c) The camino Contributors
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// SPDX-License-Identifier: MIT OR Apache-2.0
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//! Adapted from
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//! https://github.com/dtolnay/syn/blob/a54fb0098c6679f1312113ae2eec0305c51c7390/build.rs.
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use std::{env, process::Command, str};
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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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let compiler = match rustc_version() {
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Some(compiler) => compiler,
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None => return,
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};
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// NOTE:
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// Adding a new cfg gated by Rust version MUST be accompanied by an addition to the matrix in
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// .github/workflows/ci.yml.
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if compiler.minor >= 44 {
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println!("cargo:rustc-cfg=path_buf_capacity");
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}
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if compiler.minor >= 56 {
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println!("cargo:rustc-cfg=shrink_to");
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}
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// Stable and beta 1.63 have a stable try_reserve_2.
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if (compiler.minor >= 63
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&& (compiler.channel == ReleaseChannel::Stable || compiler.channel == ReleaseChannel::Beta))
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|| compiler.minor >= 64
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{
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println!("cargo:rustc-cfg=try_reserve_2");
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}
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}
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struct Compiler {
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minor: u32,
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channel: ReleaseChannel,
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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enum ReleaseChannel {
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Stable,
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Beta,
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Nightly,
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}
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fn rustc_version() -> Option<Compiler> {
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let rustc = env::var_os("RUSTC")?;
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let output = Command::new(rustc).arg("--version").output().ok()?;
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let version = 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()?.parse().ok()?;
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let channel = if version.contains("nightly") {
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ReleaseChannel::Nightly
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} else if version.contains("beta") {
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ReleaseChannel::Beta
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} else {
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ReleaseChannel::Stable
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};
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Some(Compiler { minor, channel })
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}
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