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comparison acinclude/ax_gcc_archflag.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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5028:fffb33ae85e8 5029:5d7d48157be7
1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE])
8 #
9 # DESCRIPTION
10 #
11 # This macro tries to guess the "native" arch corresponding to the target
12 # architecture for use with gcc's -march=arch or -mtune=arch flags. If
13 # found, the cache variable $ax_cv_gcc_archflag is set to this flag and
14 # ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is is set to
15 # "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is
16 # to add $ax_cv_gcc_archflag to the end of $CFLAGS.
17 #
18 # PORTABLE? should be either [yes] (default) or [no]. In the former case,
19 # the flag is set to -mtune (or equivalent) so that the architecture is
20 # only used for tuning, but the instruction set used is still portable. In
21 # the latter case, the flag is set to -march (or equivalent) so that
22 # architecture-specific instructions are enabled.
23 #
24 # The user can specify --with-gcc-arch=<arch> in order to override the
25 # macro's choice of architecture, or --without-gcc-arch to disable this.
26 #
27 # When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is
28 # called unless the user specified --with-gcc-arch manually.
29 #
30 # Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID
31 #
32 # (The main emphasis here is on recent CPUs, on the principle that doing
33 # high-performance computing on old hardware is uncommon.)
34 #
35 # LICENSE
36 #
37 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
38 # Copyright (c) 2008 Matteo Frigo
39 #
40 # This program is free software: you can redistribute it and/or modify it
41 # under the terms of the GNU General Public License as published by the
42 # Free Software Foundation, either version 3 of the License, or (at your
43 # option) any later version.
44 #
45 # This program is distributed in the hope that it will be useful, but
46 # WITHOUT ANY WARRANTY; without even the implied warranty of
47 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
48 # Public License for more details.
49 #
50 # You should have received a copy of the GNU General Public License along
51 # with this program. If not, see <http://www.gnu.org/licenses/>.
52 #
53 # As a special exception, the respective Autoconf Macro's copyright owner
54 # gives unlimited permission to copy, distribute and modify the configure
55 # scripts that are the output of Autoconf when processing the Macro. You
56 # need not follow the terms of the GNU General Public License when using
57 # or distributing such scripts, even though portions of the text of the
58 # Macro appear in them. The GNU General Public License (GPL) does govern
59 # all other use of the material that constitutes the Autoconf Macro.
60 #
61 # This special exception to the GPL applies to versions of the Autoconf
62 # Macro released by the Autoconf Archive. When you make and distribute a
63 # modified version of the Autoconf Macro, you may extend this special
64 # exception to the GPL to apply to your modified version as well.
65
66 #serial 8
67
68 AC_DEFUN([AX_GCC_ARCHFLAG],
69 [AC_REQUIRE([AC_PROG_CC])
70 AC_REQUIRE([AC_CANONICAL_HOST])
71
72 AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])],
73 ax_gcc_arch=$withval, ax_gcc_arch=yes)
74
75 AC_MSG_CHECKING([for gcc architecture flag])
76 AC_MSG_RESULT([])
77 AC_CACHE_VAL(ax_cv_gcc_archflag,
78 [
79 ax_cv_gcc_archflag="unknown"
80
81 if test "$GCC" = yes; then
82
83 if test "x$ax_gcc_arch" = xyes; then
84 ax_gcc_arch=""
85 if test "$cross_compiling" = no; then
86 case $host_cpu in
87 i[[3456]]86*|x86_64*) # use cpuid codes, in part from x86info-1.7 by D. Jones
88 AX_GCC_X86_CPUID(0)
89 AX_GCC_X86_CPUID(1)
90 case $ax_cv_gcc_x86_cpuid_0 in
91 *:756e6547:*:*) # Intel
92 case $ax_cv_gcc_x86_cpuid_1 in
93 *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
94 *5??:*:*:*) ax_gcc_arch=pentium ;;
95 *6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
96 *6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
97 *6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
98 *6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
99 *6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
100 *6??:*:*:*) ax_gcc_arch=pentiumpro ;;
101 *f3[[347]]:*:*:*|*f4[1347]:*:*:*)
102 case $host_cpu in
103 x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
104 *) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
105 esac ;;
106 *f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
107 esac ;;
108 *:68747541:*:*) # AMD
109 case $ax_cv_gcc_x86_cpuid_1 in
110 *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
111 *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
112 *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
113 *60?:*:*:*) ax_gcc_arch=k7 ;;
114 *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
115 *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
116 *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
117 *6[[68a]]?:*:*:*)
118 AX_GCC_X86_CPUID(0x80000006) # L2 cache size
119 case $ax_cv_gcc_x86_cpuid_0x80000006 in
120 *:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256
121 ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
122 *) ax_gcc_arch="athlon-4 athlon k7" ;;
123 esac ;;
124 *f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
125 *f5?:*:*:*) ax_gcc_arch="opteron k8" ;;
126 *f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;;
127 *f??:*:*:*) ax_gcc_arch="k8" ;;
128 esac ;;
129 *:746e6543:*:*) # IDT
130 case $ax_cv_gcc_x86_cpuid_1 in
131 *54?:*:*:*) ax_gcc_arch=winchip-c6 ;;
132 *58?:*:*:*) ax_gcc_arch=winchip2 ;;
133 *6[[78]]?:*:*:*) ax_gcc_arch=c3 ;;
134 *69?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
135 esac ;;
136 esac
137 if test x"$ax_gcc_arch" = x; then # fallback
138 case $host_cpu in
139 i586*) ax_gcc_arch=pentium ;;
140 i686*) ax_gcc_arch=pentiumpro ;;
141 esac
142 fi
143 ;;
144
145 sparc*)
146 AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/])
147 cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null`
148 cputype=`echo "$cputype" | tr -d ' -' |tr $as_cr_LETTERS $as_cr_letters`
149 case $cputype in
150 *ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;;
151 *ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;;
152 *ultrasparc*) ax_gcc_arch="ultrasparc v9" ;;
153 *supersparc*|*tms390z5[[05]]*) ax_gcc_arch="supersparc v8" ;;
154 *hypersparc*|*rt62[[056]]*) ax_gcc_arch="hypersparc v8" ;;
155 *cypress*) ax_gcc_arch=cypress ;;
156 esac ;;
157
158 alphaev5) ax_gcc_arch=ev5 ;;
159 alphaev56) ax_gcc_arch=ev56 ;;
160 alphapca56) ax_gcc_arch="pca56 ev56" ;;
161 alphapca57) ax_gcc_arch="pca57 pca56 ev56" ;;
162 alphaev6) ax_gcc_arch=ev6 ;;
163 alphaev67) ax_gcc_arch=ev67 ;;
164 alphaev68) ax_gcc_arch="ev68 ev67" ;;
165 alphaev69) ax_gcc_arch="ev69 ev68 ev67" ;;
166 alphaev7) ax_gcc_arch="ev7 ev69 ev68 ev67" ;;
167 alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;;
168
169 powerpc*)
170 cputype=`((grep cpu /proc/cpuinfo | head -n 1 | cut -d: -f2 | cut -d, -f1 | sed 's/ //g') ; /usr/bin/machine ; /bin/machine; grep CPU /var/run/dmesg.boot | head -n 1 | cut -d" " -f2) 2> /dev/null`
171 cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'`
172 case $cputype in
173 *750*) ax_gcc_arch="750 G3" ;;
174 *740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;;
175 *74[[4-5]][[0-9]]*) ax_gcc_arch="$cputype 7450 G4" ;;
176 *74[[0-9]][[0-9]]*) ax_gcc_arch="$cputype G4" ;;
177 *970*) ax_gcc_arch="970 G5 power4";;
178 *POWER4*|*power4*|*gq*) ax_gcc_arch="power4 970";;
179 *POWER5*|*power5*|*gr*|*gs*) ax_gcc_arch="power5 power4 970";;
180 603ev|8240) ax_gcc_arch="$cputype 603e 603";;
181 *) ax_gcc_arch=$cputype ;;
182 esac
183 ax_gcc_arch="$ax_gcc_arch powerpc"
184 ;;
185 esac
186 fi # not cross-compiling
187 fi # guess arch
188
189 if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
190 for arch in $ax_gcc_arch; do
191 if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
192 flags="-mtune=$arch"
193 # -mcpu=$arch and m$arch generate nonportable code on every arch except
194 # x86. And some other arches (e.g. Alpha) don't accept -mtune. Grrr.
195 case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
196 else
197 flags="-march=$arch -mcpu=$arch -m$arch"
198 fi
199 for flag in $flags; do
200 AX_CHECK_COMPILER_FLAGS($flag, [ax_cv_gcc_archflag=$flag; break])
201 done
202 test "x$ax_cv_gcc_archflag" = xunknown || break
203 done
204 fi
205
206 fi # $GCC=yes
207 ])
208 AC_MSG_CHECKING([for gcc architecture flag])
209 AC_MSG_RESULT($ax_cv_gcc_archflag)
210 if test "x$ax_cv_gcc_archflag" = xunknown; then
211 m4_default([$3],:)
212 else
213 m4_default([$2], [CFLAGS="$CFLAGS $ax_cv_gcc_archflag"])
214 fi
215 ])