[LLVMbugs] [Bug 6523] New: Externally visible global gets wrong name

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6523

           Summary: Externally visible global gets wrong name
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


If I build LLVM with g++ and dragonegg with clang++ then I get a link failure
because g++ and clang++ disagree over some symbol names:

$ clang++ -S -O2 llvm-backend.ii -o - | grep Registry
    movq    $createLinearScanRegisterAllocator, Registry(%rip)
$ g++ -S -O2 llvm-backend.ii -o - | grep Registry
    movq    $_ZN4llvm33createLinearScanRegisterAllocatorEv,
_ZN4llvm16RegisterRegAlloc8RegistryE(%rip)

Reduced testcase follows:

namespace std __attribute__ ((__visibility__ ("default"))) {
# 202 "/usr/local/include/llvm/OperandTraits.h" 3 4
}

namespace llvm {
  class Pass {
  };
  class FunctionPass : public Pass {
  };
  FunctionPass *createLinearScanRegisterAllocator();
  typedef void *(*MachinePassCtor)();
  class MachinePassRegistryNode {
  };
  class MachinePassRegistry {
    MachinePassCtor Default;
public:
    MachinePassRegistryNode *getList() {
    }
    void setDefault(MachinePassCtor C) {
      Default = C;
    }
  };
  class RegisterRegAlloc : public MachinePassRegistryNode {
public:
    typedef FunctionPass *(*FunctionPassCtor)();
    static MachinePassRegistry Registry;
    static void setDefault(FunctionPassCtor C) {
      Registry.setDefault((MachinePassCtor)C);
    }
  };
}

void LazilyInitializeModule(void) {
  llvm::RegisterRegAlloc::setDefault(llvm::createLinearScanRegisterAllocator);
}

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