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- 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_LINK_IFELSE([AC_LANG_PROGRAM([[
- #include <stdio.h>
- ]], [[
- #ifdef __clang__
- This is clang!
- #endif
- ]])],[ac_cv_c_compiler_gnu=yes],[ac_cv_c_compiler_gnu=no
- ])
- fi
- ])
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