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flac/m4/really_gcc.m4

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Detect Clang masquerading as GCC. Autoconf detects the Clang compiler as GNU GCC (clang sets defines like __GNUC__ etc) but Clang is *not* completely compatible. If we detect Clang we set ac_vc_c_compiler_gnu to 'no'.
2013-11-22 11:13:36 +04:00
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
Update configure.ac and m4 files with autoupdate 2.60 Starting with autoconf 2.70, obsolescence warnings are output by default. To keep the script as compatible as possible, I build autoconf 2.60 and ran the autoupdate that came with it on configure.ac and all m4 files.
2021-12-30 20:33:02 +03:00
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
Detect Clang masquerading as GCC. Autoconf detects the Clang compiler as GNU GCC (clang sets defines like __GNUC__ etc) but Clang is *not* completely compatible. If we detect Clang we set ac_vc_c_compiler_gnu to 'no'.
2013-11-22 11:13:36 +04:00
#include <stdio.h>
Update configure.ac and m4 files with autoupdate 2.60 Starting with autoconf 2.70, obsolescence warnings are output by default. To keep the script as compatible as possible, I build autoconf 2.60 and ran the autoupdate that came with it on configure.ac and all m4 files.
2021-12-30 20:33:02 +03:00
]], [[
Detect Clang masquerading as GCC. Autoconf detects the Clang compiler as GNU GCC (clang sets defines like __GNUC__ etc) but Clang is *not* completely compatible. If we detect Clang we set ac_vc_c_compiler_gnu to 'no'.
2013-11-22 11:13:36 +04:00
#ifdef __clang__
This is clang!
#endif
Update configure.ac and m4 files with autoupdate 2.60 Starting with autoconf 2.70, obsolescence warnings are output by default. To keep the script as compatible as possible, I build autoconf 2.60 and ran the autoupdate that came with it on configure.ac and all m4 files.
2021-12-30 20:33:02 +03:00
]])],[ac_cv_c_compiler_gnu=yes],[ac_cv_c_compiler_gnu=no
])
Detect Clang masquerading as GCC. Autoconf detects the Clang compiler as GNU GCC (clang sets defines like __GNUC__ etc) but Clang is *not* completely compatible. If we detect Clang we set ac_vc_c_compiler_gnu to 'no'.
2013-11-22 11:13:36 +04:00
fi
])