[LLVMbugs] [Bug 5994] New: configure might find multiple ffi.h files

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5994

           Summary: configure might find multiple ffi.h files
           Product: Build scripts
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: autoconf
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: skip at pobox.com
                CC: llvmbugs at cs.uiuc.edu


On my mac I have DarwinPorts/MacPorts installed in /opt/local.  When
configuring the Unladen Swallow project I was getting compile errors
because the configure script was finding both /usr/include/ffi/ffi.h and
/opt/local/include/ffi.h and defining both HAVE_FFI_H and HAVE_FFI_FFI_H.
I got compilation errors because (for whatever reason) the version of ffi.h
in /opt/local/include wasn't found by the compiler.  In any case, had it
found both ffi.h files I probably would have gotten some other errors.
After I deactivated the libffi port in MacPorts compilation went swimmingly.

At any rate, the configure script should define at most one of HAVE_FFI_H or
HAVE_FFI_FFI_H, no matter how many it finds.  (If both exist maybe it should
just be treated as a compilation error.)


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