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-rw-r--r--lib/CodeGen/Mangle.cpp5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index c09a13a59f..6ee1223a00 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -93,8 +93,9 @@ bool CXXNameMangler::mangleFunctionDecl(const FunctionDecl *FD) {
!Context.getLangOptions().CPlusPlus ||
// "main" is not mangled in C++
FD->isMain() ||
- // No mangling in an "implicit extern C" header.
- Context.getSourceManager().getFileCharacteristic(FD->getLocation())
+ // No mangling in an "implicit extern C" header.
+ (FD->getLocation().isValid() &&
+ Context.getSourceManager().getFileCharacteristic(FD->getLocation()))
== SrcMgr::C_ExternCSystem ||
// No name mangling in a C linkage specification.
isInCLinkageSpecification(FD))