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Rollup merge of #93969 - bjorn3:codegen_backend_dep_info, r=pnkfelix

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Only add codegen backend to dep info if -Zbinary-dep-depinfo is used

I am currently migrating the cg_clif build system from using a binary linked to the codegen backend as rustc replacement to passing `-Zcodegen-backend` instead. Without this PR this would force cargo to rebuild the sysroot on any change to the codegen backend even if I explicitly specify that I want it to be preserved, which would make development of cg_clif a lot slower. If you still want to have changes to the codegen backend invalidate the cargo build cache you can explicitly specify `-Zbinary-dep-depinfo`.

cc ``@eddyb`` as the codegen backend was initially added to the depinfo for rust-gpu.
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Dylan DPC 2022-04-16 07:12:42 +02:00 • committed by GitHub
commit d14bda48d5
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2 changed files with 25 additions and 6 deletions
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12
compiler/rustc_interface/src/passes.rs
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@ -629,11 +629,15 @@ fn write_out_deps(
});
files.extend(extra_tracked_files);
if let Some(ref backend) = sess.opts.debugging_opts.codegen_backend {
files.push(backend.to_string());
}
if sess.binary_dep_depinfo() {
if let Some(ref backend) = sess.opts.debugging_opts.codegen_backend {
if backend.contains('.') {
// If the backend name contain a `.`, it is the path to an external dynamic
// library. If not, it is not a path.
files.push(backend.to_string());
}
}
boxed_resolver.borrow_mut().access(|resolver| {
for cnum in resolver.cstore().crates_untracked() {
let source = resolver.cstore().crate_source_untracked(cnum);