[LLVMbugs] [Bug 17033] New: WindowsToolChain failed to find VS installation when compiled as 64-bit code

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17033

            Bug ID: 17033
           Summary: WindowsToolChain failed to find VS installation when
                    compiled as 64-bit code
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mingxiang.xu at autodesk.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

WindowsToolChain.cpp queries registry for VS installation. When compiled as
32-bit code, it looks at HKEY_LOCAL_MACHINE\SOTWARE\Microsoft\VisualStudio.
This works well.

If WindowsToolChain.cpp is compiled as 64-bit code, it fails to find VS
installation because the registry is actually stored in
HKEY_LOCAL_MACHINE\SOTWARE\Wow6432Node\Microsoft\VisualStudio. Visual Studio is
a 32-bit appliation.

It would be helpful to add KEY_WOW64_32KEY flag to RegOpenKeyEx or check
IsWow64Process() so that it can find the correct registry key in Wow6432Node.

Not for this bug, it would be nice to add VS110COMNTOOLS environemnt var check
as a fallback.

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