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comparison acinclude/ax_check_compiler_flags.m4 @ 5029:5d7d48157be7

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Greg Jandl to SDL I did some digging, and I think I've found a better solution. By including some additional .m4 macros in the acinclude directory (http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html, http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html and http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html) then using the patch below (same as previous patch + one line change to configure.in), SDL will build correctly out of the box. The arch can then be overridden by --with-gcc-arch=<arch> (most will probably want to build with i686 there for general distribution) or --without-gcc-arch, to disable setting the arch all together. On my Atom netbook, I get -march=PentiumPro by default, which works great, as does --with-gcc-arch=i686.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 22:40:45 -0800
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1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
8 #
9 # DESCRIPTION
10 #
11 # Check whether the given compiler FLAGS work with the current language's
12 # compiler, or whether they give an error. (Warnings, however, are
13 # ignored.)
14 #
15 # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
16 # success/failure.
17 #
18 # LICENSE
19 #
20 # Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
21 # Copyright (c) 2009 Matteo Frigo
22 #
23 # This program is free software: you can redistribute it and/or modify it
24 # under the terms of the GNU General Public License as published by the
25 # Free Software Foundation, either version 3 of the License, or (at your
26 # option) any later version.
27 #
28 # This program is distributed in the hope that it will be useful, but
29 # WITHOUT ANY WARRANTY; without even the implied warranty of
30 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
31 # Public License for more details.
32 #
33 # You should have received a copy of the GNU General Public License along
34 # with this program. If not, see <http://www.gnu.org/licenses/>.
35 #
36 # As a special exception, the respective Autoconf Macro's copyright owner
37 # gives unlimited permission to copy, distribute and modify the configure
38 # scripts that are the output of Autoconf when processing the Macro. You
39 # need not follow the terms of the GNU General Public License when using
40 # or distributing such scripts, even though portions of the text of the
41 # Macro appear in them. The GNU General Public License (GPL) does govern
42 # all other use of the material that constitutes the Autoconf Macro.
43 #
44 # This special exception to the GPL applies to versions of the Autoconf
45 # Macro released by the Autoconf Archive. When you make and distribute a
46 # modified version of the Autoconf Macro, you may extend this special
47 # exception to the GPL to apply to your modified version as well.
48
49 #serial 9
50
51 AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
52 [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
53 AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
54 dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
55 AS_LITERAL_IF([$1],
56 [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
57 ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
58 _AC_LANG_PREFIX[]FLAGS="$1"
59 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
60 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
61 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
62 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
63 [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
64 _AC_LANG_PREFIX[]FLAGS="$1"
65 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
66 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
67 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
68 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
69 eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
70 AC_MSG_RESULT($ax_check_compiler_flags)
71 if test "x$ax_check_compiler_flags" = xyes; then
72 m4_default([$2], :)
73 else
74 m4_default([$3], :)
75 fi
76 ])dnl AX_CHECK_COMPILER_FLAGS