?RCS: $Id: dlsrc.U,v$
?RCS:
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: dlsrc.U,v $
?RCS:
?X:  hpux support thanks to Jeff Okamoto <okamoto@hpcc101.corp.hp.com>
?X: 
?X:  To create a shared library, you must compile ALL source files in the
?X:  library with +z (or possibly +Z if the library is whopping huge),
?X:  then link the library with -b.  Example:
?X:	  cc -c +z module_a.c
?X:	  cc -c +z module_b.c
?X:	  ld -b module_a.o module_b.o -o module.sl
?X:  
?MAKE:usedl dlsrc cccdlflags lddlflags ccdlflags d_shrplib shrpdir: \
	Getfile Myread test osname sed i_dld d_dlopen Findhdr Setvar \
	cc ldflags cat archlib
?MAKE:	-pick add $@ %<
?S:usedl:
?S:	This variable indicates if the the system supports dynamic
?S:	loading of some sort.  See also dlsrc and dlobj.
?S:.
?S:dlsrc:
?S:	This variable contains the name of the dynamic loading file that
?S:	will be used with the package.
?S:.
?S:cccdlflags:
?S:	This variable contains any special flags that might need to be
?S:	passed with cc -c to compile modules to be used to create a shared
?S:	library that will be used for dynamic loading.  For hpux, this 
?S:	should be +z.  It is up to the makefile to use it.
?S:.
?S:lddlflags:
?S:	This variable contains any special flags that might need to be
?S:	passed to ld to create a shared library suitable for dynamic
?S:	loading.  It is up to the makefile to use it.  For hpux, it
?S:	should be -b.  For sunos 4.1, it is empty.
?S:.
?S:ccdlflags:
?S:	This variable contains any special flags that might need to be
?S:	passed to cc to link with a shared library for dynamic loading. 
?S:	It is up to the makefile to use it.  For sunos 4.1, it should
?S:	be empty.
?S:.
?S:d_shrplib:
?S:	This variable indicates whether libperl should be made as a
?S:	shared library.  This must be true for dynamic loading to
?S:	work on (some) System V Release 4 systems.
?S:.
?S:shrpdir:
?S:	This variable contains the directory where the libperl shared
?S:	library will be installed.  LD_RUN_PATH is set to this when
?S:	linking with libperl (unless it is /usr/lib, the default).
?S:.
?C:USE_DYNAMIC_LOADING ~ %<:
?C:	This symbol, if defined, indicates that dynamic loading of
?C:	some sort is available.
?C:.
?H:?%<:#$usedl USE_DYNAMIC_LOADING		/**/
?H:.
?W:%<:dlopen
?LINT: set d_shrplib shrpdir
?T:dldir
: determine which dynamic loading, if any, to compile in
echo " "
dldir="ext/DynaLoader"
case "$usedl" in
$define|y|true)
	dflt='y'
	usedl="$define"
	;;
$undef|n|false)
	dflt='n'
	usedl="$undef"
	;;
*) 
	dflt='n'
	case "$d_dlopen" in
	    $define) dflt='y' ;;
	esac
	case "$i_dld" in
	    $define) dflt='y' ;;
	esac
	: Does a dl_xxx.xs file exist for this operating system
	$test -f ../$dldir/dl_${osname}.xs && dflt='y'
	;;
esac
rp="Do you wish to use dynamic loading?"
. ./myread
usedl="$ans"
case "$ans" in
y*) usedl="$define"
	case "$dlsrc" in
	'')
		if $test -f ../$dldir/dl_${osname}.xs ; then
			dflt="$dldir/dl_${osname}.xs"
		elif $test "$d_dlopen" = "$define" ; then
			dflt="$dldir/dl_dlopen.xs"
		elif $test "$i_dld" = "$define" ; then
			dflt="$dldir/dl_dld.xs"
		else
			dflt=''
		fi
		;;
	*)	dflt="$dldir/$dlsrc"
		;;
	esac
    echo "The following dynamic loading files are available:"
	: Can not go over to $dldir because getfile has path hard-coded in.
    cd ..; ls -C $dldir/dl*.xs; cd UU
    rp="Source file to use for dynamic loading"
    fn="fne"
    . ./getfile
	usedl="$define"
	: emulate basename
	dlsrc=`echo $ans | $sed -e 's@.*/\([^/]*\)$@\1@'`
    $cat << EOM

Some systems may require passing special flags to $cc -c to
compile modules that will be used to create a shared library.
To use no flags, say "none".

EOM
    case "$cccdlflags" in
    ''|' ') case "$cc" in
		*gcc*)	dflt='-fpic' ;;
		*)  case "$osname" in
			hpux)	dflt='+z' ;;
			next)	dflt='none' ;;
			solaris) dflt='-K pic' ;;
			sunos)	dflt='-pic' ;;
			svr4*|esix*) dflt='-Kpic' ;;
			*)	dflt='none' ;;
		    esac ;;
	    esac ;;
    *) dflt="$cccdlflags" ;;
    esac
    rp="Any special flags to pass to $cc -c to compile shared library modules?"
    . ./myread
    case "$ans" in
    none) cccdlflags='' ;;
    *) cccdlflags="$ans" ;;
    esac

    cat << 'EOM'

Some systems may require passing special flags to ld to create a
library that can be dynamically loaded.  If your ld flags include
-L/other/path options to locate libraries outside your loader's normal
search path, you may need to specify those -L options here as well.  To
use no flags, say "none".

EOM
?X: I have received one report that NeXT requires -r here.
?X: On SunOS 4.1.3, that makes the library no longer shared.
?X: This stuff probably all belongs in hints files anyway.
    case "$lddlflags" in
    ''|' ') case "$osname" in
			hpux)  dflt='-b' ;;
			next)  dflt='none' ;;
			solaris) dflt='-G' ;;
			sunos) dflt='-assert nodefinitions' ;;
			svr4*|esix*) dflt="-G $ldflags" ;;
	        *)     dflt='none' ;;
			esac
			;;
    *) dflt="$lddlflags" ;;
    esac
    rp="Any special flags to pass to ld to create a dynamically loaded library?"
    . ./myread
    case "$ans" in
    none) lddlflags='' ;;
    *) lddlflags="$ans" ;;
    esac

	cat <<EOM

Some systems may require passing special flags to $cc to indicate that
the resulting executable will use dynamic linking.  To use no flags,
say "none".

EOM
    case "$ccdlflags" in
    ''|' ') case "$osname" in
		hpux)	dflt='none' ;;
		next)	dflt='none' ;;
		sunos)	dflt='none' ;;
		*)	dflt='none' ;;
	    esac ;;
    *)  dflt="$ccdlflags" ;;
    esac
    rp="Any special flags to pass to $cc to use dynamic loading?"
    . ./myread
    case "$ans" in
    none) ccdlflags='' ;;
    *) ccdlflags="$ans" ;;
    esac
    ;;
?X: End of usedl=y section
*)  usedl="$undef"
    dlsrc='dl_none.xs'
    lddlflags=''
    ccdlflags=''
    ;;
esac

?X: Currently libperl is only created as a shared library if
?X: using dynamic loading on a SysVR4 system.  Feel free to
?X: add prompts here to allow the user to choose a shared
?X: libperl in other cases.
val="$undef"
case "$osname" in
esix*|svr4*)
    case "$usedl" in
    $define)
	$cat <<EOM

System V Release 4 systems can support dynamic loading
only if libperl is created as a shared library.

EOM
	val="$define"
	;;
    esac ;;
esac
set d_shrplib; eval $setvar
case "$d_shrplib" in
$define)
    cat <<EOM >&4

Be sure to add the perl source directory to the LD_LIBRARY_PATH
environment variable before running make:
    LD_LIBRARY_PATH=`cd ..;pwd`; export LD_LIBRARY_PATH
or
    setenv LD_LIBRARY_PATH `cd ..;pwd`

EOM
;;
esac
case "$d_shrplib" in
$define)
	case "$shrpdir" in
	"")	dflt="$archlib/CORE";;
	*)	dflt="$shrpdir";;
	esac
	rp="What directory should we install the shared libperl into?"
	fn="d~"
	. ./getfile
	shrpdir="$ans"
	;;
*)	shrpdir='none'
	;;
esac