Work around gold bug http://sourceware.org/PR16794.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205416 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/ELFObjectWriter.cpp

@@ -796,6 +796,11 @@ bool ELFObjectWriter::shouldRelocateWithSymbol(const MCSymbolRefExpr *RefA,
   if (Flags & ELF::SHF_MERGE) {
     if (C != 0)
       return true;
+
+    // It looks like gold has a bug (http://sourceware.org/PR16794) and can
+    // only handle section relocations to mergeable sections if using RELA.
+    if (!hasRelocationAddend())
+      return true;
   }
 
   // Most TLS relocations use a got, so they need the symbol. Even those that