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-rw-r--r--llvm/lib/LTO/ThinLTOCodeGenerator.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index 33d0a0cd920..2867c730125 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -884,6 +884,11 @@ void ThinLTOCodeGenerator::run() {
auto GUIDPreservedSymbols =
computeGUIDPreservedSymbols(PreservedSymbols, TMBuilder.TheTriple);
+ // Make sure that every module has an entry in the ExportLists to enable
+ // threaded access to this map below
+ for (auto &DefinedGVSummaries : ModuleToDefinedGVSummaries)
+ ExportLists[DefinedGVSummaries.first()];
+
// Parallel optimizer + codegen
{
ThreadPool Pool(ThreadCount);
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