acinclude/ax_gcc_archflag.m4
author Sam Lantinga <slouken@libsdl.org>
Mon, 16 Oct 2017 15:22:40 -0700
changeset 11629 ec9b9e71f51b
parent 5029 5d7d48157be7
permissions -rw-r--r--
Fixed compiler warning on iOS
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# ===========================================================================
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#      http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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#   AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE])
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#
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# DESCRIPTION
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#
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#   This macro tries to guess the "native" arch corresponding to the target
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#   architecture for use with gcc's -march=arch or -mtune=arch flags. If
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#   found, the cache variable $ax_cv_gcc_archflag is set to this flag and
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#   ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is is set to
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#   "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is
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#   to add $ax_cv_gcc_archflag to the end of $CFLAGS.
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#
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#   PORTABLE? should be either [yes] (default) or [no]. In the former case,
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#   the flag is set to -mtune (or equivalent) so that the architecture is
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#   only used for tuning, but the instruction set used is still portable. In
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#   the latter case, the flag is set to -march (or equivalent) so that
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#   architecture-specific instructions are enabled.
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#
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#   The user can specify --with-gcc-arch=<arch> in order to override the
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#   macro's choice of architecture, or --without-gcc-arch to disable this.
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#
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#   When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is
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#   called unless the user specified --with-gcc-arch manually.
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#
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#   Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID
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#
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#   (The main emphasis here is on recent CPUs, on the principle that doing
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#   high-performance computing on old hardware is uncommon.)
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#
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# LICENSE
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#
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#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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#   Copyright (c) 2008 Matteo Frigo
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#
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#   This program is free software: you can redistribute it and/or modify it
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#   under the terms of the GNU General Public License as published by the
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#   Free Software Foundation, either version 3 of the License, or (at your
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#   option) any later version.
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#
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#   This program is distributed in the hope that it will be useful, but
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#   WITHOUT ANY WARRANTY; without even the implied warranty of
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#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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#   Public License for more details.
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#
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#   You should have received a copy of the GNU General Public License along
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#   with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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#   As a special exception, the respective Autoconf Macro's copyright owner
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#   gives unlimited permission to copy, distribute and modify the configure
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#   scripts that are the output of Autoconf when processing the Macro. You
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#   need not follow the terms of the GNU General Public License when using
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#   or distributing such scripts, even though portions of the text of the
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#   Macro appear in them. The GNU General Public License (GPL) does govern
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#   all other use of the material that constitutes the Autoconf Macro.
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#
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#   This special exception to the GPL applies to versions of the Autoconf
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#   Macro released by the Autoconf Archive. When you make and distribute a
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#   modified version of the Autoconf Macro, you may extend this special
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#   exception to the GPL to apply to your modified version as well.
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#serial 8
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AC_DEFUN([AX_GCC_ARCHFLAG],
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST])
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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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	ax_gcc_arch=$withval, ax_gcc_arch=yes)
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AC_MSG_CHECKING([for gcc architecture flag])
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AC_MSG_RESULT([])
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AC_CACHE_VAL(ax_cv_gcc_archflag,
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[
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ax_cv_gcc_archflag="unknown"
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if test "$GCC" = yes; then
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if test "x$ax_gcc_arch" = xyes; then
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ax_gcc_arch=""
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if test "$cross_compiling" = no; then
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case $host_cpu in
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  i[[3456]]86*|x86_64*) # use cpuid codes, in part from x86info-1.7 by D. Jones
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     AX_GCC_X86_CPUID(0)
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     AX_GCC_X86_CPUID(1)
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     case $ax_cv_gcc_x86_cpuid_0 in
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       *:756e6547:*:*) # Intel
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          case $ax_cv_gcc_x86_cpuid_1 in
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	    *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
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	    *5??:*:*:*) ax_gcc_arch=pentium ;;
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	    *6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
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	    *6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
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	    *6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
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	    *6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
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	    *6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
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	    *6??:*:*:*) ax_gcc_arch=pentiumpro ;;
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            *f3[[347]]:*:*:*|*f4[1347]:*:*:*)
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		case $host_cpu in
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                  x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
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                  *) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
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                esac ;;
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            *f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
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          esac ;;
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       *:68747541:*:*) # AMD
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          case $ax_cv_gcc_x86_cpuid_1 in
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	    *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
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	    *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
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	    *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
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	    *60?:*:*:*) ax_gcc_arch=k7 ;;
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	    *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
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	    *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
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	    *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
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	    *6[[68a]]?:*:*:*)
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	       AX_GCC_X86_CPUID(0x80000006) # L2 cache size
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	       case $ax_cv_gcc_x86_cpuid_0x80000006 in
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                 *:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256
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			ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
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                 *) ax_gcc_arch="athlon-4 athlon k7" ;;
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	       esac ;;
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	    *f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
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	    *f5?:*:*:*) ax_gcc_arch="opteron k8" ;;
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	    *f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;;
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	    *f??:*:*:*) ax_gcc_arch="k8" ;;
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          esac ;;
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	*:746e6543:*:*) # IDT
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	   case $ax_cv_gcc_x86_cpuid_1 in
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	     *54?:*:*:*) ax_gcc_arch=winchip-c6 ;;
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	     *58?:*:*:*) ax_gcc_arch=winchip2 ;;
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	     *6[[78]]?:*:*:*) ax_gcc_arch=c3 ;;
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	     *69?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
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	   esac ;;
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     esac
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     if test x"$ax_gcc_arch" = x; then # fallback
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	case $host_cpu in
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	  i586*) ax_gcc_arch=pentium ;;
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	  i686*) ax_gcc_arch=pentiumpro ;;
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        esac
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     fi
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     ;;
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  sparc*)
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     AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/])
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     cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null`
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     cputype=`echo "$cputype" | tr -d ' -' |tr $as_cr_LETTERS $as_cr_letters`
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     case $cputype in
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         *ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;;
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         *ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;;
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         *ultrasparc*) ax_gcc_arch="ultrasparc v9" ;;
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         *supersparc*|*tms390z5[[05]]*) ax_gcc_arch="supersparc v8" ;;
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         *hypersparc*|*rt62[[056]]*) ax_gcc_arch="hypersparc v8" ;;
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         *cypress*) ax_gcc_arch=cypress ;;
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     esac ;;
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  alphaev5) ax_gcc_arch=ev5 ;;
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  alphaev56) ax_gcc_arch=ev56 ;;
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  alphapca56) ax_gcc_arch="pca56 ev56" ;;
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  alphapca57) ax_gcc_arch="pca57 pca56 ev56" ;;
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  alphaev6) ax_gcc_arch=ev6 ;;
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  alphaev67) ax_gcc_arch=ev67 ;;
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  alphaev68) ax_gcc_arch="ev68 ev67" ;;
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  alphaev69) ax_gcc_arch="ev69 ev68 ev67" ;;
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  alphaev7) ax_gcc_arch="ev7 ev69 ev68 ev67" ;;
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  alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;;
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  powerpc*)
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     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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     cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'`
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     case $cputype in
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       *750*) ax_gcc_arch="750 G3" ;;
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       *740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;;
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       *74[[4-5]][[0-9]]*) ax_gcc_arch="$cputype 7450 G4" ;;
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       *74[[0-9]][[0-9]]*) ax_gcc_arch="$cputype G4" ;;
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       *970*) ax_gcc_arch="970 G5 power4";;
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       *POWER4*|*power4*|*gq*) ax_gcc_arch="power4 970";;
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       *POWER5*|*power5*|*gr*|*gs*) ax_gcc_arch="power5 power4 970";;
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       603ev|8240) ax_gcc_arch="$cputype 603e 603";;
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       *) ax_gcc_arch=$cputype ;;
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     esac
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     ax_gcc_arch="$ax_gcc_arch powerpc"
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     ;;
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esac
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fi # not cross-compiling
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fi # guess arch
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if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
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for arch in $ax_gcc_arch; do
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  if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
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    flags="-mtune=$arch"
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    # -mcpu=$arch and m$arch generate nonportable code on every arch except
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    # x86.  And some other arches (e.g. Alpha) don't accept -mtune.  Grrr.
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    case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
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  else
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    flags="-march=$arch -mcpu=$arch -m$arch"
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  fi
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  for flag in $flags; do
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    AX_CHECK_COMPILER_FLAGS($flag, [ax_cv_gcc_archflag=$flag; break])
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  done
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  test "x$ax_cv_gcc_archflag" = xunknown || break
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done
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fi
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fi # $GCC=yes
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])
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AC_MSG_CHECKING([for gcc architecture flag])
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AC_MSG_RESULT($ax_cv_gcc_archflag)
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if test "x$ax_cv_gcc_archflag" = xunknown; then
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  m4_default([$3],:)
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else
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  m4_default([$2], [CFLAGS="$CFLAGS $ax_cv_gcc_archflag"])
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fi
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])