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/usr/bin/cernlib is in cernlib-base-dev 20061220+dfsg3-4.3ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash

# This script is a completely rewritten version of the cernlib script supplied
# with the original CERNLIB source.  It now does recursive library dependency
# checking, removes duplicate entries, and makes breakfast. (Well, not really.)
# This script is provided under the GNU General Public License.

# I have tried to maintain cross-platform compatibility, but I don't have
# any other architectures handy to test things on, so it might have broken.
# But this is not a big deal, since it's doubtful that someone would use
# Debian packages on HP-UX, Solaris, etc. anyway.

# Author: Kevin McCarty, 2002/06/12
# Last revision 2007/01/08

print_help() {
	cat <<- EOF
	Usage: cernlib [OPTIONS] LIBRARIES
	List the linker options required to compile a CERNLIB program with the given
	library dependencies.  Example: "cernlib -G Motif pawlib" on Linux outputs
	"-Wl,-static -lpawlib-lesstif -lpawlib -lmathlib -lgraflib -lpacklib-lesstif
	 -lgrafX11 -lpacklib -lkernlib -Wl,-dy -L/usr/X11R6/lib -lXbae -lXm -lXaw
	 -llapack -lm -lXt -lX11 -lnsl -lcrypt -ldl -lgfortran".
	
	  -a <arch>	Specify an architecture, e.g. Linux (default), AIX, HP-UX, etc.
	  -dy, -safe	Don't assume CERN libraries should be linked against statically.
	  		This flag is also required when using the compiler -static flag.
	  -G <driver>	Specify a graphics driver.  Options: X11, Motif, GPHIGS,
	  		GKS, GL, GPR.  Only the first two are available on Linux.
	  -P, -s	Ignored; for backwards compatibility.
	  -u		Do not include arch-specific libraries in the output.
	  -v <version>	Specify version of \$CERN_LEVEL.  This is meaningless unless
	  		you have installed non-Debian versions of CERNLIB.  In that
	                case you should export \$CERN or \$CERN_ROOT first.
	  -?, --help	Print this help message and exit.
	EOF
}

# Function to determine system name
sysname() {
	local ARCH
	
	[ -d /NextAdmin ] && ARCH="NeXT" || ARCH=`uname -s`
        case $ARCH in
                SunOS)  [ `uname -r | awk '{ print substr($1,1,1) }'` -ge 5 ] \
                                && ARCH="SunSol"
                        ;;
                    *)  ;;
        esac
	echo $ARCH
}

# Function to find system-specific libraries
# Usage: find_sysdeps [ $ARCH ]
find_sysdeps() {
	local ARCH SYSLIBS
	
	[ $# -lt 1 ] && ARCH=`sysname` || ARCH=$1
	[ "$ARCH" = "default" ] && ARCH=`sysname`
	SYSLIBS=""
	
	#     SGI needs -lsun, to see yellow pages 
	#   As of 5.x, the yp version is in libc, so -lsun is no longer needed.
	#     GF. 18-7-96
	#     [ -f /usr/lib/libsun.a -o -f /usr/lib/libsun.so    ] \
	#                                       && SYSLIBS="-lsun"
	[ -f /usr/lib/libulsock.a -o -f /usr/lib/libulsock.so ] \
						&& SYSLIBS="$SYSLIBS -lulsock"
	#     Solaris, many things won't link without -lsocket -lnsl
	if [ "$ARCH" = "SunSol" ] ; then
	        [ -f /usr/lib/libw.so -o -f /usr/lib/libw.a ] \
                                                && SYSLIBS="$SYSLIBS -lw"
	        [ -f /usr/ccs/lib/libgen.so -o -f /usr/ccs/lib/libgen.a ] \
                                                && SYSLIBS="$SYSLIBS -lgen"
	        [ -f /usr/lib/libsocket.so -o -f /usr/lib/libsocket.a ] \
                                                && SYSLIBS="$SYSLIBS -lsocket"
	        [ -f /usr/lib/libnsl.so -o -f /usr/lib/libnsl.a ] \
                                                && SYSLIBS="$SYSLIBS -lnsl"
	        [ -f /usr/lib/libintl.so -o -f /usr/lib/libintl.a ] \
                                                && SYSLIBS="$SYSLIBS -lintl"
		SYSLIBS="$SYSLIBS -ldl"
	fi

	if [ "$ARCH" = "HP-UX" ] ; then
		if   [ -f /usr/lib/libU77.a -o -f /usr/lib/libU77.sl ] ; then
			SYSLIBS="$SYSLIBS -lU77"
		elif [ -f /opt/fortran/lib/libU77.a ] ; then
			SYSLIBS="$SYSLIBS /opt/fortran/lib/libU77.a"
		elif [ -f /opt/fortran/lib/libU77.sl ] ; then
			SYSLIBS="$SYSLIBS /opt/fortran/lib/libU77.sl"
		fi

		SYSLIBS="$SYSLIBS /usr/lib/libdld.sl"
		[ -f /lib/pa1.1/libm.a ] && SYSLIBS="$SYSLIBS /lib/pa1.1/libm.a"
	fi
	
	[ "$ARCH" = "AIX"   ] && SYSLIBS="$SYSLIBS -lld"
	[ "$ARCH" = "Linux" -o "$ARCH" = "GNU/kFreeBSD" ] && SYSLIBS="$SYSLIBS -lnsl -lcrypt -ldl -lgfortran"
	[ "$ARCH" = "Darwin" ] && SYSLIBS="$SYSLIBS -ldl"

	echo $SYSLIBS
}

# Function to find graphics libraries
# Usage: find_grafdeps [ $DRIVER [ $ARCH ] ]
find_grafdeps() {
	local DRIVER ARCH GRAFLIBS
	
	[ $# -lt 1 ] && DRIVER=X11 || DRIVER=$1
	[ $# -lt 2 ] && ARCH=`sysname` || ARCH=$2
	[ "$DRIVER" = "default" ] && DRIVER=X11
	[ "$ARCH" = "default" ] && ARCH=`sysname`
	
	case $ARCH in
		AIX)
			SYSGGL="-lfgl -lgl" ;
			[ -f /usr/lib/libgP.a ] && SYSGGKS="-lgksco -lgP -lX11"
			SYSGMOTIF="-lXm -lXt -lX11 -lPW"
			;;
		ALLIANT)
			SYSGX11="-lX11 -lcurses -lm"
			;;
		HP-UX)
			if [ -d /usr/lib/X11R5 -a -d /usr/lib/Motif1.2 ] ; then
				X11="/usr/lib/X11R5"
				Motif="/usr/lib/Motif1.2"
				SYSGMOTIF="-L$Motif -lXm -L$X11 -lXt -lX11 -lm -lc -lPW"
			else
				X11="/usr/lib/X11R4"
				Motif="/usr/lib/Motif1.1"
				# Xm must appear late, else you get
				# unresolved extrernals
				SYSGMOTIF="-L$Motif -L$X11 -lXm -lXt -lX11 -lm -lc -lPW"
			fi
			SYSGX11="-L$X11 -lX11 -lm"
			;;
		IBMAIX)
			SYSGX11="-lX11 -lm"
			;;
		IRIX)
			SYSGX11="-lX11 -lbsd"
			SYSGGL="-lfgl -lgl_s -lm -lbsd"
			SYSGMOTIF="-lXm -lXt -lX11 -lPW"
			;;
		IRIX64)
			SYSGX11="-lX11 -lbsd"
			SYSGGL="-lfgl -lgl_s -lm -lbsd"
			SYSGMOTIF="-lXm -lXt -lX11 -lPW"
			;;
		Linux)
			SYSGX11=-lX11
			SYSGMOTIF="-lXm -lXt -lX11"
			XDIR=/usr/X11R6/lib
			XDIR64=/usr/X11R6/lib64
			if [ -d $XDIR64 ] ; then
				SYSGX11="-L$XDIR64 $SYSGX11"
				SYSGMOTIF="-L$XDIR64 $SYSGMOTIF"
			fi
			if [ -d $XDIR ] ; then
				SYSGX11="-L$XDIR $SYSGX11"
				SYSGMOTIF="-L$XDIR $SYSGMOTIF"
			fi
			;;
		Darwin)
			SYSGX11=-lX11
			SYSGMOTIF="-lXm -lXt -lXp -lXext -lX11 -lSM -lICE"
			XDIR=/usr/X11R6/lib
			XDIR64=/usr/X11R6/lib64
			if [ -d $XDIR64 ] ; then
				SYSGX11="-L$XDIR64 $SYSGX11"
				SYSGMOTIF="-L$XDIR64 $SYSGMOTIF"
			fi
			if [ -d $XDIR ] ; then
				SYSGX11="-L$XDIR $SYSGX11"
				SYSGMOTIF="-L$XDIR $SYSGMOTIF"
			fi
			;;

		NeXT)
			SYSGX11="/usr/lib/X11/libX11.r"
			SYSGMOTIF="-lXm -lXt /usr/lib/X11/libX11.r"
			;;
		OSF1)
			SYSGX11="-lX11 -ldnet_stub"
			SYSGMOTIF="-lXm -lXt -lX11 -ldnet_stub -lPW -lXmu"
			;;
		SunOS)
			[ -d /usr/motif/lib ] && Motif="-L/usr/motif/lib" \
				|| Motif=" "
			if [ -d /usr/motif12/usr/lib ] ; then
				Motif="-L/usr/motif12/usr/lib"
				# motif12 needs X11R5 from usr/local/lib
				X11="-L/usr/local/lib"
			else
				X11=""
			fi
			SYSGMOTIF="$Motif -lXm $X11 -lXt -lX11"
			[ -f /usr/lib/libgks77.a ] && \
				SYSGGKS="-lgks77 -lgks -lsuntool -lsunwindow -lpixrect -lm"
			;;
		SunSol)
			[ -d /usr/motif/lib ] && Motif="-L/usr/motif/lib" \
				|| Motif=" "
			[ -d /usr/motif12/usr/lib ] && \
				Motif="-L/usr/motif12/usr/lib"
			[ -d /usr/dt/lib ] && \
				Motif="-L/usr/dt/lib -R/usr/dt/lib -Bdynamic"
			[ -d /usr/openwin/lib ] && \
				X11="-L/usr/openwin/lib" || X11=""
			SYSGX11="$X11 -Bdynamic -lX11"
			SYSGMOTIF="$Motif -lXm $X11 -Bdynamic -lXt -lX11"
			[ -f /usr/lib/libgks77.a ] && \
				SYSGGKS="-lgks77 -lgks -lsuntool -lsunwindow -lpixrect -lm"
			;;
		ULTRIX)
			[ -f /usr/lib/libGKS3D.a ] && \
				SYSGGKS="-lGKS3Dforbnd -lGKS3D -lddif -ldwt -lc -lX11 -lcursesX -lm"
			;;
		DomainOS)
			SYSGX11=""
			SYSGMOTIF="-L/usr/lib/X11 -lXm -lXt -lX11 -lm"
			;;
	esac # case `sysname` in
	[ -z "$SYSGX11" ] && SYSGX11="-lX11"

	GRAFLIBS=""
	case $DRIVER in
		GL)	GRAFLIBS="$GRAFLIBS $SYSGGL"  ;;
		GPR)	GRAFLIBS="$GRAFLIBS $SYSGGPR" ;;
		X11)	GRAFLIBS="$GRAFLIBS $SYSGX11" ;;
		Lesstif|Motif)
			[ -z "$SYSGMOTIF" ] && SYSGMOTIF="-lXm -lXt $SYSGX11"
			GRAFLIBS="$GRAFLIBS $SYSGMOTIF"
			;;
		GPHIGS)
			[ -z "$SYSGPHIGS" ] && \
				SYSGPHIGS="_-L$CERN/phigs/$_ver/lib _-lgphigsf2c _-lgphigsc"
			GRAFLIBS="$GRAFLIBS $SYSGPHIGS"
			;;
		GKS)
			[ -z "$SYSGGKS" ] && \
				SYSGGKS="_-L$CERN/gks/$_ver/lib _-lGKS _-lGKSdriv $SYSGX11"
			GRAFLIBS="$GRAFLIBS $SYSGGKS"
			;;
		--)	break ;;
		*)	break ;;
	esac # case $DRIVER in

	echo $GRAFLIBS
}

# Function to find a library
find_library() {
	# $1 = library to find

	# if $2 = "cern", search only in CERNLIB dirs if $CERN exists.
	# This behavior is currently commented out since it causes breakage
	# when compiling Debianized out-of-tree CERNLIB modules. :-(

	local dirlist="/lib /usr/lib /usr/X11R6/lib /lib64 /usr/lib64 /usr/X11R6/lib64 /usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH`"
	if [ ! "$CERN" = "/usr" ] ; then
		#if [ "$2" = cern ] ; then
		#	dirlist="$CERN_ROOT/shlib $CERN_ROOT/lib"
		#else
			dirlist="$dirlist $CERN_ROOT/shlib $CERN_ROOT/lib"
		#fi
	fi
	for ext in so a ; do for dir in $dirlist ; do
		if [ -e "$dir/lib$1.$ext" ] ; then return 0 ; fi
	done ; done
	return 1
}

# Function to calculate library dependencies for given library names
# Usage: depend $DRIVER $ARCH $libs
depend() {
	local DEPS=""
	local d=$1 ; shift
	local a=$1 ; shift

	while [ $# -gt 0 ] ; do
		case $1 in
			# obsolete libnames that no longer exist AFAIK
			bvsl|mpalib)
				DEPS="$DEPS `depend $d $a mathlib`" ;;
			genlib)
				DEPS="$DEPS `depend $d $a phtools`" ;;
			
			# current libraries
			blas)
				if [ "$a" = "Darwin" ] ; then
					DEPS="$DEPS -lcblas -lf77blas -latlas"
				else
					DEPS="$DEPS -l$1"
				fi
				DEPS="$DEPS -lm"
				;;
			cojets|pdflib804|phtools)
				DEPS="$DEPS _-l$1 `depend $d $a mathlib`" ;;
			eurodec|kernlib|photos202)
				DEPS="$DEPS _-l$1 -lm" ;;
			geant321)
				if find_library jetset cern ; then
					DEPS="$DEPS `depend $d $a jetset`"
				fi
				DEPS="$DEPS _-l$1 `depend Motif $a pawlib`" ;;
			herwig59|isajet758)
				DEPS="$DEPS _-l$1 `depend $d $a pdflib`" ;;
			lapack*)
				DEPS="$DEPS -llapack -lm"
				if [ ! "$a" = Linux ] ; then
					DEPS="$DEPS `depend $d $a blas`"
				fi
				;;
			mathlib)
				DEPS="$DEPS _-l$1 `depend $d $a lapack packlib`"
				;;
			packlib)
				if find_library packlib-lesstif cern \
					&& [ "$d" = Motif -o "$d" = Lesstif ]
				then
					DEPS="$DEPS _-lpacklib-lesstif \
					_-lgrafX11 `find_grafdeps Motif $a`"
				elif [ "$d" = X11 ] ; then
					DEPS="$DEPS _-lgrafX11 \
					`find_grafdeps X11 $a`"
				fi
				DEPS="$DEPS _-l$1 `depend $d $a kernlib`" ;;

			# these are not in the Debian distribution of CERNLIB,
			# but may be installed via the Debian packages 
			# ancis and montecarlo-installer-data
			ariadne)
				DEPS="$DEPS _-l$1 `depend $d $a pythia6`" ;;
			ariadne-p5)
				DEPS="$DEPS _-l$1 `depend $d $a lepto`" ;;
			jetset|pythia|fritiof)
				DEPS="$DEPS _-l$1 -lm" ;;
			lepto)
				DEPS="$DEPS _-l$1 `depend $d $a pythia5 \
					mathlib`" ;;
			pythia5)
				DEPS="$DEPS _-l$1 `depend $d $a jetset`" ;;
				
			# graphical libraries

			GKS|gks)
				DEPS="$DEPS `find_grafdeps GKS $a`" ;;
			naglib)
				DEPS="$DEPS _-L$CERN/nag/$_ver/lib _-l$1" ;;
			graflib*)
				local drv="`echo $1 | sed 's,/, ,g' | \
					awk '{ print $2 }'`"
				[ -z "$drv" ] && drv="$d" || d="$drv"
				[ "$drv" = "default" -o "$drv" = "Motif" \
					-o "$drv" = "Lesstif" ] && drv="X11"
				DEPS="$DEPS _-lgraflib _-lgraf$drv \
					`depend $d $a packlib` \
					`find_grafdeps $d $a`"
				;;
			pawlib)
				if find_library pawlib-lesstif cern \
					&& [ "$d" = Motif -o "$d" = Lesstif ] ;
				then
					DEPS="$DEPS _-lpawlib-lesstif -lXbae -lXaw"
				fi
				DEPS="$DEPS _-l$1 \
					`depend $d $a mathlib` \
					`depend $d $a graflib/$d` \
					`find_grafdeps $d $a`"
				;;

			# needed only for compiling libraries
			grafX11)
				DEPS="$DEPS _-l$1 `depend $d $a packlib` \
					`find_grafdeps $d $a`" ;;
			packlib-lesstif)
				DEPS="$DEPS `depend Motif $a packlib` \
					`find_grafdeps Motif $a`"  ;;
			pawlib-lesstif)
				DEPS="$DEPS `depend Motif $a pawlib` \
					`find_grafdeps Motif $a`"  ;;
				
			# aliases
			ar)	 DEPS="$DEPS `depend $d $a ariadne`"    ;;
			arp5)	 DEPS="$DEPS `depend $d $a ariadne-p5`" ;;
			geant)	 DEPS="$DEPS `depend $d $a geant321`"	;;
			herwig)	 DEPS="$DEPS `depend $d $a herwig59`"	;;
			isajet)  DEPS="$DEPS `depend $d $a isajet758`"	;;
			pdflib)  DEPS="$DEPS `depend $d $a pdflib804`"	;;
			photos)  DEPS="$DEPS `depend $d $a photos202`"	;;
			pythia6) DEPS="$DEPS `depend $d $a pythia`"     ;;

			# anything that we don't know what it is and doesn't
			# start with a "-", turn into a library
			*)	 DEPS="$DEPS -l$1"			;;
		esac
		shift
	done

	[ "$d" != default ] && DEPS="$DEPS `find_grafdeps $d $a`"
	echo $DEPS
}

# Function to take a list of strings and prefix "-l" to any of them that
# do not begin with "-"
liblink() {
	local LIST=""
	while [ $# -gt 0 ] ; do
		case $1 in
			-*) LIST="$LIST $1"   ;;
			*)  LIST="$LIST -l$1" ;;
		esac
		shift
	done
	echo $LIST
}


# Function to take a list of strings and remove all but the last occurrence
# of each -l<libname> and all but the first occurrence of each other string
uniquify() {
	local RESULT="" RESULT2="" SEARCHDIRS="" LIBXBAE="" LIBXM="" LIBXAW=""

	# CERN-related linker options have all been prepended with a "_";
	# put them all first and remove the underscore.
	for (( num=1 ; num <= $# ; num++ )) ; do
		case ${!num} in
			_*)	RESULT="$RESULT ${!num#_}" ;;
			-L*)	SEARCHDIRS="$SEARCHDIRS ${!num}" ;;

			# Note: Xbae, Xm and Xaw must appear in the following
			# order: -lXbae -lXm -lXaw, so check for them separately
			-lXbae) LIBXBAE=${!num} ;;
			-lXm)	LIBXM=${!num} ;;
			-lXaw)	LIBXAW=${!num} ;;

			# All other libs or command flags go last
			*)	RESULT2="$RESULT2 ${!num}" ;;
		esac
	done
	LIBXM="$LIBXBAE $LIBXM $LIBXAW"

	if [ -z "$_dynamic" ] ; then
		RESULT="-Wl,-static $RESULT -Wl,-dy $SEARCHDIRS $LIBXM $RESULT2"
	else
		RESULT="$RESULT $SEARCHDIRS $LIBXM $RESULT2"
	fi
	set - $RESULT
	RESULT=""
	
	# decrement and remove duplicate libnames
	for (( num=$# ; num > 0 ; num-- )) ; do
		case ${!num} in
			-l*|-L*)
				[ -z "`echo $RESULT | grep -- ${!num}`" ] && \
					RESULT="${!num} $RESULT" ;;
			*)	RESULT="${!num} $RESULT" ;;
		esac
	done

	set - $RESULT
	RESULT=""

	# increment and remove other duplicate strings
	for (( num=1 ; num <= $# ; num++ )) ; do
                case ${!num} in 
                        -l*)    RESULT="$RESULT ${!num}" ;;
			*)	[ -z "`echo $RESULT | grep -- ${!num}`" ] && \
                                        RESULT="$RESULT ${!num}" ;;
                esac
        done
	
	echo $RESULT
}


[ -z "$CERN" ] && CERN="/usr"
_ver="$CERN_LEVEL"
_u="" ; _arch="`sysname`" ; _driver="default"
_argsdone=false
ARGS=""
COMPFLAGS=""

while [ $# -gt 0 ] ; do
	if [ "$_argsdone" = false ] ; then
		case $1 in
			-a)    _arch="$2" ; shift	;;
			-dy|-safe) _dynamic=true	;;
			-G)    _driver="$2" ; shift 	;;
			-P|-s) shift ; continue		;;
			-u)    _u=1			;;
			-v)    _ver="$2" ; shift	;;
			--)    _argsdone=true ; shift	;;
			--help) print_help ; exit 0	;;
			-*)    print_help ; exit 1	;;
			*)     _argsdone=true		;;
		esac
	fi

	if [ "$_argsdone" = true ] ; then
		case $1 in
			-l*)   ARGS="$ARGS ${1#-l}"	;;
			-*)    COMPFLAGS="$COMPFLAGS $1" ;;
			*)     ARGS="$ARGS $1"		;;
		esac
	fi
	shift
done

if [ -z "$_ver" ]; then 
	_ver="."
fi

if [ -z "$CERN_ROOT" ] ; then
	if [ "$CERN" = "/usr" ] ; then
		CERN_ROOT="/usr" 
	else
		CERN_ROOT="$CERN/$_ver"
	fi
fi

CERNLIB=""
OTHERLIBS=""

for lib in `echo "$ARGS" | sed -e 's/,/ /g'` ; do
	DEPS="`depend $_driver $_arch $lib`"
	if [ -n "$DEPS" ] ; then
		CERNLIB="$CERNLIB $DEPS"
	else
		OTHERLIBS="$OTHERLIBS `liblink $lib`"
	fi
done

LIBDIR=""
if [ "$CERN_ROOT" != "/usr" ] ; then
	[ -d "$CERN_ROOT/shlib" ] && [ -n "$_dynamic" ] && \
		LIBDIR="$LIBDIR -L$CERN_ROOT/shlib"
	[ -d "$CERN_ROOT/lib" ]   && LIBDIR="$LIBDIR -L$CERN_ROOT/lib"
	if [ -z "$LIBDIR" ] ; then
		echo "Can't find CERNLIB libraries in $CERN_ROOT!" 1>&2
		exit 1
	fi
fi
[ -z "$_u" ] && SYSDEPS=`find_sysdeps $_arch` || SYSDEPS=""

echo $COMPFLAGS $LIBDIR `uniquify $CERNLIB $OTHERLIBS $SYSDEPS`
exit 0