Jim, please take a look at this. This is most likely due to not using the Mangler interface when generating
references to globals.

-Chris

Mark would you attach your objc_instance.s.

objc_instance.s

Index: lib/CodeGen/AsmPrinter.cpp

====
RCS file: /var/cvs/llvm/llvm/lib/CodeGen/AsmPrinter.cpp,v
retrieving revision 1.116
diff -u -1 -0 -d -r1.116 AsmPrinter.cpp
--- lib/CodeGen/AsmPrinter.cpp 1 Nov 2006 09:23:08 -0000
1.116
+++ lib/CodeGen/AsmPrinter.cpp 20 Nov 2006 20:28:17 -0000
@@ -327,23 +327,31 @@
// Emit the function pointer.
EmitGlobalConstant(CS->getOperand(1));
}
}

/// getGlobalLinkName - Returns the asm/link name of of the specified
/// global variable. Should be overridden by each target asm printer to
/// generate the appropriate value.
const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
std::string LinkName;

• // Default action is to use a global symbol.
• LinkName = TAI->getGlobalPrefix();
• LinkName += GV->getName();

• if (isa(GV)) {
• LinkName += TAI->getFunctionAddrPrefix();
• LinkName += Mang->getValueName(GV);
• LinkName += TAI->getFunctionAddrSuffix();
• } else {
• LinkName += TAI->getGlobalVarAddrPrefix();
• LinkName += Mang->getValueName(GV);
• LinkName += TAI->getGlobalVarAddrSuffix();
• }
• return LinkName;
  }

// EmitAlignment - Emit an alignment directive to the specified power of two.
void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
if (GV && GV->getAlignment())
NumBits = Log2_32(GV->getAlignment());
if (NumBits == 0) return; // No need to emit alignment.
if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
O << TAI->getAlignDirective() << NumBits << "\n";

Thanks for the quick fix Jim.

mentioned in issue llvm/llvm-bugzilla-archive#1504