~drizzle-trunk/drizzle/development

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

])])