#! /bin/sh
# @configure_input@
#---------------------------------------------------------------------------#
# Copyright (C) 1995-1999 The University of Melbourne.
# This file may only be copied under the terms of the GNU General
# Public License - see the file COPYING in the Mercury distribution.
#---------------------------------------------------------------------------#
#
# ML - Mercury Linker.
#
# Invokes GCC with the appropriate options to link in the Mercury library.
#
# Usage: see below.
#
# Environment variables: MERCURY_C_LIB_DIR, MERCURY_DEFAULT_GRADE, ...

FULLARCH=@FULLARCH@
NONSHARED_LIB_DIR=${MERCURY_NONSHARED_LIB_DIR=@NONSHARED_LIB_DIR@}
DEFAULT_LIBDIR=@LIBDIR@/lib
LIBDIR=${MERCURY_C_LIB_DIR=$DEFAULT_LIBDIR}
DEFAULT_GRADE=${MERCURY_DEFAULT_GRADE=@DEFAULT_GRADE@}
# DEMANGLER=${MERCURY_DEMANGLER=@LIBDIR@/bin/@FULLARCH@/mdemangle}
DEMANGLER=${MERCURY_DEMANGLER=mdemangle}
CC=${MERCURY_C_COMPILER="@CC@"}
MKFIFO=${MERCURY_MKFIFO="@MKFIFO@"}
ERROR_UNDEFINED="@ERROR_UNDEFINED@"
ALLOW_UNDEFINED="@ALLOW_UNDEFINED@"
EXE_RPATH_OPT=${MERCURY_EXE_RPATH_OPT="@EXE_RPATH_OPT@"}
EXE_RPATH_SEP=${MERCURY_EXE_RPATH_SEP="@EXE_RPATH_SEP@"}
EXT_FOR_SHARED_LIB=${MERCURY_EXT_FOR_SHARED_LIB="@EXT_FOR_SHARED_LIB@"}
LINK_SHARED_OBJ=${MERCURY_LINK_SHARED_OBJ="@LINK_SHARED_OBJ_SH@"}
SHLIB_RPATH_OPT=${MERCURY_SHLIB_RPATH_OPT="@SHLIB_RPATH_OPT@"}
SHLIB_RPATH_SEP=${MERCURY_SHLIB_RPATH_SEP="@SHLIB_RPATH_SEP@"}
SHARED_LIBS=${MERCURY_SHARED_LIBS="@SHARED_LIBS@"}
TMPDIR=${TMPDIR=/tmp}

# On some systems (Solaris for exemple), we need libraries to be able to 
# use sockets. The name of the needed libraries is determined by autoconf
# and passed through this variable.
SOCKET_LIBRARY="@SOCKET_LIBRARY@"
NSL_LIBRARY="@NSL_LIBRARY@"

# Likewise for -ldl (libdl.so), which is often needed for dlopen() etc.
DL_LIBRARY="@DL_LIBRARY@"

# Likewise for -lreadline -l{termcap,curses,ncurses}
READLINE_LIBRARIES="@READLINE_LIBRARIES@"

# If you change these, you will also need to change Mmake.common.in,
# scripts/c2init.in, tools/bootcheck, tools/binary, tools/binary_step
# and tools/linear.
RT_LIB_NAME=mer_rt
STD_LIB_NAME=mer_std
TRACE_LIB_NAME=mer_trace
BROWSER_LIB_NAME=mer_browser

verbose=false
allow_undefined=false
trace=false
readline=true
case $FULLARCH in
	*-win95|*-winnt|*-win32|*-cygwin32|*-cygwin)
		# `gcc -s' is broken in gnu-win32
		strip=false
		;;
	*)
		strip=true
		;;
esac
mercury_libs=default
all_libs=default
demangle=true
MAYBE_STATIC_OPT=""
make_shared_lib=false
leave_shlib_dirs_relative=false
user_shlib_dirs=""

# include the file `init_grade_options.sh-subr'
@INIT_GRADE_OPTIONS@

Help="\
Name: ml - Mercury Linker
Usage: ml [<ml options>] [-- <gcc options>] files...
Options:
	-h, --help
		Print this help message.

Diagnostics options:
	-v, --verbose
		Echo the gcc command line before executing it.
	--no-demangle
		Don't pipe the output of the linker through the Mercury
		demangler.
	--allow-undef
	--allow-undefined
		Don't report an error if there are unresolved symbols.
		This option is only used if you are building a shared
		library (with \`--make-shared-lib); when building
		executables, unresolved symbols are always errors.
		This option is useful when building shared libraries
		that are not intended to be self-contained.

Dynamic/static linking options:
	--mercury-libs {shared, static, none}
		Specify which version of the standard Mercury libraries to
		link with:
			--mercury-libs shared
				Link with the shared libraries (*.so),
				if possible, otherwise with the static ones.
			--mercury-libs static
				Link with the static libraries (*.a).
			--mercury-libs none
				Don't link in the Mercury standard libraries.
	-shared, --shared
		Similar to \`--mercury-libs shared', but applies to all
		libraries, not just the standard Mercury libraries.
	-static, --static
		Similar to \`--mercury-libs static', but applies to all
		libraries, not just the standard Mercury libraries.
	--make-shared-lib
		Produce a shared library, rather than an executable.

Directory options:
	-L <directory>, --lib-dir <directory>
		Include <directory> in the list of directories that the
		linker will use to search for libraries.
	-R <directory>, --shared-lib-dir <directory>
		Include <directory> in the list of directories that the
		dynamic linker will use to search for shared libraries.
	--leave-shared-lib-dirs-relative
		Don't convert relative shared library directory names
		into absolute paths.
	--no-leave-shared-lib-dirs-relative
		Convert relative shared library directory names into
		absolute paths.  This is the default.

Debugging options:
	-t, --trace
		Link in the Mercury debugging libraries.
		This option is needed if any of the modules being linked
		were compiled with tracing enabled.  However, \`--debug'
		implies \`--trace', so if you're using \`--debug',
		then you don't need to explicitly specify \`--trace'.
		Note that \`--trace' is incompatible with \`--static'
		on some platforms (e.g. sparc-sun-solaris2.6).
	-r-, --no-readline
		Don't link in the GPL'd GNU Readline Library.
	-g, --c-debug, --no-strip
		Do not strip C debugging information.

$grade_usage"

while : ; do
    case "$1" in
	-h|--help|"-?")
		echo "$Help"
		exit 0
		;;
	-v|--verbose)
		verbose=true
		;;
	--demangle)
		demangle=true
		;;
	--no-demangle)
		demangle=false
		;;
	--allow-undef|--allow-undefined)
		allow_undef=true
		;;
	--no-allow-undef|--no-allow-undefined)
		allow_undef=false
		;;
	-t|--trace)
		trace=true
		;;
	-t-|--no-trace)
		trace=false
		;;
	-r|--readline)
		readline=true
		;;
	-r-|--no-readline)
		readline=false
		;;
	-g-|--no-c-debug|--strip)
		strip=true
		;;
	-g|--c-debug|--no-strip)
		strip=false
		;;
	--make-shared-lib)
		make_shared_lib=true
		# on some targets, stripping shared libraries will
		# make them unusable, I think, so don't strip
		strip=false
		;;
	--no-libs)
		progname=`basename $0`
		cat 1>&2 << EOF
$progname: Warning: option \`--no-libs' is deprecated --
$progname:   please use the new option \`--mercury-libs none' instead.
$progname:   Support for \`--no-libs' may be removed in a future release.
EOF
		mercury_libs=none
		;;
	--mercury-libs)
		case "$2" in
			shared|static|none|default)
				mercury_libs="$2"
				shift ;;
			*)
				progname=`basename $0`
				cat 1>&2 << EOF
$progname: Error: parameter to \`--mercury-libs' option should be either
$progname:   \`shared', \`static', \`none', or \`default', not \`$2'.
$progname: Try \`$0 --help' for help.
EOF
				exit 1
				;;
		esac
		;;
	-shared|--shared)
		all_libs=shared
		case $mercury_libs in static|default)
			mercury_libs=shared ;;
		esac
		;;
	-static|--static)
		all_libs=static
		case $mercury_libs in shared|default)
			mercury_libs=static ;;
		esac
		;;
	-L|--lib-dir)
		dir="$2"
		user_libdir_opts="$user_libdir_opts -L$dir"
		shift
		;;
	-L*)
		user_libdir_opts="$user_libdir_opts $1"
		;;
	--leave-shared-lib-dirs-relative)
		leave_shlib_dirs_relative=true
		;;
	--no-leave-shared-lib-dirs-relative)
		leave_shlib_dirs_relative=false
		;;
	-R|--shared-lib-dir)
		dir="$2"
		case $leave_shlib_dirs_relative in false)
			case "$dir" in
				/*) ;;
				*)  dir="`pwd`/$dir" ;;
			esac
			;;
		esac
		user_shlib_dirs="$user_shlib_dirs $dir"
		shift
		;;
	-R*)
		dir="` expr $1 : '-R\(.*\)' `"
		case $leave_shlib_dirs_relative in false)
			case "$dir" in
				/*) ;;
				*)  dir="`pwd`/$dir" ;;
			esac
			;;
		esac
		user_shlib_dirs="$user_shlib_dirs $dir"
		;;

	# include the file `parse_grade_options.sh-subr'
	@PARSE_GRADE_OPTIONS@

	--)
		shift
		break ;;
	*)
		break ;;
    esac
    shift
done

# include the file `final_grade_options.sh-subr'
@FINAL_GRADE_OPTIONS@

# --require-tracing (which is implied by --debug) implies --trace
case $require_tracing in
	true)	trace=true ;;
	false)	;;
esac

# If you haven't set mercury_libs, set it to the default value
# (shared on most systems). Note that if you have set all_libs,
# it will also have set mercury_libs.
case $mercury_libs in default)
	mercury_libs=shared
	case $FULLARCH in i?86-*-linux*|i?86-*-freebsd*)
		# shared libraries are not the default on Linux
		# -- see README.Linux
		# Likewise for FreeBSD
		case $make_shared_lib in false)
			mercury_libs=static
			;;
		esac
		;;
	esac
	;;
esac

# If you haven't set all_libs, set it to the default value
# (shared on most systems).
case $all_libs in default)
	all_libs=shared
	case $FULLARCH in i?86-*-linux*|i?86-*-freebsd*)
		# shared libraries are not the default on Linux
		# -- see README.Linux
		# Likewise for FreeBSD
		case $make_shared_lib in false)
			all_libs=static
			;;
		esac
		;;
	esac
	;;
esac

# Defaults have been set, now set options.

case $all_libs in static)
	case $FULLARCH in
		*-linux*)
			# On Linux, if we're linking statically, we need to
			# pass `-defsym _DYNAMIC=0' to the linker, to avoid
			# undefined references to _DYNAMIC in
			# boehm_gc/dyn_load.c.
			# (We might eventually need similar treatment
			# for other OSs too)
			MAYBE_STATIC_OPT="-static -Wl-defsym -Wl_DYNAMIC=0"
			;;
		*)
			MAYBE_STATIC_OPT=-static
			;;
	esac
esac

#
# compute the grade from the options settings
#

case $non_local_gotos,$global_regs in
	true,true) 	GRADE="fast" ;;
	true,false)  	GRADE="jump" ;;
	false,true)  	GRADE="reg" ;;
	false,false)   	GRADE="none" ;;
esac
case $asm_labels in
	true)		GRADE="asm_$GRADE" ;;
	false)		;;
esac
case $thread_safe in
	true)	GRADE="$GRADE.par" ;;
	false)	;;
esac
case $gc_method in
	conservative)	GRADE="$GRADE.gc" ;;
	accurate)	GRADE="$GRADE.agc" ;;
esac
case $profile_time,$profile_calls,$profile_memory in
	true,true,false)	GRADE="$GRADE.prof" ;;
	true,false,false)	GRADE="$GRADE.proftime" ;;
	false,true,false)	GRADE="$GRADE.profcalls" ;;
	true,true,true)		GRADE="$GRADE.profall" ;;
	false,true,true)	GRADE="$GRADE.memprof" ;;
	false,false,false)	;;
	*)			progname=`basename $0`
				echo \
	"$progname: Error: invalid combination of profiling options." 1>&2
				exit 1
			;;
esac
case $use_trail in
	true)		GRADE="$GRADE.tr" ;;
	false)		;;
esac
case $use_minimal_model in
	true)	GRADE="$GRADE.mm" ;;
	false)	;;
esac
# We ignore the value of $picreg in computing the name of the grade
# that we will use as a directory name below.
# case $picreg in
# 	true)	GRADE="$GRADE.picreg" ;;
# 	false)	;;
# esac
case $stack_trace,$require_tracing in
	true,true)	GRADE="$GRADE.debug" ;;
	false,true)	GRADE="$GRADE.trace" ;;
	true,false)	GRADE="$GRADE.strce" ;;
	false,false)	;;
esac

case "$GRADE" in
	*.gc.prof*)
		LIBGC="-lgc_prof"
		LIBGC_STATIC="$LIBDIR/$FULLARCH/libgc_prof.a"
		;;
	*.gc*)
		LIBGC="-lgc"
		LIBGC_STATIC="$LIBDIR/$FULLARCH/libgc.a"
		;;
	*)
		LIBGC=
		LIBGC_STATIC=
		;;
esac

case $readline in
	true)	;;
	false)	READLINE_LIBRARIES=
		;;
esac

case $trace in
	true)	TRACE_LIBS="-l$TRACE_LIB_NAME -l$BROWSER_LIB_NAME"
		TRACE_LIBS_SYSTEM="$SOCKET_LIBRARY $NSL_LIBRARY $DL_LIBRARY \
			$READLINE_LIBRARIES"
		TRACE_STATIC_LIBS="\
			$LIBDIR/$GRADE/$FULLARCH/lib$TRACE_LIB_NAME.a \
			$LIBDIR/$GRADE/$FULLARCH/lib$BROWSER_LIB_NAME.a"
		;;
	false)	TRACE_LIBS=
		TRACE_LIBS_SYSTEM=
		TRACE_STATIC_LIBS=
		;;
esac
		
case $strip in
	true)	STRIP_OPTS="-s" ;;
	false)  STRIP_OPTS="" ;;
esac

case $thread_safe in
	true)
		case "$FULLARCH" in
		*-osf*)		THREAD_LIBS="-lpthreads -lc_r" ;;
		*-linux*)	THREAD_LIBS="-lpthread" ;;
		*-solaris*)	THREAD_LIBS="-lpthread -ldl" ;;
		*)		echo "$0: warning: don't know which" \
					"library to use for pthreads" 1>&2
				THREAD_LIBS=""
				;;
		esac ;;
	false)	THREAD_LIBS="" ;;
esac

case $make_shared_lib in
    true)
	LINKER="$LINK_SHARED_OBJ"
	case $allow_undef in
	    true)  UNDEF_OPT="$ALLOW_UNDEFINED" ;;
	    false) UNDEF_OPT="$ERROR_UNDEFINED" ;;
	esac
	RPATH_OPT="$SHLIB_RPATH_OPT"
	RPATH_SEP="$SHLIB_RPATH_SEP"
	STDLIBS="$SHARED_LIBS $THREAD_LIBS"
	;;
    false)
	LINKER="$CC"
	UNDEF_OPT=""
	RPATH_OPT="$EXE_RPATH_OPT"
	RPATH_SEP="$EXE_RPATH_SEP"
	STDLIBS="-lm $THREAD_LIBS"
	;;
esac

merc_libdir_opts="\
	-L$LIBDIR/$GRADE/$FULLARCH
	-L$LIBDIR/$FULLARCH
	-L/usr/local/lib
"
LIBDIR_OPTS="$user_libdir_opts $merc_libdir_opts"

case $mercury_libs in
	shared)
		MERCURY_LIBS=${MERCURY_LIBS="$TRACE_LIBS -l$STD_LIB_NAME -l$RT_LIB_NAME $LIBGC"}
		LIBS=${LIBS="$MERCURY_LIBS $TRACE_LIBS_SYSTEM $STDLIBS"}
		merc_shlib_dirs="$merc_shlib_dirs $LIBDIR/$GRADE/$FULLARCH"
		merc_shlib_dirs="$merc_shlib_dirs $LIBDIR/$FULLARCH"
		;;
	static)
		MERCURY_LIBS=${MERCURY_LIBS="$TRACE_STATIC_LIBS
			$LIBDIR/$GRADE/$FULLARCH/lib$STD_LIB_NAME.a \
			$LIBDIR/$GRADE/$FULLARCH/lib$RT_LIB_NAME.a \
			$LIBGC_STATIC"}
		LIBS=${LIBS="$MERCURY_LIBS $TRACE_LIBS_SYSTEM $STDLIBS"}
		merc_shlib_dirs=""
		;;
	none)	LIBS="$TRACE_LIBS_SYSTEM $STDLIBS"
		LIBDIR_OPTS="$user_libdir_opts"
		merc_shlib_dirs=""
		;;
esac


RPATH_OPT_LIST=
# only set RPATH_OPT_LIST if the system supports shared libraries
case $EXT_FOR_SHARED_LIB in so)
	prev=""
	for dir in $user_shlib_dirs $merc_shlib_dirs 'kludge for broken shells'
	do
	    case "$dir" in
		'kludge for broken shells')
		    ;;
		*)
		    case "$prev" in
			"") RPATH_OPT_LIST="$RPATH_OPT$dir" ;;
			*)  RPATH_OPT_LIST="$RPATH_OPT_LIST$RPATH_SEP$dir" ;;
		    esac
		    ;;
	    esac
	    prev=$dir
	done
	;;
esac

case $FULLARCH in
    #
    # On Irix 5, grades `fast' and `jump' only work in non_shared mode.
    #
    *-sgi-irix5*)
	case $non_local_gotos in
	    true)
		ARCH_OPTS=-non_shared
		NONSHARED_PATH="$NONSHARED_LIB_DIR:/usr/lib/nonshared"
		LIBRARY_PATH="$NONSHARED_PATH:$LIBRARY_PATH"
		export LIBRARY_PATH
		;;
	esac
	;;
    #
    # On Linux ELF, `-rdynamic' is needed to make symbols
    # exported for use in code linked in with dlopen(),
    # which is used for interactive queries in the
    # Mercury debugger.
    #
    *-linux*aout*)
	# Linux a.out -- no special options needed
	;;
    *-linux*)
	# Linux ELF -- need to add `-rdynamic' if using the debugger
	case $trace in true)
		ARCH_OPTS=-rdynamic
	esac
	;;
esac

case "$MKFIFO" in
    none) demangle=false ;;
esac

case $verbose in
    true)
	echo "ml: using grade \`$GRADE'"
	case $demangle in
	    false)
		echo $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT \
			$ARCH_OPTS $LIBDIR_OPTS $RPATH_OPT_LIST "$@" $LIBS
		;;
	    true)
		echo $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT \
			$ARCH_OPTS $LIBDIR_OPTS $RPATH_OPT_LIST "$@" $LIBS "|"
		echo "$DEMANGLER"
		;;
	esac
	;;
esac

case $demangle in
    true)
	# we would like to just run $CC and pipe the result into $DEMANGLER,
	# but `$CC | $DEMANGLER' would return the wrong exit status, so
	# we need to use a named pipe; if the system doesn't have named
	# pipes, then we don't use the demangler

		# create the pipe, making sure we remove it if interrupted
	old_umask=`umask`
	umask 022
	try=0
	until 
		ML_TMPDIR=$TMPDIR/ml$$
		PIPE=$ML_TMPDIR/pipe
		trap 'rmdir $ML_TMPDIR >/dev/null 2>&1; exit 1' 1 2 3 13 15 
		mkdir $ML_TMPDIR
	do
		try="`expr $try + 1`"
		# give up after 20 tries
		case "$try" in 20)
			echo "ml: unable to create temporary directory" \
				"for pipe" 1>&2
			exit 1
		esac
	done
	trap 'rm -rf $ML_TMPDIR; exit 1' 1 2 3 13 15 
	umask $old_umask
	$MKFIFO $PIPE
		# execute the demangler in the background, with stdin 
		# coming from the pipe and with stdout redirected to stderr
	exec $DEMANGLER --explain-link-errors 1>&2 < $PIPE &
		# execute $CC with stdout & stderr redirected to
		# go via the pipe to $DEMANGLER and then to stderr
	case $# in
		0) $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT $ARCH_OPTS \
			$LIBDIR_OPTS $RPATH_OPT_LIST $LIBS >$PIPE 2>&1 ;;

		*) $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT $ARCH_OPTS \
			$LIBDIR_OPTS $RPATH_OPT_LIST "$@" $LIBS >$PIPE 2>&1 ;;
	esac
	linker_status=$?
		# now we can remove the pipe; since is an open file, it will
		# stay around until $DEMANGLER exits
	rm -rf $ML_TMPDIR
		# wait for the demangler to exit before exiting ourselves
	wait
	exit $linker_status
	;;
false)
	case $# in
		0) exec $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT $ARCH_OPTS \
			$LIBDIR_OPTS $RPATH_OPT_LIST $LIBS ;;
		*) exec $LINKER $UNDEF_OPT $STRIP_OPTS $MAYBE_STATIC_OPT $ARCH_OPTS \
			$LIBDIR_OPTS $RPATH_OPT_LIST "$@" $LIBS ;;
	esac
	;;
esac