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build: Fix c-b builds always being marked dirty

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This commit is contained in:
Trevor Gross
2026-04-07 07:07:59 -05:00
parent f5ca8e59fb
commit 2df972607e
1 changed files with 11 additions and 2 deletions
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library/compiler-builtins/compiler-builtins/build.rs
+11 -2
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@@ -6,10 +6,19 @@
use configure::{Config, Library, set_cfg};
fn main() {
println!("cargo::rerun-if-changed=build.rs");
let cfg = Config::from_env(Library::CompilerBuiltins);
// Work around building as part of `builtins-shim`: if only `build.rs` is used, Cargo always
// considers the build dirty because `builtins-shim/build.rs` does not exist. If only
// `../c-b/build.rs` is used, the same may happen if not built in the workspace.
if cfg.manifest_dir.file_name().unwrap() == "builtins-shim" {
println!("cargo::rerun-if-changed=../compiler-builtins/build.rs");
} else {
println!("cargo::rerun-if-changed=build.rs");
}
println!("cargo::rerun-if-changed=../libm/configure.rs");
let cfg = Config::from_env(Library::CompilerBuiltins);
configure::emit(&cfg);
configure_check_cfg();