Teach the internalize pass to skip dllexported symbols because they could be

referenced in a way that even the linker does not see.

Differential Revision: http://llvm-reviews.chandlerc.com/D2280



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196300 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/Internalize.cpp

@@ -115,6 +115,10 @@ static bool shouldInternalize(const GlobalValue &GV,
   if (GV.hasAvailableExternallyLinkage())
     return false;
 
+  // Assume that dllexported symbols are referenced elsewhere
+  if (GV.hasDLLExportLinkage())
+    return false;
+
   // Already has internal linkage
   if (GV.hasLocalLinkage())
     return false;