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[LTO] Make sure we flush buffers to work around linker shenanigans.

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lld, at least, doesn't call global destructors by default (unless
--full-shutdown is passed) because it's, allegedly, expensive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Davide Italiano 2017-02-13 14:39:51 +00:00
parent 2aaf4be982
commit 92b9c72ccb
1 changed files with 17 additions and 2 deletions
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19
lib/LTO/LTOBackend.cpp
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@ -340,6 +340,16 @@ Expected<const Target *> initAndLookupTarget(Config &C, Module &Mod) {
}
static void
finalizeOptimizationRemarks(std::unique_ptr<tool_output_file> DiagOutputFile) {
// Make sure we flush the diagnostic remarks file in case the linker doesn't
// call the global destructors before exiting.
if (!DiagOutputFile)
return;
DiagOutputFile->keep();
DiagOutputFile->os().flush();
}
static void handleAsmUndefinedRefs(Module &Mod, TargetMachine &TM) {
// Collect the list of undefined symbols used in asm and update
// llvm.compiler.used to prevent optimization to drop these from the output.
@ -371,10 +381,14 @@ Error lto::backend(Config &C, AddStreamFn AddStream,
Mod->getContext(), C.RemarksFilename, C.RemarksWithHotness);
if (!DiagFileOrErr)
return DiagFileOrErr.takeError();
auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
if (!C.CodeGenOnly)
if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false, CombinedIndex))
if (!C.CodeGenOnly) {
if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false, CombinedIndex)) {
finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
return Error::success();
}
}
if (ParallelCodeGenParallelismLevel == 1) {
codegen(C, TM.get(), AddStream, 0, *Mod);
@ -382,6 +396,7 @@ Error lto::backend(Config &C, AddStreamFn AddStream,
splitCodeGen(C, TM.get(), AddStream, ParallelCodeGenParallelismLevel,
std::move(Mod));
}
finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
return Error::success();
}