#!/bin/sh
#
# Written: Nov 1994 Wayne Scott <wscott@ichips.intel.com>
#
# Updated: 1997-8 Jarkko Hietaniemi <jhi@iki.fi>
#
# Create the export list for perl.
# Needed by AIX to do dynamic linking.
#
# This simple program relies on global.sym and few other *.sym files
# and the *var*.h files being up to date with all of the global
# symbols that a dynamic link library might want to access.
#
# Most symbols have a Perl_ or PL_prefix because that's what embed.h
# sticks in front of them.
#
# AIX requires the list of external symbols (variables or functions)
# that are made available for another executable object file the import.
# The list is called the export file and it is a simple text file.
# The first line must be
#!
# That is, hash-bang, pound-shout, however you want to call it.
# The remainder of the file are the names of the symbols, one per line.
# The file is then given to the system loader (cc/xlc command line)
# as -bE:export.file.

case $CONFIGDOTSH in
'')
	if test -f config.sh; then TOP=.;
	elif test -f ../config.sh; then TOP=..;
	elif test -f ../../config.sh; then TOP=../..;
	elif test -f ../../../config.sh; then TOP=../../..;
	elif test -f ../../../../config.sh; then TOP=../../../..;
	else
		echo "Can't find config.sh."; exit 1
	fi
	. $TOP/config.sh
	;;
esac
: This forces SH files to create target in same directory as SH file.
: This is so that make depend always knows where to find SH derivatives.
case "$0" in
*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
esac

echo "Extracting perl.exp"

rm -f perl.exp
echo "#!" > perl.exp

# No compat3 since 5.004_50.
# No interp.sym since 5.005_03.
# perlio.sym will added later if needed.

grep '^Perl_' global.sym                               >> perl.exp
grep '^Perl_' pp.sym                                   >> perl.exp
sed -n '/^[A-Za-z]/ s/^/PL_/p'   globvar.sym           >> perl.exp

sed -n 's/^PERLVAR.*(G\([^[,]*\).*/PL_\1/p' perlvars.h >> perl.exp
sed -n 's/^PERLVAR.*(I\([^[,]*\).*/PL_\1/p' intrpvar.h >> perl.exp
sed -n 's/^PERLVAR.*(T\([^[,]*\).*/PL_\1/p' thrdvar.h  >> perl.exp

# 
# If we use the PerlIO abstraction layer, add its symbols.
#

if [ "X$useperlio" = "Xdefine" ]
then
	grep '^[A-Za-z]' perlio.sym >> perl.exp
fi

#
# Extra globals not included above (including a few that might
# not actually be defined, but there's no harm in that).
#

#cat >>perl.exp <<END
#END

case "$usemymalloc" in
true|[yY]*) usemymalloc=define ;;
esac

# Remove mymalloc if needed.
case "$usemymalloc$d_mymalloc" in
definedefine) ;;
*)
	egrep -v '^(Perl_(calloc|malloc|malloced_size|mfree|realloc|safexcalloc|safexfree|safexmalloc|safexrealloc)|^PL_malloc_mutex)$' < perl.exp > perl.exp$$
	mv -f perl.exp$$ perl.exp
	case "$ccflags" in
	*DEBUGGING*) ;;
	*)
		egrep -v '^(Perl_dump_mstats)$' < perl.exp > perl.exp$$
		mv -f perl.exp$$ perl.exp
		;;
	esac
	;;
esac

# Remove unneeded utility functions.
egrep -v '^(Perl_my_(bcopy|bzero|chsize|htonl|memcmp|memset|ntohl|swap))$' < perl.exp > perl.exp$$
mv -f perl.exp$$ perl.exp

case "$usethreads" in
true|[yY]*) usethreads=define ;;
esac

# Remove thread symbols if needed.
case "$usethreads" in
define)	;;
*)
	egrep -v '^(Perl_(condpair_magic|find_threadsv|magic_mutexfree|new_struct_thread|unlock_condpair)|^PL_((eval|nthreads)_cond|curthr|eval_owner|(cred|eval|strtab|sv|svref|threads|malloc|vtbl)_mutex|nthreads|threadnum|threadsv_names|thr_key|thrsv))$' < perl.exp > perl.exp$$
	mv -f perl.exp$$ perl.exp
	;;
esac

# Remove debugging symbols if needed.
case "$ccflags" in
*DEBUGGING*) ;;
*)
	egrep -v '^(PL_(block_type|watchaddr|watchok))$' < perl.exp > perl.exp$$
	mv -f perl.exp$$ perl.exp
	;;
esac

# Remove unneeded globals.
egrep -v '^(Perl_(ErrorNo|GetVars|same_dirent|unlnk)|PL_(cryptseen|statusvalue_vms))' < perl.exp > perl.exp$$
mv -f perl.exp$$ perl.exp

# The shebang line nicely sorts as the first one.
sort -o perl.exp -u perl.exp

# eof