Chris@40: dnl @synopsis MN_GCC_REALLY_IS_GCC
Chris@40: dnl
Chris@40: dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
Chris@40: dnl @version 1.0	Oct 31 2013
Chris@40: dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
Chris@40: dnl
Chris@40: dnl Permission to use, copy, modify, distribute, and sell this file for any
Chris@40: dnl purpose is hereby granted without fee, provided that the above copyright
Chris@40: dnl and this permission notice appear in all copies.  No representations are
Chris@40: dnl made about the suitability of this software for any purpose.  It is
Chris@40: dnl provided "as is" without express or implied warranty.
Chris@40: dnl
Chris@40: 
Chris@40: # If the configure script has already detected GNU GCC, then make sure it
Chris@40: # isn't CLANG masquerading as GCC.
Chris@40: 
Chris@40: AC_DEFUN([MN_GCC_REALLY_IS_GCC],
Chris@40: [	AC_LANG_ASSERT(C)
Chris@40: 	if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
Chris@40: 		AC_TRY_LINK([
Chris@40: 			#include <stdio.h>
Chris@40: 			],
Chris@40: 			[
Chris@40: 			#ifdef __clang__
Chris@40: 				This is clang!
Chris@40: 			#endif
Chris@40: 			],
Chris@40: 		ac_cv_c_compiler_gnu=yes,
Chris@40: 		ac_cv_c_compiler_gnu=no
Chris@40: 		)
Chris@40: 		fi
Chris@40: 
Chris@40: ])