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