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conservatively limit atomic features

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This commit is contained in:
James Brown 2019-07-17 09:19:03 -07:00
parent da05163d51
commit 210c2419be
1 changed files with 17 additions and 1 deletions
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18
serde/build.rs
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@ -14,6 +14,8 @@ fn main() {
let target = env::var("TARGET").unwrap();
let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
let has_atomic_integers = target_has_at_least_atomic_u64(&target);
// std::collections::Bound was stabilized in Rust 1.17
// but it was moved to core::ops later in Rust 1.26:
// https://doc.rust-lang.org/core/ops/enum.Bound.html
@ -69,7 +71,7 @@ fn main() {
println!("cargo:rustc-cfg=num_nonzero");
}
if minor >= 34 {
if minor >= 34 && has_atomic_integers {
println!("cargo:rustc-cfg=std_integer_atomics");
}
}
@ -102,3 +104,17 @@ fn rustc_minor_version() -> Option<u32> {
u32::from_str(next).ok()
}
fn target_has_at_least_atomic_u64(target: &str) -> bool {
// The cfg variable target_has_atomic is unstable
// so this data comes from the src/librustc_target/spec/*.rs
// files in the rust source. Generally, it's 64-bit platforms
// plus i686.
if target.starts_with("x86-64") || target.starts_with("i686") ||
target.starts_with("aarch64") || target.starts_with("powerpc64") ||
target.starts_with("sparc64") || target.starts_with("mips64el") {
true
} else {
false
}
}