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thinlto: only build summary file if needed

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If we don't do this, some versions of LLVM (at least 17, experimentally)
will double-emit some error messages, which is how I noticed this. Given
that it seems to be costing some extra work, let's only request the
summary bitcode production if we'll actually bother writing it down,
otherwise skip it.
This commit is contained in:
Augie Fackler 2024-05-23 14:58:30 -04:00
parent 03d5556ced
commit de8200c5a4
7 changed files with 17 additions and 14 deletions
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7
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -1492,7 +1492,7 @@ struct LLVMRustThinLTOBuffer {
};
extern "C" LLVMRustThinLTOBuffer*
LLVMRustThinLTOBufferCreate(LLVMModuleRef M, bool is_thin) {
LLVMRustThinLTOBufferCreate(LLVMModuleRef M, bool is_thin, bool emit_summary) {
auto Ret = std::make_unique<LLVMRustThinLTOBuffer>();
{
auto OS = raw_string_ostream(Ret->data);
@ -1510,7 +1510,10 @@ LLVMRustThinLTOBufferCreate(LLVMModuleRef M, bool is_thin) {
PB.registerLoopAnalyses(LAM);
PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
ModulePassManager MPM;
MPM.addPass(ThinLTOBitcodeWriterPass(OS, &ThinLinkOS));
// We only pass ThinLinkOS to be filled in if we want the summary,
// because otherwise LLVM does extra work and may double-emit some
// errors or warnings.
MPM.addPass(ThinLTOBitcodeWriterPass(OS, emit_summary ? &ThinLinkOS : nullptr));
MPM.run(*unwrap(M), MAM);
} else {
WriteBitcodeToFile(*unwrap(M), OS);