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Diffstat (limited to 'm4/really_gcc.m4')
| -rw-r--r-- | m4/really_gcc.m4 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/m4/really_gcc.m4 b/m4/really_gcc.m4 new file mode 100644 index 0000000..8bc94d5 --- /dev/null +++ b/m4/really_gcc.m4 @@ -0,0 +1,29 @@ +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 +]) |