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-rw-r--r--llvm/lib/LTO/LTOCodeGenerator.cpp21
1 files changed, 19 insertions, 2 deletions
diff --git a/llvm/lib/LTO/LTOCodeGenerator.cpp b/llvm/lib/LTO/LTOCodeGenerator.cpp
index 1980965b169..a7dad55a819 100644
--- a/llvm/lib/LTO/LTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/LTOCodeGenerator.cpp
@@ -351,7 +351,7 @@ std::unique_ptr<TargetMachine> LTOCodeGenerator::createTargetMachine() {
// If a linkonce global is present in the MustPreserveSymbols, we need to make
// sure we honor this. To force the compiler to not drop it, we add it to the
// "llvm.compiler.used" global.
-static void preserveDiscardableGVs(
+void LTOCodeGenerator::preserveDiscardableGVs(
Module &TheModule,
llvm::function_ref<bool(const GlobalValue &)> mustPreserveGV) {
SetVector<Constant *> UsedValuesSet;
@@ -368,7 +368,17 @@ static void preserveDiscardableGVs(
return;
if (!mustPreserveGV(GV))
return;
- assert(!GV.hasAvailableExternallyLinkage() && !GV.hasInternalLinkage());
+ if (GV.hasAvailableExternallyLinkage()) {
+ emitWarning(
+ (Twine("Linker asked to preserve available_externally global: '") +
+ GV.getName() + "'").str());
+ return;
+ }
+ if (GV.hasInternalLinkage()) {
+ emitWarning((Twine("Linker asked to preserve internal global: '") +
+ GV.getName() + "'").str());
+ return;
+ }
UsedValuesSet.insert(ConstantExpr::getBitCast(&GV, i8PTy));
};
for (auto &GV : TheModule)
@@ -643,3 +653,10 @@ void LTOCodeGenerator::emitError(const std::string &ErrMsg) {
else
Context.diagnose(LTODiagnosticInfo(ErrMsg));
}
+
+void LTOCodeGenerator::emitWarning(const std::string &ErrMsg) {
+ if (DiagHandler)
+ (*DiagHandler)(LTO_DS_WARNING, ErrMsg.c_str(), DiagContext);
+ else
+ Context.diagnose(LTODiagnosticInfo(ErrMsg, DS_Warning));
+}
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