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#!/bin/sh

# operating system and major, minor version, more should not be necessary

UNAME_SYSTEM=`(uname -s) 2>/dev/null`
UNAME_RELEASE=`(uname -r) 2>/dev/null`
UNAME_VERSION=`(uname -v) 2>/dev/null`
UNAME_MACHINE=`(uname -m) 2>/dev/null`

case "$UNAME_SYSTEM.$UNAME_RELEASE" in
	Linux*)		PLATFORM=LINUX
			OS_MAJOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2`

			if test -f /etc/arch-release; then
				LINUX_DIST='arch'
				LINUX_REV='current'
				if test "$OS_MAJOR_VERSION" = "3"; then
					OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2 | cut -d - -f 1`
				fi
			elif test -f /etc/debian_version; then
				LINUX_DIST='debian'
				LINUX_REV=`cat /etc/debian_version | cut -d . -f 1`
			elif test -f /etc/slackware-version; then
				LINUX_DIST='slackware'
				LINUX_REV=`cat /etc/slackware-version | cut -d ' ' -f 2 | cut -d . -f 1`
			elif test -f /etc/redhat-release; then
				LINUX_DIST='redhat'
				LINUX_REV=`cat /etc/redhat-release | sed s/.*release\ // | sed s/\ .*// | cut -f 1 -d .`
			elif test -f /etc/fedora-release; then
				LINUX_DIST='redhat'
				LINUX_REV=`cat /etc/fedora-release | cut -f 3 -d ' '`
			elif test -f /etc/SuSE-release; then
				grep "SUSE Linux Enterprise Server" /etc/SuSE-release
				if test $? = 0; then
					LINUX_DIST='sles'
					LINUX_REV=`grep VERSION /etc/SuSE-release | cut -f 3 -d ' '`
				else
					LINUX_DIST='suse'
					LINUX_REV=`grep VERSION /etc/SuSE-release | cut -f 3 -d ' '`
				fi
			else
				LINUX_DIST='unknown'
				LINUX_REV='unknown'
			fi
			;;

	FreeBSD*)	PLATFORM=FREEBSD
			OS_MAJOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2 | cut -d - -f 1`
			;;
			
	OpenBSD*)	PLATFORM=OPENBSD
			OS_MAJOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2 | cut -d - -f 1`
			;;

	NetBSD*)	PLATFORM=NETBSD
			OS_MAJOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2 | cut -d - -f 1`
			;;

	SunOS*)		PLATFORM=SUNOS
			OS_MAJOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $UNAME_RELEASE | cut -d . -f 2`
			;;

	CYGWIN_NT*)	PLATFORM=CYGWIN
			_tmp=`echo $UNAME_SYSTEM | cut -d - -f 2`
			OS_MAJOR_VERSION=`echo $_tmp | cut -d . -f 1`
			OS_MINOR_VERSION=`echo $_tmp | cut -d . -f 2`
			;;

	*)
			PLATFORM=UNKNOWN
			echo "Unknown platform '$UNAME_SYSTEM $UNAME_RELEASE'"
			exit 1
esac

# the architecture

case "$UNAME_MACHINE" in
	i*86*)		ARCH=x86
			;;
	x86_64|amd64)	ARCH=x86_64
			;;
	sun4u)		ARCH=sun4u
			;;
	sparc64)	ARCH=sparc64
			;;
	armv6l)		ARCH=armv6l
			;;

	*)		ARCH=UNKNOWN
			echo "Unknown architecture '$UNAME_MACHINE'"
			exit 1
			
esac

# get last line, old 'tail' syntax and POSIX syntax, both exist out there
if test "x${PLATFORM}" = "xSUNOS"; then
	TAIL1='tail -1'
else
	TAIL1='tail -n 1'
fi

# the compiler and version

# do we have ccache or distcc in CC, then check the compiler, not the wrapper
CC=$2
CC=`echo $CC | sed 's/distcc//g' | sed 's/ccache//g'`

# what compiler do we have (we can't relly on it's name as it may be a cc link to the binary!)
(( $CC -v 2>&1 | $TAIL1 ) | grep -i GCC ) 2>/dev/null 1>/dev/null
if test $? = 0; then
	COMPILER='gcc'
else
	( $CC -v | grep tcc ) 2>/dev/null 1>/dev/null
	if test $? = 0; then
		COMPILER='tcc'
	else
#		( $CC -V 2>&1 | grep l_cproc_p ) >/dev/null
		( $CC -V 2>&1 | grep "Intel(R) C" | grep "Compiler" ) >/dev/null
		if test $? = 0; then
			COMPILER='icc'
		else
			( $CC -xhelp=readme 2>&1 | head -n 1 | grep 'Sun Studio' ) >/dev/null
			if test $? = 0; then
				COMPILER='spro'
			else
				( $CC -v 2>&1 | head -n 1 | grep 'pcc' ) >/dev/null
				if test $? = 0; then
					COMPILER='pcc'
				else
					( $CC --version 2>&1 | head -n 1 | grep 'clang' ) >/dev/null
					if test $? = 0; then
						COMPILER='clang'
					else
						COMPILER='unknown'
					fi
				fi
			fi
		fi
	fi
fi

# version of gcc (GNU C compiler)

if test $COMPILER = "gcc"; then
	GCC_VERSION=`gcc -dumpversion`
	GCC_MAJOR_VERSION=`echo $GCC_VERSION | cut -d . -f 1`
	GCC_MINOR_VERSION=`echo $GCC_VERSION | cut -d . -f 2`
fi

# version of tcc (Tiny C compiler)

if test $COMPILER = "tcc"; then
	TCC_VERSION=`tcc -v | cut -d ' ' -f 3`
	TCC_MAJOR_VERSION=`echo $ICC_VERSION | cut -d . -f 1`
	TCC_MINOR_VERSION=`echo $ICC_VERSION | cut -d . -f 2`
fi

# version of icc (Intel C compiler)

if test $COMPILER = "icc"; then
	ICC_VERSION=`icc -dumpversion`
	ICC_MAJOR_VERSION=`echo $ICC_VERSION | cut -d . -f 1`
	ICC_MINOR_VERSION=`echo $ICC_VERSION | cut -d . -f 2`
fi

# version of spro (Sun Pro compiler, Sun Studio)

if test $COMPILER = "spro"; then
	SPRO_VERSION=`$CC -xhelp=readme | head -n 1 | cut -d ' ' -f 3`
	SPRO_MAJOR_VERSION=`echo $SPRO_VERSION | cut -d : -f 1`
fi

# version of pcc (Portable C Compiler)

if test $COMPILER = "pcc"; then
	PCC_VERSION=`$CC -v | head -n 1 | cut -d ' ' -f 2`
	PCC_MAJOR_VERSION=`echo $PCC_VERSION | cut -d . -f 1`
	PCC_MINOR_VERSION=`echo $PCC_VERSION | cut -d . -f 2`
fi

# version of clang (LLVM C frontend)

if test $COMPILER = "clang"; then
	CLANG_VERSION=`$CC --version | head -n 1 | cut -d ' ' -f 3`
	CLANG_MAJOR_VERSION=`echo $CLANG_VERSION | cut -d . -f 1`
	CLANG_MINOR_VERSION=`echo $CLANG_VERSION | cut -d . -f 2`
fi

case "$1" in
	--platform)		echo $PLATFORM
				;;

	--os-major-version)	echo $OS_MAJOR_VERSION
				;;

	--os-minor-version)	echo $OS_MINOR_VERSION
				;;

	--arch)			echo $ARCH
				;;

	--compiler)		echo $COMPILER
				;;

	--gcc-major-version)	echo $GCC_MAJOR_VERSION
				;;

	--gcc-minor-version)	echo $GCC_MINOR_VERSION
				;;

	--tcc-major-version)	echo $TCC_MAJOR_VERSION
				;;

	--tcc-minor-version)	echo $TCC_MINOR_VERSION
				;;

	--icc-major-version)	echo $ICC_MAJOR_VERSION
				;;

	--icc-minor-version)	echo $ICC_MINOR_VERSION
				;;

	--spro-major-version)	echo $SPRO_MAJOR_VERSION
				;;

	--pcc-major-version)	echo $PCC_MAJOR_VERSION
				;;

	--pcc-minor-version)	echo $PCC_MINOR_VERSION
				;;

	--clang-major-version)	echo $CLANG_MAJOR_VERSION
				;;

	--clang-minor-version)	echo $CLANG_MINOR_VERSION
				;;
esac

MAKEFILE_DIR="$3/$4"

# regenerate the cache file, otherwise building is far too slow!
if test ! -f "${MAKEFILE_DIR}/makefiles/gmake/platform.mk.vars"; then
	cat >"${MAKEFILE_DIR}/makefiles/gmake/platform.mk.vars" <<EOF
ARCH=$ARCH
PLATFORM=$PLATFORM
OS_MAJOR_VERSION=$OS_MAJOR_VERSION
OS_MINOR_VERSION=$OS_MINOR_VERSION
COMPILER=$COMPILER
GCC_MAJOR_VERSION=$GCC_MAJOR_VERSION
GCC_MINOR_VERSION=$GCC_MINOR_VERSION
TCC_MAJOR_VERSION=$TCC_MAJOR_VERSION
TCC_MINOR_VERSION=$TCC_MINOR_VERSION
ICC_MAJOR_VERSION=$ICC_MAJOR_VERSION
ICC_MINOR_VERSION=$ICC_MINOR_VERSION
SPRO_MAJOR_VERSION=$SPRO_MAJOR_VERSION
PCC_MAJOR_VERSION=$PCC_MAJOR_VERSION
PCC_MINOR_VERSION=$PCC_MINOR_VERSION
LINUX_DIST=$LINUX_DIST
LINUX_REV=$LINUX_REV
EOF
fi