[LLVMbugs] [Bug 8389] New: Global Variable Optimizer transforms OcamlGCPrinter.cpp incorrectly

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8389

           Summary: Global Variable Optimizer transforms
                    OcamlGCPrinter.cpp incorrectly
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: foldr at codedgers.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5622)
 --> (http://llvm.org/bugs/attachment.cgi?id=5622)
OcamlGCPrinter.O0.bc

When trying to compile LLVM 2.8 with llvm-gcc on Windows I encountered the
following error:

c:/code/codedgers/evaluation-2.8/obj/Release/lib/libLLVMAsmPrinter.a(AsmPrinter.
o):fake:(.bss$linkonce__ZN4llvm8RegistryINS_17GCMetadataPrinterENS_14RegistryTra
itsIS1_EEE4HeadE+0x0): multiple definition of
`llvm::Registry<llvm::GCMetadataPr
inter, llvm::RegistryTraits<llvm::GCMetadataPrinter> >::Head'

c:/code/codedgers/evaluation-2.8/obj/Release/lib/libLLVMAsmPrinter.a(OcamlGCPrin
ter.o):fake:(.data$linkonce__ZN4llvm8RegistryINS_17GCMetadataPrinterENS_14Regist
ryTraitsIS1_EEE4HeadE+0x0): first defined here

Taking a look at the bytecode:

OcamlGCPrinter.ll:

@_ZN4llvm8RegistryINS_17GCMetadataPrinterENS_14RegistryTraitsIS1_EEE4HeadE =
weak_odr global
%"struct.llvm::Registry<llvm::GCMetadataPrinter,llvm::RegistryTraits<llvm::GCMetadataPrinter>
>::node"* getelementptr inbounds
(%"struct.llvm::Registry<llvm::GCMetadataPrinter,llvm::RegistryTraits<llvm::GCMetadataPrinter>
>::Add<<unnamed>::OcamlGCMetadataPrinter>"* @_ZL1Y, i32 0, i32 1)

AsmPrinter.ll:

@_ZN4llvm8RegistryINS_17GCMetadataPrinterENS_14RegistryTraitsIS1_EEE4HeadE =
weak_odr global
%"struct.llvm::Registry<llvm::GCMetadataPrinter,llvm::RegistryTraits<llvm::GCMetadataPrinter>
>::node"* null

However, when compiled with -O0, the relevant fragment of OcamlGCPrinter.ll
looks like this:

@_ZN4llvm8RegistryINS_17GCMetadataPrinterENS_14RegistryTraitsIS1_EEE4HeadE =
weak_odr global
%"struct.llvm::Registry<llvm::GCMetadataPrinter,llvm::RegistryTraits<llvm::GCMetadataPrinter>
>::node"* null

Running opt with -print-after-all showed that -globalopt is to blame. Attached
are both -O0 and -O2 versions of OCamlGCPrinter.bc

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