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|
//! This build script detects target platforms that lack proper support for
//! atomics and sets `cfg` flags accordingly.
use std::env;
use std::str;
fn main() {
let target = match rustc_target() {
Some(target) => target,
None => return,
};
if target_has_atomic_cas(&target) {
println!("cargo:rustc-cfg=atomic_cas");
}
if target_has_atomics(&target) {
println!("cargo:rustc-cfg=has_atomics");
}
println!("cargo:rerun-if-changed=build.rs");
}
fn target_has_atomic_cas(target: &str) -> bool {
match &target[..] {
"thumbv6m-none-eabi"
| "msp430-none-elf"
| "riscv32i-unknown-none-elf"
| "riscv32imc-unknown-none-elf" => false,
_ => true,
}
}
fn target_has_atomics(target: &str) -> bool {
match &target[..] {
"thumbv4t-none-eabi"
| "msp430-none-elf"
| "riscv32i-unknown-none-elf"
| "riscv32imc-unknown-none-elf" => false,
_ => true,
}
}
fn rustc_target() -> Option<String> {
env::var("TARGET").ok()
}
|
