cannam@125: dnl @synopsis MN_GCC_REALLY_IS_GCC
cannam@125: dnl
cannam@125: dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
cannam@125: dnl @version 1.0	Oct 31 2013
cannam@125: dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
cannam@125: dnl
cannam@125: dnl Permission to use, copy, modify, distribute, and sell this file for any
cannam@125: dnl purpose is hereby granted without fee, provided that the above copyright
cannam@125: dnl and this permission notice appear in all copies.  No representations are
cannam@125: dnl made about the suitability of this software for any purpose.  It is
cannam@125: dnl provided "as is" without express or implied warranty.
cannam@125: dnl
cannam@125: 
cannam@125: # If the configure script has already detected GNU GCC, then make sure it
cannam@125: # isn't CLANG masquerading as GCC.
cannam@125: 
cannam@125: AC_DEFUN([MN_GCC_REALLY_IS_GCC],
cannam@125: [	AC_LANG_ASSERT(C)
cannam@125: 	if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
cannam@125: 		AC_TRY_LINK([
cannam@125: 			#include <stdio.h>
cannam@125: 			],
cannam@125: 			[
cannam@125: 			#ifdef __clang__
cannam@125: 				This is clang!
cannam@125: 			#endif
cannam@125: 			],
cannam@125: 		ac_cv_c_compiler_gnu=yes,
cannam@125: 		ac_cv_c_compiler_gnu=no
cannam@125: 		)
cannam@125: 		fi
cannam@125: 
cannam@125: ])