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AC_DEFUN([MYSQL_CHECK_CPU],
[AC_CACHE_CHECK([if compiler supports optimizations for current cpu],
mysql_cv_cpu,[
ac_save_CFLAGS="$CFLAGS"
if test -r /proc/cpuinfo ; then
cpuinfo="cat /proc/cpuinfo"
cpu_family=`$cpuinfo | grep 'cpu family' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`
cpu_vendor=`$cpuinfo | grep 'vendor_id' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`
fi
if test "$cpu_vendor" = "AuthenticAMD"; then
if test $cpu_family -ge 6; then
cpu_set="athlon pentiumpro k5 pentium i486 i386";
elif test $cpu_family -eq 5; then
cpu_set="k5 pentium i486 i386";
elif test $cpu_family -eq 4; then
cpu_set="i486 i386"
else
cpu_set="i386"
fi
elif test "$cpu_vendor" = "GenuineIntel"; then
if test $cpu_family -ge 6; then
cpu_set="pentiumpro pentium i486 i386";
elif test $cpu_family -eq 5; then
cpu_set="pentium i486 i386";
elif test $cpu_family -eq 4; then
cpu_set="i486 i386"
else
cpu_set="i386"
fi
fi
for ac_arg in $cpu_set;
do
CFLAGS="$ac_save_CFLAGS -mcpu=$ac_arg -march=$ac_arg -DCPU=$ac_arg"
AC_TRY_COMPILE([],[int i],mysql_cv_cpu=$ac_arg; break;, mysql_cv_cpu="unknown")
done
if test "$mysql_cv_cpu" = "unknown"
then
CFLAGS="$ac_save_CFLAGS"
AC_MSG_RESULT(none)
else
AC_MSG_RESULT($mysql_cv_cpu)
fi
])])
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