[LLVMbugs] [Bug 20408] New: LLVM_ENABLE_FFI=ON build fails on reconfigure

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20408

            Bug ID: 20408
           Summary: LLVM_ENABLE_FFI=ON build fails on reconfigure
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: josh.klontz at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

At least on OS X 10.9 with CMake 2.8.12.2:

$ cmake -DLLVM_ENABLE_FFI=ON ..
$ make # build completes without errors
$ cmake -DLLVM_ENABLE_FFI=ON ..
$ make
...

/Users/m29396/likely/llvm/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp:39:10:
fatal error: 
      'ffi.h' file not found
#include <ffi.h>
         ^
1 error generated.


`HAVE_FFI_H` seems to be incorrectly set after rerunning CMake. This is a
possible duplicate of #19528.

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