Add static cast to unsigned char whenever a character classification function is called with a signed char argument, in order to avoid assertions in Windows Debug configuration.

llvm-svn: 175006

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 3b8928a3245..c358a0ad72b 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/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.