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Use correct pipeline for LTO at O0

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Unlike the pre-link piplines, the LTO pipelines do support O0,
and using them is required to avoid leaving behind undefined
references for the linker.
This commit is contained in:
Nikita Popov 2021-09-13 18:18:59 +02:00
parent be01f42f73
commit 074bbc6b87
1 changed files with 4 additions and 1 deletions
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5
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -1004,7 +1004,10 @@ LLVMRustOptimizeWithNewPassManager(
#endif
bool NeedThinLTOBufferPasses = UseThinLTOBuffers;
if (!NoPrepopulatePasses) {
if (OptLevel == OptimizationLevel::O0) {
// The pre-link pipelines don't support O0 and require using budilO0DefaultPipeline() instead.
// At the same time, the LTO pipelines do support O0 and using them is required.
bool IsLTO = OptStage == LLVMRustOptStage::ThinLTO || OptStage == LLVMRustOptStage::FatLTO;
if (OptLevel == OptimizationLevel::O0 && !IsLTO) {
#if LLVM_VERSION_GE(12, 0)
for (const auto &C : PipelineStartEPCallbacks)
PB.registerPipelineStartEPCallback(C);