mirror of
https://github.com/rust-lang/rust
synced 2024-09-15 22:50:55 +00:00
53852ee4eb
Only the android libunwind detection remains in the build script * Reduces dependence on build scripts for building the standard library * Reduces dependence on exact target names in favor of using semantic cfg(target_*) usage. * Keeps almost all code related to linking of the unwinder in one file
26 lines
851 B
Rust
26 lines
851 B
Rust
use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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println!("cargo:rerun-if-env-changed=CARGO_CFG_MIRI");
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if env::var_os("CARGO_CFG_MIRI").is_some() {
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// Miri doesn't need the linker flags or a libunwind build.
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return;
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}
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let target = env::var("TARGET").expect("TARGET was not set");
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if target.contains("android") {
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let build = cc::Build::new();
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// Since ndk r23 beta 3 `libgcc` was replaced with `libunwind` thus
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// check if we have `libunwind` available and if so use it. Otherwise
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// fall back to `libgcc` to support older ndk versions.
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let has_unwind = build.is_flag_supported("-lunwind").expect("Unable to invoke compiler");
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if has_unwind {
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println!("cargo:rustc-cfg=feature=\"system-llvm-libunwind\"");
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}
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}
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}
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