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