'struct' now seen using 'class'

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Hi,
I'm new to Clang / LLVM, and trying to build so that it will run natively on Windows.

Used the CMake approach (thanks to whoever created the configs for this). Had to comment out "DbgInfoRemover.cpp" in one of the make files (didn't spend time to figure out why), following which CMake produced a nice working Visual Studio 2008 solution file. I opened this up in VS 2008 Express and everything seems to build properly except for the following errors:

1>c:\llvm\utils\tablegen\TGParser.h(69) : warning C4099: 'llvm::SubClassReference' : type name first seen using 'struct' now seen using 'class'
1> c:\llvm\utils\tablegen\TGParser.h(26) : see declaration of 'llvm::SubClassReference'

1>c:\llvm\utils\tablegen\Record.h(38) : warning C4099: 'llvm::Init' : type name first seen using 'class' now seen using 'struct'
1> c:\llvm\utils\tablegen\TGParser.h(24) : see declaration of 'llvm::Init'

1>c:\llvm\utils\tablegen\Record.h(63) : warning C4099: 'llvm::RecTy' : type name first seen using 'class' now seen using 'struct'
1> c:\llvm\utils\tablegen\TGParser.h(23) : see declaration of 'llvm::RecTy'

1>c:\llvm\utils\tablegen\Record.h(425) : warning C4099: 'llvm::Init' : type name first seen using 'class' now seen using 'struct'
1> c:\llvm\utils\tablegen\TGParser.h(24) : see declaration of 'llvm::Init'

1>..\..\..\llvm\utils\TableGen\TGParser.cpp(127) : warning C4099: 'llvm::SubClassReference' : type name first seen using 'struct' now seen using 'class'
1> ..\..\..\llvm\utils\TableGen\TGParser.cpp(33) : see declaration of 'llvm::SubClassReference'

7>..\..\..\..\llvm\lib\CodeGen\SelectionDAG\SelectionDAGBuild.cpp(4636) : warning C4099: 'llvm::SDISelAsmOperandInfo' : type name first seen using 'class' now seen using 'struct'
7> c:\dj\llvm\lib\codegen\selectiondag\SelectionDAGBuild.h(64) : see declaration of 'llvm::SDISelAsmOperandInfo'

14>C:\llvm\include\llvm/Debugger/SourceLanguage.h(32) : warning C4099: 'llvm::SourceLanguage' : type name first seen using 'class' now seen using 'struct'
14> C:\llvm\include\llvm/Debugger/ProgramInfo.h(33) : see declaration of 'llvm::SourceLanguage'

16>c:\dj\llvm\lib\target\x86\asmprinter\X86ATTAsmPrinter.h(29) : warning C4099: 'llvm::MachineJumpTableInfo' : type name first seen using 'class' now seen using 'struct'
16> C:\llvm\include\llvm/CodeGen/MachineFunction.h(34) : see declaration of 'llvm::MachineJumpTableInfo'

16>c:\dj\llvm\lib\target\x86\asmprinter\X86ATTAsmPrinter.h(29) : warning C4099: 'llvm::MachineJumpTableInfo' : type name first seen using 'class' now seen using 'struct'
16> C:\llvm\include\llvm/CodeGen/MachineFunction.h(34) : see declaration of 'llvm::MachineJumpTableInfo'

Should I ignore these warnings, is this something I should fix, or should it be fixed in the source?

Thanks,

Henry