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dnl Check to see if the C compiler is clang or llvm-gcc
dnl
AC_DEFUN([FP_CC_LLVM_BACKEND],
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([whether C compiler has an LLVM back end])
$CC -x c /dev/null -dM -E > conftest.txt 2>&1
if grep "__llvm__" conftest.txt >/dev/null 2>&1; then
AC_DEFINE([CC_LLVM_BACKEND], [1], [Define (to 1) if C compiler has an LLVM back end])
CcLlvmBackend=YES
AC_MSG_RESULT([yes])
else
CcLlvmBackend=NO
AC_MSG_RESULT([no])
fi
AC_SUBST(CcLlvmBackend)
rm -f conftest.txt
])
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