guesscpu_linux

#!/bin/sh
# try guessing CPU type and flags suitable for compiler version
# needs a lot of work for many kernel version and architectures

$CC -v 2> .gcc_version

#GCC_VER=` sed -n 's/^.*gcc version //p' .gcc_version`
#GCC_VER=` sed -n 's/^[a-z ]*\([0-9.]*\).*/\1/p' .gcc_version`

GCC_VER=`cat .gcc_version`

#echo "gcc version is $GCC_VER" 1>&2

case $GCC_VER in
	*2.6*) echo "gcc version $GCC_VER - are you sure you don't want to update it?" 1>&2
	      OLDFLAGS="y" ;;
	*2.7*) OLDFLAGS="y" ;;
	*2.8*) ;;
	*2.91.*) echo "GCC_XFLAGS += -DUSE_AREGP">.cpu-extraflags
	      ;;
	*2.9*);;
	*) echo "gcc version $GCC_VER not known - cannot set CPU flags" 1>&2 ;;
esac

ARCH=`uname -m`
CPU=`cat /proc/cpuinfo| sed -n 's/cpu.*: //p'`
[ -z "$CPU" ] && CPU=`cat /proc/cpuinfo| sed -n 's/CPU[[:blank:]]*:[^[:alnum:]]*//p' | cut -f1`
[ -n "$CPU" ] && for i in ${CPU};do CPU=${i};break;done	# for amd k6, etc.; .hpr'18.12.1999 #

#echo "ARCH=\"${ARCH}\"; CPU type from /proc/cpuinfo: \"$CPU\""


if [ "$OLDFLAGS" = "y" ] ; then
  case $ARCH in
	*486|4) DEF_CPU=-m486 ;;
	*586|5) DEF_CPU=-m486 ;;  # gcc<2.8 doesn't know anything else..
	*686|6) DEF_CPU=-m486 ;;
	m68k) DEF_CPU=-m${CPU};;
	*) echo "machine type not known - cannot set CPU flags automatically" 1>&2
	   DEF_CPU=ERROR ;;
  esac
else
  case $ARCH in
	*486|4) DEF_CPU="-march=i486" ;;
	*586|5) DEF_CPU="-march=pentium" ;;
	*686|6) DEF_CPU="-march=pentiumpro" ;;
	m68k) DEF_CPU=-m${CPU};;
	*) echo "machine type not known - cannot set CPU flags automatically" 1>&2
	   DEF_CPU=ERROR ;;
  esac
fi

#rm .gcc_version

echo "$DEF_CPU"