LTO: expose LTO_SYMBOL_COMDAT flag, which indicates that the definition is part of a comdat group.

Reviewers: rafael

Subscribers: llvm-commits, ruiu

Differential Revision: http://reviews.llvm.org/D10330

llvm-svn: 239559

llvm/include/llvm-c/lto.h

@@ -62,7 +62,8 @@ typedef enum {
     LTO_SYMBOL_SCOPE_HIDDEN                = 0x00001000,
     LTO_SYMBOL_SCOPE_PROTECTED             = 0x00002000,
     LTO_SYMBOL_SCOPE_DEFAULT               = 0x00001800,
-    LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800
+    LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
+    LTO_SYMBOL_COMDAT                      = 0x00004000
 } lto_symbol_attributes;
 
 /**

llvm/lib/LTO/LTOModule.cpp

@@ -468,6 +468,9 @@ void LTOModule::addDefinedSymbol(const char *Name, const GlobalValue *def,
   else
     attr |= LTO_SYMBOL_SCOPE_DEFAULT;
 
+  if (def->hasComdat())
+    attr |= LTO_SYMBOL_COMDAT;
+
   auto Iter = _defines.insert(Name).first;
 
   // fill information structure