There is no default dflt for usedtrace (spotted by Ivan Pozdeev)

[metaconfig.git] / U / perl / bincompat3.U

?RCS: Copyright (c) 1996, Chip Salzenberg
?RCS:
?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
?MAKE:bincompat3 d_bincompat3: Oldconfig Myread Setvar cat \
	patchlevel subversion
?MAKE:	-pick add $@ %<
?Y:TOP
?S:bincompat3:
?S:	This variable contains y if Perl 5.004 should be binary-compatible
?S:	with Perl 5.003.
?S:.
?S:d_bincompat3:
?S:	This variable conditionally defines BINCOMPAT3 so that embed.h
?S:	can take special action if Perl 5.004 should be binary-compatible
?S:	with Perl 5.003.  This is impossible for 5.004_50 and later, so
?S:	it is always $undef for those versions.
?S:.
?C:BINCOMPAT3:
?C:	This symbol, if defined, indicates that Perl 5.004 should be
?C:	binary-compatible with Perl 5.003.  This is impossible for
?C:	5.004_50 and later, so it is always undefined for those versions.
?C:.
?H:#$d_bincompat3 BINCOMPAT3			/**/
?H:.
: Binary compatibility with 5.003 is not possible with 5.004_50 and later.
if test $patchlevel -gt 4 -o $subversion -ge 50; then
    d_bincompat3=$undef
else
	$cat <<EOM

Perl 5.004 can be compiled for binary compatibility with 5.003.
If you decide to do so, you will be able to continue using any
extensions that were compiled for Perl 5.003.  However, binary
compatibility forces Perl to expose some of its internal symbols
in the same way that 5.003 did.  So you may have symbol conflicts
if you embed a binary-compatible Perl in other programs.

EOM
	case "$d_bincompat3" in
	"$undef") dflt=n ;;
	*) dflt=y ;;
	esac
	rp='Binary compatibility with Perl 5.003?'
	. ./myread
	case "$ans" in
	y*) val="$define" ;;
	*)  val="$undef" ;;
	esac
	set d_bincompat3
	eval $setvar
	case "$d_bincompat3" in
	"$define") bincompat3=y ;;
	*) bincompat3=n ;;
	esac
fi