Merge from mainline.

Revert the part of 45848 that treated weak globals
as weak globals rather than commons.  While not wrong,
this change tickled a latent bug in Darwin's strip,
so revert it for now as a workaround.

llvm-svn: 46167

Author: tlattner

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -917,7 +917,8 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
 
     if (C->isNullValue() && /* FIXME: Verify correct */
         !I->hasSection() &&
-        (I->hasInternalLinkage() || I->hasExternalLinkage())) {
+        (I->hasInternalLinkage() || I->hasWeakLinkage() ||
+         I->hasLinkOnceLinkage() || I->hasExternalLinkage())) {
       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
       if (I->hasExternalLinkage()) {
         O << "\t.globl " << name << '\n';

llvm/lib/Target/X86/X86AsmPrinter.cpp

@@ -181,9 +181,8 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
       }
 
       if (!I->isThreadLocal() &&
-          (I->hasInternalLinkage() || 
-           (!Subtarget->isTargetDarwin() && 
-            (I->hasWeakLinkage() || I->hasLinkOnceLinkage())))) {
+          (I->hasInternalLinkage() || I->hasWeakLinkage() ||
+           I->hasLinkOnceLinkage())) {
         if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
         if (!NoZerosInBSS && TAI->getBSSSection())
           SwitchToDataSection(TAI->getBSSSection(), I);