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-rw-r--r--lib/Linker/LinkModules.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Linker/LinkModules.cpp b/lib/Linker/LinkModules.cpp
index 3b8928a324..c358a0ad72 100644
--- a/lib/Linker/LinkModules.cpp
+++ b/lib/Linker/LinkModules.cpp
@@ -606,7 +606,8 @@ void ModuleLinker::computeTypeMapping() {
// Check to see if there is a dot in the name followed by a digit.
size_t DotPos = ST->getName().rfind('.');
if (DotPos == 0 || DotPos == StringRef::npos ||
- ST->getName().back() == '.' || !isdigit(ST->getName()[DotPos+1]))
+ ST->getName().back() == '.' ||
+ !isdigit(static_cast<unsigned char>(ST->getName()[DotPos+1])))
continue;
// Check to see if the destination module has a struct with the prefix name.