[LLVMbugs] [Bug 17131] New: LLVM Toolset fails to compile SSE4A intrinsics header due to missing macro

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17131

            Bug ID: 17131
           Summary: LLVM Toolset fails to compile SSE4A intrinsics header
                    due to missing macro
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: wolfeinstein at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The Visual Studio stdlib files appear to unconditionally include ammintrin.h.
The Clang version of this file which ships with the toolset fails if __SSE4A__
is not defined. This define does not appear to originate anywhere in the VS
headers nor from Clang itself, resulting in  failure on build.

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