Commit fcb3be9f authored by unknown's avatar unknown
Browse files

check-cpu fixes/improvements (Bug #11065) 

    
    - support additional platforms (OpenBSD, Darwin)
    - make use of /proc/cpuinfo CPU flag information
      (needed to distinguish EMT64 Xeons from normal ones)
    - chose the right CPU related options depending on 
      GCC version and target architecture
    - check if the chosen CPU type is actually supported
      by the GCC version , fallback to CPUs predecessor
      until test compile succeeds
parent 9979feb3

BUILD/check-cpu

+126 −42
Original line number Diff line number Diff line
@@ -6,113 +6,197 @@ 
#



if test -r /proc/cpuinfo ; then

  # on Linux (and others?) we can get detailed CPU information out of /proc

  cpuinfo="cat /proc/cpuinfo"



  # detect CPU family

  cpu_family=`$cpuinfo | grep 'family' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`

  if test -z "$cpu_family" ; then

    cpu_family=`$cpuinfo | grep 'cpu' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`

  fi



  # detect CPU vendor and model

  cpu_vendor=`$cpuinfo | grep 'vendor_id' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`

  model_name=`$cpuinfo | grep 'model name' | cut -d ':' -f 2 | head -1`

  if test -z "$model_name" ; then

    model_name=`$cpuinfo | grep 'cpu model' | cut -d ':' -f 2 | head -1`

  fi



  # fallback: get CPU model from uname output

  if test -z "$model_name" ; then

    model_name=`uname -m`

  fi



  # parse CPU flags

  for flag in `$cpuinfo | grep 'flags' | sed -e 's/^flags.*: //'`; do 

	eval cpu_flag_$flag=yes

  done

else

  # Fallback when there is no /proc/cpuinfo

  case "`uname -s`" in

    FreeBSD)

    FreeBSD|OpenBSD)

      cpu_family=`uname -m`;

      model_name=`sysctl -b hw.model`

      model_name=`sysctl -n hw.model`

      ;;

    Darwin)

      cpu_family=`uname -p`

      model_name=`machine`

      ;;

    *)

      cpu_family=`uname -m`;

      model_name="unknown";

      model_name=`uname -p`;

      ;;

  esac

fi



cpu_flag=""

cpu_flag_old=""

# detect CPU shortname as used by gcc options 

# this list is not complete, feel free to add further entries

cpu_arg=""



case "$cpu_family--$model_name" in

  # DEC Alpha

  Alpha*EV6*)

    cpu_flag="ev6";

    cpu_arg="ev6";

    ;;



  # Intel ia32

  *Xeon*)

    cpu_flag="nocona";

    # a Xeon is just another pentium4 ...

    # ... unless it has the "lm" (long-mode) flag set, 

    # in that case it's a Xeon with EM64T support 

	if [ -z "$cpu_flag_lm" ]; then

      cpu_arg="pentium4";

	else

      cpu_arg="nocona";

    fi

    ;;

  *Pentium*4*Mobile*CPU*)

    cpu_flag="pentium4m";

  *Pentium*4*Mobile*)

    cpu_arg="pentium4m";

  ;;

  *Pentium*4*CPU*)

    cpu_flag="pentium4";

  *Pentium*4*)

    cpu_arg="pentium4";

    ;;

  *Pentium*III*Mobile*CPU*)

    cpu_flag="pentium3m";

  *Pentium*III*Mobile*)

    cpu_arg="pentium3m";

  ;;

  *Pentium*III*CPU*)

    cpu_flag="pentium3";

  *Pentium*III*)

    cpu_arg="pentium3";

  ;;

  *Pentium*M*pro*)

    cpu_flag="pentium-m";

    cpu_flag_old="pentium";

    cpu_arg="pentium-m";

  ;;

  *Athlon*64*)

    cpu_flag="athlon64";

    cpu_flag_old="athlon";

    cpu_arg="athlon64";

    ;;

  *Athlon*)

    cpu_flag="athlon";

    cpu_arg="athlon";

    ;;



  # Intel ia64

  *Itanium*)

    # Don't need to set any flags for itanium(at the moment)

    cpu_flag="";

    cpu_arg="";

    ;;

  *ppc)

    cpu_flag="powerpc";

    no_march=1;



  # 

  *powerpc*)

    cpu_arg=`echo $model_name | sed -e"s/ppc//g"`

    ;;



  # unknown

  *)

    cpu_flag="";

    cpu_arg="";

    ;;

esac



if test -z "$cpu_flag"; then



if test -z "$cpu_arg"; then

  echo "BUILD/check-cpu: Oops, could not findout what kind of cpu this machine is using."

  check_cpu_flags=""

  check_cpu_cflags=""

  return

fi



echo "cpu_flag: $cpu_flag"



# different compiler versions have different option names

# for CPU specific command line options

if test -z "$CC" ; then

  cc="gcc";

else

  cc=$CC



fi



cc_ver=`$cc --version | sed 1q`

cc_verno=`echo $cc_ver | sed -e 's/[^0-9. ]//g;	 s/^ *//g; s/ .*//g'`



case "$cc_ver--$cc_verno" in

  *GCC*--3.4*|*GCC*--3.5*|*GCC*--4.*)

    check_cpu_cflags="-mtune=$cpu_flag -march=$cpu_flag"

    ;;

  *GCC*)

    # Fix for older compiler versions

    if test -n "$cpu_flag_old"; then

      cpu_flag="$cpu_flag_old"

    fi

    check_cpu_cflags="-mcpu=$cpu_flag -march=$cpu_flag"

    if test -n "$no_march"; then

      check_cpu_cflags="-mcpu=$cpu_flag"

    fi

      # different gcc backends (and versions) have different CPU flags

      case `gcc -dumpmachine` in

        i?86-*)

   	      case "$cc_verno" in

		    3.4*|3.5*|4.*)

			  check_cpu_args='-mtune=$cpu_arg -march=$cpu_arg'

			  ;;

		    *)

			  check_cpu_args='-mcpu=$cpu_arg -march=$cpu_arg'

			  ;;

          esac

          ;;

        ppc-*)

		  check_cpu_args='-mcpu=$cpu_arg -mtune=$cpu_arg'

          ;;

        *)

          check_cpu_cflags=""

          return

          ;;

      esac

    ;;

  2.95.*)

    # GCC 2.95 doesn't expose its name in --version output

    check_cpu_args='-m$cpu_arg'

    ;;

  *)

    check_cpu_cflags=""

    return

    ;;

esac



# now we check whether the compiler really understands the cpu type

touch __test.c



while [ "$cpu_arg" ] ; do

  echo -n testing $cpu_arg "... "

	

  # compile check

  check_cpu_cflags=`eval echo $check_cpu_args`

  if $cc -c $check_cpu_cflags __test.c 2>/dev/null; then

	  echo ok

      break;

  fi



  echo failed

  check_cpu_cflags=""



  # if compile failed: check whether it supports a predecessor of this CPU

  # this list is not complete, feel free to add further entries

  case "$cpu_arg" in

    # Intel ia32

    nocona)     cpu_arg=pentium4    ;; 

    prescott)   cpu_arg=pentium4    ;;

    pentium4m)  cpu_arg=pentium4    ;;

    pentium4)   cpu_arg=pentium3    ;;

    pentium3m)  cpu_arg=pentium3    ;;

    pentium3)   cpu_arg=pentium2    ;;

    pentium2)   cpu_arg=pentiumpro  ;;

    pentiumpro) cpu_arg=pentium     ;;

    pentium)    cpu_arg=i486        ;;

    i486)       cpu_arg=i386        ;;



	# power / powerPC

	7450)       cpu_arg=7400        ;;



    *)          cpu_arg=""          ;;

  esac

echo $check_cpu_cflags
 
done



rm __test.*