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# ===========================================================================
#      http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE])
#
# DESCRIPTION
#
#   This macro tries to guess the "native" arch corresponding to the target
#   architecture for use with gcc's -march=arch or -mtune=arch flags. If
#   found, the cache variable $ax_cv_gcc_archflag is set to this flag and
#   ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is set to
#   "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is
#   to add $ax_cv_gcc_archflag to the end of $CFLAGS.
#
#   PORTABLE? should be either [yes] (default) or [no]. In the former case,
#   the flag is set to -mtune (or equivalent) so that the architecture is
#   only used for tuning, but the instruction set used is still portable. In
#   the latter case, the flag is set to -march (or equivalent) so that
#   architecture-specific instructions are enabled.
#
#   The user can specify --with-gcc-arch=<arch> in order to override the
#   macro's choice of architecture, or --without-gcc-arch to disable this.
#
#   When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is
#   called unless the user specified --with-gcc-arch manually.
#
#   Requires macros: AX_CHECK_COMPILE_FLAG, AX_GCC_X86_CPUID
#
#   (The main emphasis here is on recent CPUs, on the principle that doing
#   high-performance computing on old hardware is uncommon.)
#
# LICENSE
#
#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
#   Copyright (c) 2008 Matteo Frigo
#   Copyright (c) 2012 Tsukasa Oi
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 11

AC_DEFUN([AX_GCC_ARCHFLAG],
[AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST])

AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])],
	ax_gcc_arch=$withval, ax_gcc_arch=yes)

AC_MSG_CHECKING([for gcc architecture flag])
AC_MSG_RESULT([])
AC_CACHE_VAL(ax_cv_gcc_archflag,
[
ax_cv_gcc_archflag="unknown"

if test "$GCC" = yes; then

if test "x$ax_gcc_arch" = xyes; then
ax_gcc_arch=""
if test "$cross_compiling" = no; then
case $host_cpu in
  i[[3456]]86*|x86_64*) # use cpuid codes
     AX_GCC_X86_CPUID(0)
     AX_GCC_X86_CPUID(1)
     case $ax_cv_gcc_x86_cpuid_0 in
       *:756e6547:*:*) # Intel
          case $ax_cv_gcc_x86_cpuid_1 in
	    *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
	    *5??:*:*:*) ax_gcc_arch=pentium ;;
	    *0?6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
	    *0?6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
	    *0?6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
	    *0?6[[9de]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
	    *0?6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
	    *0?6f?:*:*:*|*1?66?:*:*:*) ax_gcc_arch="core2 pentium-m pentium3 pentiumpro" ;;
	    *1?6[[7d]]?:*:*:*) ax_gcc_arch="penryn core2 pentium-m pentium3 pentiumpro" ;;
	    *1?6[[aef]]?:*:*:*|*2?6[[5cef]]?:*:*:*) ax_gcc_arch="corei7 core2 pentium-m pentium3 pentiumpro" ;;
	    *1?6c?:*:*:*|*[[23]]?66?:*:*:*) ax_gcc_arch="atom core2 pentium-m pentium3 pentiumpro" ;;
	    *2?6[[ad]]?:*:*:*) ax_gcc_arch="corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
	    *0?6??:*:*:*) ax_gcc_arch=pentiumpro ;;
	    *6??:*:*:*) ax_gcc_arch="core2 pentiumpro" ;;
	    ?000?f3[[347]]:*:*:*|?000?f4[1347]:*:*:*|?000?f6?:*:*:*)
		case $host_cpu in
	          x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
	          *) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
	        esac ;;
	    ?000?f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
          esac ;;
       *:68747541:*:*) # AMD
          case $ax_cv_gcc_x86_cpuid_1 in
	    *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
	    *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
	    *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
	    *60?:*:*:*) ax_gcc_arch=k7 ;;
	    *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
	    *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
	    *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
	    *6[[68a]]?:*:*:*)