configure

#!/bin/sh
#
#	Copyright (C) 2004-2006 VVD (vvd0@users.sourceforge.net).
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
#	$Id$
#

# C Compiler
CC=gcc
echo CC="${CC}" > Makefile

FILE=conftest


# Byte order determination
echo "Checking byte order..."
cat > "${FILE}.c"  << _EOF
#include <stdio.h>
/*
__LITTLE_ENDIAN__	1234
__BIG_ENDIAN__		4321
__PDP_ENDIAN__		3412
*/
int main()
{
	unsigned a = 0x11223344;
    if (((unsigned char*)&a)[0] == 0x44 &&
		((unsigned char*)&a)[1] == 0x33 &&
		((unsigned char*)&a)[2] == 0x22 &&
		((unsigned char*)&a)[3] == 0x11)
		printf("__LITTLE_ENDIAN__\n");
	else if (
		((unsigned char*)&a)[0] == 0x11 &&
		((unsigned char*)&a)[1] == 0x22 &&
		((unsigned char*)&a)[2] == 0x33 &&
		((unsigned char*)&a)[3] == 0x44)
		printf("__BIG_ENDIAN__\n");
	else if (
		((unsigned char*)&a)[0] == 0x22 &&
		((unsigned char*)&a)[1] == 0x11 &&
		((unsigned char*)&a)[2] == 0x44 &&
		((unsigned char*)&a)[3] == 0x33)
		printf("__PDP_ENDIAN__\n");
	else
		printf("UNKNOWN\n");

	return 0;
}
_EOF

if "${CC}" -o "${FILE}" "${FILE}.c"; then
BYTE_ORDER=`"./${FILE}"`
rm -f "${FILE}" "${FILE}.c"
if test "x${BYTE_ORDER}" != xUNKNOWN; then
	echo "Byte order is: ${BYTE_ORDER}"
	echo "BYTE_ORDER=${BYTE_ORDER}" >> Makefile
else
	rm Makefile
	echo "can't determine"
	echo "Error: can't continue"
	return 1
fi
else
	rm Makefile
	echo "can't determine"
	echo "Error: can't continue"
	return 1
fi

# OS determination

if [ x$1 != x ]; then
	UNAME=$1
else
	UNAME=`uname`
fi

ARCH=`uname -m | sed -e 's/i.86/x86/g' -e 's/Power Macintosh/ppc/g' -e 's/amd64/x86_64/g'`

# on windows, always be 32bit
if [ ${UNAME} = CYGWIN_NT-10.0 ]; then
	BITS=32
	ARCH=x86
fi

echo UNAME="${UNAME}" >> Makefile
echo ARCH="${ARCH}" >> Makefile

# check for second paramater
if [ x$2 = x64 ]; then
	BITS=64
elif [ x$2 = x32 ]; then
	BITS=32
else
	BITS=
fi

# if BITS not set try autodetection...
if [ x${BITS} = x ]; then
	if [ x${ARCH} = xx86_64 ] || [ x${ARCH} = xaarch64 ]; then
		BITS=64
	elif [ x${ARCH} = xarmv7l ]; then
		# arm7 /rasberry pi 3 compilers will fail saying -m32 is unknown flag
		BITS=
	else
		BITS=32
	fi
fi

# put FORCE32BITFLAGS=-m32 in Makefile if required...
if [ x$BITS = x32 ]; then
	echo FORCE32BITFLAGS=-m32 >> Makefile
fi

case ${UNAME} in
FreeBSD | OpenBSD | NetBSD | DragonFly | BSD)
	echo "${UNAME} ${ARCH} ${BITS}bits system - using BSD Makefile."
	echo "SV_OBJS = \$(SV_DIR)/sv_sys_unix.o" >> Makefile
	cat Makefile.BSD >> Makefile
	echo "Configuration completed."
	;;
CYGWIN_NT-10.0)
	echo "${UNAME} ${ARCH} ${BITS}bits system - using GNU Makefile."
	echo "SV_OBJS = \$(SV_DIR)/sv_sys_win.o" >> Makefile
	cat Makefile.GNU >> Makefile
	echo "Configuration completed."
	;;
Darwin | MacOSX | Linux | SunOS | GNU)
	echo "${UNAME} ${ARCH} ${BITS}bits system - using GNU Makefile."
	echo "SV_OBJS = \$(SV_DIR)/sv_sys_unix.o" >> Makefile
	cat Makefile.GNU >> Makefile
	echo "Configuration completed."
	;;
Usage)
	echo "Usage:"
	echo "./configure SYSTEM BITS"
	echo "SYSTEM: used `uname`"
	echo "Possible values are: FreeBSD, OpenBSD, NetBSD, DragonFly, Darwin, MacOSX, Linux, SunOS, BSD, GNU"
	echo "Other systems not supported yet."
	echo "BITS: used ${BITS}"
	echo "Possible values are: 32, 64"
	echo "If you want to force compile 32 bits on 64 bits system use BITS parameter."
	echo ""
        ;;
*)
	echo ""
	echo "Unknown system: ${UNAME}."
	echo ""
	echo "You must specify the system which you want to compile for:"
	echo ""
	echo "./configure FreeBSD               FreeBSD"
	echo "./configure OpenBSD               OpenBSD"
	echo "./configure NetBSD                NetBSD"
	echo "./configure DragonFly             DragonFly BSD"
	echo "./configure Darwin                Darwin/MacOS X"
	echo "./configure MacOSX                Darwin/MacOS X"
	echo "./configure Linux                 Linux"
	echo "./configure SunOS                 SunOS/Solaris"
	echo "or"
	echo "./configure BSD                   for build with BSD Makefile"
	echo "./configure GNU                   for build with GNU Makefile"
	echo "./configure                       for auto configure"
	echo "./configure Usage			for see usage information"
	echo ""
	echo "Other systems not supported yet."
	echo ""
	;;
esac