Be more strict on when we produce an undefined reference. In gas a file with

just

.type   foo,@object

will produce an undefined reference to foo. On the other hand, a file with
just

.weakref bar, foo

will not. It is somewhat hard to support both in MC since both statements
should create the symbols. It should be possible if we really need to by
adding to the flags, but hopefully that is not necessary.

With this patch we do not produce a undefined reference in any of those cases.
The assembly file needs an actual use for the undefined reference to be
present.

This is in preparation for a patch implementing .weakref.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117735 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/ELFObjectWriter.cpp

@@ -868,8 +868,11 @@ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
 
   const MCSymbol &Symbol = Data.getSymbol();
 
+  if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_")
+    return true;
+
   const MCSymbol &A = AliasedSymbol(Symbol);
-  if (&A != &Symbol && A.isUndefined())
+  if (!A.isVariable() && A.isUndefined() && !Data.isCommon())
     return false;
 
   if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined())

test/MC/ELF/alias.s

@@ -15,6 +15,7 @@ bar3 = foo3
 foo4:
 bar4 = foo4
 
+        .long foo2
 // CHECK:       # Symbol 0x00000001
 // CHECK-NEXT:  (('st_name', 0x00000005) # 'bar'
 // CHECK-NEXT:   ('st_bind', 0x00000000)

test/MC/ELF/size.s

@@ -6,4 +6,5 @@
 // CHECK-NEXT:    (('st_name', 0x00000001) # 'foo'
 // CHECK-NEXT:     ('st_bind', 0x00000001)
 
-	.size	foo, .Lbar-foo
+	.size foo, .Lbar-foo
+        .long foo

test/MC/ELF/undef.s

@@ -10,6 +10,7 @@
 
 	.type	.Lsym5,@object
         .type   sym6,@object
+        .long sym6
 
 	.section	.rodata.str1.1,"aMS",@progbits,1
 .Lsym7: