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dnl Check to see if the C compiler is clang and which version it is
dnl
AC_DEFUN([AX_CC_CLANG],[
AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([whether C compiler is clang])
CC_CLANG_VERSION=$(
$CC -x c -dM -E /dev/null | \
$GREP '__clang_version__' | \
$GREP -o '".*"' | \
$SED 's/^"\(.*\)"$/\1/g'
)
AC_SUBST([CC_CLANG_VERSION])
if test -n "$CC_CLANG_VERSION"; then
AC_MSG_RESULT([$CC_CLANG_VERSION])
else
AC_MSG_RESULT([no])
fi
])
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