[LLVMbugs] [Bug 23935] New: Bootstrapping clang fails because of emmintrin.h

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23935

            Bug ID: 23935
           Summary: Bootstrapping clang fails because of emmintrin.h
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bero at linaro.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14512
  --> https://llvm.org/bugs/attachment.cgi?id=14512&action=edit
fix

When using cmake to bootstrap clang (crosscompiling the entire
llvm+clang+libc++ combo), the build fails because various files in (at least)
tools/clang/lib/Base and tools/clang/lib/Lex try to #include <emmintrin.h>,
which is part of clang and therefore doesn't exist in the target sysroot yet.

The patch I'm attaching fixes the problem for me by making clang look for
headers in its source directory.

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