[LLVMbugs] [Bug 11493] New: missing unwind.h

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11493

             Bug #: 11493
           Summary: missing unwind.h
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: ASSIGNED
          Severity: enhancement
          Priority: P
         Component: Headers
        AssignedTo: rafael.espindola at gmail.com
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


This is an interesting one. GCC includes it in most systems, but on OS X Lion
it is considered part of the SDK:

/Developer/SDKs//MacOSX10.7.sdk/usr/include/unwind.h

We need this header for systems where gcc provides it, but on Lion we probably
want to use the system one.

I can see two ways of doing this. One is to install it to
lib/clang/<ver>/include/cpuid/cpuid.h and only add that directory to the search
path on systems where cpuid.h is provided by gcc. The other one is to install
it in the regular directory (lib/clang/<ver>/include) and use an #ifdef and a
#include_next to use the system one on Lion.

I will give the #ifdef option a try.

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