annotate acinclude/ax_gcc_archflag.m4 @ 5284:96a22141cf86 tip

Changed output directory of Universal libSDL.a for iOS to respect build configurations. Template generator was updated to reflect these changes as well.
author Eric Wing <ewing . public |-at-| gmail . com>
date Sat, 12 Feb 2011 21:52:30 -0800
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1 # ===========================================================================
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2 # http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE])
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8 #
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9 # DESCRIPTION
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10 #
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11 # This macro tries to guess the "native" arch corresponding to the target
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12 # architecture for use with gcc's -march=arch or -mtune=arch flags. If
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13 # found, the cache variable $ax_cv_gcc_archflag is set to this flag and
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14 # ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is is set to
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15 # "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is
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16 # to add $ax_cv_gcc_archflag to the end of $CFLAGS.
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17 #
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18 # PORTABLE? should be either [yes] (default) or [no]. In the former case,
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19 # the flag is set to -mtune (or equivalent) so that the architecture is
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20 # only used for tuning, but the instruction set used is still portable. In
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21 # the latter case, the flag is set to -march (or equivalent) so that
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22 # architecture-specific instructions are enabled.
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23 #
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24 # The user can specify --with-gcc-arch=<arch> in order to override the
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25 # macro's choice of architecture, or --without-gcc-arch to disable this.
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26 #
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27 # When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is
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28 # called unless the user specified --with-gcc-arch manually.
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29 #
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30 # Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID
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31 #
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32 # (The main emphasis here is on recent CPUs, on the principle that doing
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33 # high-performance computing on old hardware is uncommon.)
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34 #
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35 # LICENSE
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36 #
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37 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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38 # Copyright (c) 2008 Matteo Frigo
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39 #
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40 # This program is free software: you can redistribute it and/or modify it
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41 # under the terms of the GNU General Public License as published by the
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42 # Free Software Foundation, either version 3 of the License, or (at your
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43 # option) any later version.
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44 #
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45 # This program is distributed in the hope that it will be useful, but
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46 # WITHOUT ANY WARRANTY; without even the implied warranty of
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47 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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48 # Public License for more details.
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49 #
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50 # You should have received a copy of the GNU General Public License along
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51 # with this program. If not, see <http://www.gnu.org/licenses/>.
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52 #
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53 # As a special exception, the respective Autoconf Macro's copyright owner
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54 # gives unlimited permission to copy, distribute and modify the configure
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55 # scripts that are the output of Autoconf when processing the Macro. You
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56 # need not follow the terms of the GNU General Public License when using
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57 # or distributing such scripts, even though portions of the text of the
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58 # Macro appear in them. The GNU General Public License (GPL) does govern
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59 # all other use of the material that constitutes the Autoconf Macro.
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60 #
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61 # This special exception to the GPL applies to versions of the Autoconf
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62 # Macro released by the Autoconf Archive. When you make and distribute a
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63 # modified version of the Autoconf Macro, you may extend this special
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64 # exception to the GPL to apply to your modified version as well.
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65
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66 #serial 8
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67
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68 AC_DEFUN([AX_GCC_ARCHFLAG],
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69 [AC_REQUIRE([AC_PROG_CC])
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70 AC_REQUIRE([AC_CANONICAL_HOST])
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71
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72 AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])],
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73 ax_gcc_arch=$withval, ax_gcc_arch=yes)
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74
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75 AC_MSG_CHECKING([for gcc architecture flag])
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76 AC_MSG_RESULT([])
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77 AC_CACHE_VAL(ax_cv_gcc_archflag,
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78 [
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79 ax_cv_gcc_archflag="unknown"
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80
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81 if test "$GCC" = yes; then
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82
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83 if test "x$ax_gcc_arch" = xyes; then
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84 ax_gcc_arch=""
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85 if test "$cross_compiling" = no; then
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86 case $host_cpu in
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87 i[[3456]]86*|x86_64*) # use cpuid codes, in part from x86info-1.7 by D. Jones
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88 AX_GCC_X86_CPUID(0)
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89 AX_GCC_X86_CPUID(1)
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90 case $ax_cv_gcc_x86_cpuid_0 in
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91 *:756e6547:*:*) # Intel
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92 case $ax_cv_gcc_x86_cpuid_1 in
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93 *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
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94 *5??:*:*:*) ax_gcc_arch=pentium ;;
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95 *6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
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96 *6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
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97 *6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
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98 *6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
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99 *6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
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100 *6??:*:*:*) ax_gcc_arch=pentiumpro ;;
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101 *f3[[347]]:*:*:*|*f4[1347]:*:*:*)
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102 case $host_cpu in
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103 x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
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104 *) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
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105 esac ;;
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106 *f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
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107 esac ;;
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108 *:68747541:*:*) # AMD
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109 case $ax_cv_gcc_x86_cpuid_1 in
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110 *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
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111 *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
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112 *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
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113 *60?:*:*:*) ax_gcc_arch=k7 ;;
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114 *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
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115 *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
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116 *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
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117 *6[[68a]]?:*:*:*)
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118 AX_GCC_X86_CPUID(0x80000006) # L2 cache size
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119 case $ax_cv_gcc_x86_cpuid_0x80000006 in
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120 *:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256
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121 ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
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122 *) ax_gcc_arch="athlon-4 athlon k7" ;;
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123 esac ;;
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124 *f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
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125 *f5?:*:*:*) ax_gcc_arch="opteron k8" ;;
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126 *f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;;
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127 *f??:*:*:*) ax_gcc_arch="k8" ;;
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128 esac ;;
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129 *:746e6543:*:*) # IDT
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130 case $ax_cv_gcc_x86_cpuid_1 in
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131 *54?:*:*:*) ax_gcc_arch=winchip-c6 ;;
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132 *58?:*:*:*) ax_gcc_arch=winchip2 ;;
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133 *6[[78]]?:*:*:*) ax_gcc_arch=c3 ;;
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134 *69?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
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135 esac ;;
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136 esac
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137 if test x"$ax_gcc_arch" = x; then # fallback
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138 case $host_cpu in
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139 i586*) ax_gcc_arch=pentium ;;
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140 i686*) ax_gcc_arch=pentiumpro ;;
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141 esac
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142 fi
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143 ;;
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144
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145 sparc*)
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146 AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/])
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147 cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null`
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148 cputype=`echo "$cputype" | tr -d ' -' |tr $as_cr_LETTERS $as_cr_letters`
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149 case $cputype in
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150 *ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;;
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151 *ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;;
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152 *ultrasparc*) ax_gcc_arch="ultrasparc v9" ;;
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153 *supersparc*|*tms390z5[[05]]*) ax_gcc_arch="supersparc v8" ;;
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154 *hypersparc*|*rt62[[056]]*) ax_gcc_arch="hypersparc v8" ;;
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155 *cypress*) ax_gcc_arch=cypress ;;
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156 esac ;;
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157
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158 alphaev5) ax_gcc_arch=ev5 ;;
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159 alphaev56) ax_gcc_arch=ev56 ;;
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160 alphapca56) ax_gcc_arch="pca56 ev56" ;;
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161 alphapca57) ax_gcc_arch="pca57 pca56 ev56" ;;
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162 alphaev6) ax_gcc_arch=ev6 ;;
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163 alphaev67) ax_gcc_arch=ev67 ;;
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164 alphaev68) ax_gcc_arch="ev68 ev67" ;;
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165 alphaev69) ax_gcc_arch="ev69 ev68 ev67" ;;
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166 alphaev7) ax_gcc_arch="ev7 ev69 ev68 ev67" ;;
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167 alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;;
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168
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169 powerpc*)
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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`
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171 cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'`
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172 case $cputype in
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173 *750*) ax_gcc_arch="750 G3" ;;
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174 *740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;;
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175 *74[[4-5]][[0-9]]*) ax_gcc_arch="$cputype 7450 G4" ;;
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176 *74[[0-9]][[0-9]]*) ax_gcc_arch="$cputype G4" ;;
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177 *970*) ax_gcc_arch="970 G5 power4";;
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178 *POWER4*|*power4*|*gq*) ax_gcc_arch="power4 970";;
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179 *POWER5*|*power5*|*gr*|*gs*) ax_gcc_arch="power5 power4 970";;
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180 603ev|8240) ax_gcc_arch="$cputype 603e 603";;
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181 *) ax_gcc_arch=$cputype ;;
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182 esac
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183 ax_gcc_arch="$ax_gcc_arch powerpc"
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184 ;;
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185 esac
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186 fi # not cross-compiling
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187 fi # guess arch
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188
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189 if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
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190 for arch in $ax_gcc_arch; do
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191 if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
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192 flags="-mtune=$arch"
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193 # -mcpu=$arch and m$arch generate nonportable code on every arch except
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194 # x86. And some other arches (e.g. Alpha) don't accept -mtune. Grrr.
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195 case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
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196 else
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197 flags="-march=$arch -mcpu=$arch -m$arch"
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198 fi
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199 for flag in $flags; do
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200 AX_CHECK_COMPILER_FLAGS($flag, [ax_cv_gcc_archflag=$flag; break])
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201 done
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202 test "x$ax_cv_gcc_archflag" = xunknown || break
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203 done
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204 fi
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205
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206 fi # $GCC=yes
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207 ])
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208 AC_MSG_CHECKING([for gcc architecture flag])
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209 AC_MSG_RESULT($ax_cv_gcc_archflag)
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210 if test "x$ax_cv_gcc_archflag" = xunknown; then
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211 m4_default([$3],:)
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212 else
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213 m4_default([$2], [CFLAGS="$CFLAGS $ax_cv_gcc_archflag"])
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214 fi
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215 ])