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// SPDX-License-Identifier: Apache-2.0 OR MIT
// The rustc-cfg emitted by the build script are *not* public API.
// version.rs is shared with portable-atomic's build script, and portable-atomic-util only uses a part of it.
#[allow(dead_code)]
#[path = "version.rs"]
mod version;
use version::{rustc_version, Version};
use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=version.rs");
let version = match rustc_version() {
Some(version) => version,
None => {
if env::var_os("PORTABLE_ATOMIC_DENY_WARNINGS").unwrap_or_default() == "1" {
panic!("unable to determine rustc version")
}
println!(
"cargo:warning={}: unable to determine rustc version; assuming latest stable rustc (1.{})",
env!("CARGO_PKG_NAME"),
Version::LATEST.minor
);
Version::LATEST
}
};
if version.minor >= 80 {
// Custom cfgs set by build script. Not public API.
// grep -E 'cargo:rustc-cfg=' build.rs | grep -v '=//' | sed -E 's/^.*cargo:rustc-cfg=//; s/(=\\)?".*$//' | LC_ALL=C sort -u | tr '\n' ','
println!(
"cargo:rustc-check-cfg=cfg(portable_atomic_no_alloc,portable_atomic_no_alloc_layout_extras,portable_atomic_no_core_unwind_safe,portable_atomic_no_error_in_core,portable_atomic_no_futures_api,portable_atomic_no_io_safety,portable_atomic_no_io_vec,portable_atomic_no_min_const_generics,portable_atomic_no_unsafe_op_in_unsafe_fn,portable_atomic_sanitize_thread)"
);
}
// Note that this is `no_`*, not `has_*`. This allows treating as the latest
// stable rustc is used when the build script doesn't run. This is useful
// for non-cargo build systems that don't run the build script.
// alloc stabilized in Rust 1.36 (nightly-2019-04-15) https://github.com/rust-lang/rust/pull/59675
if !version.probe(36, 2019, 4, 14) {
println!("cargo:rustc-cfg=portable_atomic_no_alloc");
}
// std::{future,task} stabilized in Rust 1.36 (nightly-2019-04-25) https://github.com/rust-lang/rust/pull/59739
if !version.probe(36, 2019, 4, 24) {
println!("cargo:rustc-cfg=portable_atomic_no_futures_api");
}
// {read,write}_vectored stabilized in Rust 1.36 (nightly-2019-04-30) https://github.com/rust-lang/rust/pull/60334
if !version.probe(36, 2019, 4, 29) {
println!("cargo:rustc-cfg=portable_atomic_no_io_vec");
}
// Layout::{align_to,pad_to_align,extend,array} stabilized in Rust 1.44 (nightly-2020-04-22) https://github.com/rust-lang/rust/pull/69362
if !version.probe(44, 2020, 4, 21) {
println!("cargo:rustc-cfg=portable_atomic_no_alloc_layout_extras");
}
// min_const_generics stabilized in Rust 1.51 (nightly-2020-12-28): https://github.com/rust-lang/rust/pull/79135
if !version.probe(51, 2020, 12, 27) {
println!("cargo:rustc-cfg=portable_atomic_no_min_const_generics");
}
// unsafe_op_in_unsafe_fn stabilized in Rust 1.52 (nightly-2021-03-11): https://github.com/rust-lang/rust/pull/79208
if !version.probe(52, 2021, 3, 10) {
println!("cargo:rustc-cfg=portable_atomic_no_unsafe_op_in_unsafe_fn");
}
// https://github.com/rust-lang/rust/pull/84662 merged in Rust 1.56 (nightly-2021-08-02).
if !version.probe(56, 2021, 8, 1) {
println!("cargo:rustc-cfg=portable_atomic_no_core_unwind_safe");
}
// io_safety stabilized in Rust 1.63 (nightly-2022-06-16): https://github.com/rust-lang/rust/pull/95118
if !version.probe(63, 2022, 6, 15) {
println!("cargo:rustc-cfg=portable_atomic_no_io_safety");
}
// error_in_core stabilized in Rust 1.81 (nightly-2024-06-09): https://github.com/rust-lang/rust/pull/125951
if !version.probe(81, 2024, 6, 8) {
println!("cargo:rustc-cfg=portable_atomic_no_error_in_core");
}
if version.nightly {
// `cfg(sanitize = "..")` is not stabilized.
let sanitize = env::var("CARGO_CFG_SANITIZE").unwrap_or_default();
if sanitize.contains("thread") {
println!("cargo:rustc-cfg=portable_atomic_sanitize_thread");
}
}
}