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PERLBS2000(1)	       Perl Programmers	Reference Guide		 PERLBS2000(1)

NAME
       perlbs2000 - building and installing Perl for BS2000.

       This document needs to be updated, but we don't know what it should
       say.  Please submit comments to <https://github.com/Perl/perl5/issues>.

SYNOPSIS
       This document will help you Configure, build, test and install Perl on
       BS2000 in the POSIX subsystem.

DESCRIPTION
       This is a ported	perl for the POSIX subsystem in	BS2000 VERSION OSD
       V3.1A or	later.	It may work on other versions, but we started porting
       and testing it with 3.1A	and are	currently using	Version	V4.0A.

       You may need the	following GNU programs in order	to install perl:

   gzip	on BS2000
       We used version 1.2.4, which could be installed out of the box with one
       failure during 'make check'.

   bison on BS2000
       The yacc	coming with BS2000 POSIX didn't	work for us.  So we had	to use
       bison.  We had to make a	few changes to perl in order to	use the	pure
       (reentrant) parser of bison.  We	used version 1.25, but we had to add a
       few changes due to EBCDIC.  See below for more details concerning yacc.

   Unpacking Perl Distribution on BS2000
       To extract an ASCII tar archive on BS2000 POSIX you need	an ASCII
       filesystem (we used the mountpoint /usr/local/ascii for this).  Now you
       extract the archive in the ASCII	filesystem without I/O-conversion:

       cd /usr/local/ascii export IO_CONVERSION=NO gunzip <
       /usr/local/src/perl.tar.gz | pax	-r

       You may ignore the error	message	for the	first element of the archive
       (this doesn't look like a tar archive / skipping	to next	file...), it's
       only the	directory which	will be	created	automatically anyway.

       After extracting	the archive you	copy the whole directory tree to your
       EBCDIC filesystem.  This	time you use I/O-conversion:

       cd /usr/local/src IO_CONVERSION=YES cp -r /usr/local/ascii/perl5.005_02
       ./

   Compiling Perl on BS2000
       There is	a "hints" file for BS2000 called hints.posix-bc	(because
       posix-bc	is the OS name given by	`uname`) that specifies	the correct
       values for most things.	The major problem is (of course) the EBCDIC
       character set.  We have german EBCDIC version.

       Because of our problems with the	native yacc we used GNU	bison to
       generate	a pure (=reentrant) parser for perly.y.	 So our	yacc is	really
       the following script:

       -----8<-----/usr/local/bin/yacc-----8<----- #! /usr/bin/sh

       # Bison as a reentrant yacc:

       # save parameters: params="" while [[ $#	-gt 1 ]]; do
	   params="$params $1"
	   shift done

       # add flag %pure_parser:

       tmpfile=/tmp/bison.$$.y echo %pure_parser > $tmpfile cat	$1 >> $tmpfile

       # call bison:

       echo "/usr/local/bin/bison --yacc $params $1\t\t\t(Pure Parser)"
       /usr/local/bin/bison --yacc $params $tmpfile

       # cleanup:

       rm -f $tmpfile -----8<----------8<-----

       We still	use the	normal yacc for	a2p.y though!!!	 We made a softlink
       called byacc to distinguish between the two versions:

       ln -s /usr/bin/yacc /usr/local/bin/byacc

       We build	perl using GNU make.  We tried the native make once and	it
       worked too.

   Testing Perl	on BS2000
       We still	got a few errors during	"make test".  Some of them are the
       result of using bison.  Bison prints parser error instead of syntax
       error, so we may	ignore them.  The following list shows our errors,
       your results may	differ:

       op/numconvert.......FAILED tests	1409-1440 op/regexp...........FAILED
       tests 483, 496 op/regexp_noamp.....FAILED tests 483, 496
       pragma/overload.....FAILED tests	152-153, 170-171
       pragma/warnings.....FAILED tests	14, 82,	129, 155, 192, 205, 207
       lib/bigfloat........FAILED tests	351-352, 355
       lib/bigfltpm........FAILED tests	354-355, 358
       lib/complex.........FAILED tests	267, 487 lib/dumper..........FAILED
       tests 43, 45 Failed 11/231 test scripts,	95.24% okay. 57/10595 subtests
       failed, 99.46% okay.

   Installing Perl on BS2000
       We have no nroff	on BS2000 POSIX	(yet), so we ignored any errors	while
       installing the documentation.

   Using Perl in the Posix-Shell of BS2000
       BS2000 POSIX doesn't support the	shebang	notation
       ("#!/usr/local/bin/perl"), so you have to use the following lines
       instead:

       : # use perl
	   eval	'exec /usr/local/bin/perl -S $0	${1+"$@"}'
	       if 0; # ^ Run only under	a shell

   Using Perl in "native" BS2000
       We don't	have much experience with this yet, but	try the	following:

       Copy your Perl executable to a BS2000 LLM using bs2cp:

       "bs2cp /usr/local/bin/perl 'bs2:perl(perl,l)'"

       Now you can start it with the following (SDF) command:

       "/START-PROG FROM-FILE=*MODULE(PERL,PERL),PROG-MODE=*ANY,RUN-MODE=*ADV"

       First you get the BS2000	commandline prompt ('*').  Here	you may	enter
       your parameters,	e.g. "-e 'print	"Hello World!\\n";'" (note the double
       backslash!) or "-w" and the name	of your	Perl script.  Filenames
       starting	with "/" are searched in the Posix filesystem, others are
       searched	in the BS2000 filesystem.  You may even	use wildcards if you
       put a "%" in front of your filename (e.g. "-w checkfiles.pl %*.c").
       Read your C/C++ manual for additional possibilities of the commandline
       prompt (look for	PARAMETER-PROMPTING).

   Floating point anomalies on BS2000
       There appears to	be a bug in the	floating point implementation on
       BS2000 POSIX systems such that calling int() on the product of a	number
       and a small magnitude number is not the same as calling int() on	the
       quotient	of that	number and a large magnitude number.  For example, in
       the following Perl code:

	   my $x = 100000.0;
	   my $y = int($x * 1e-5) * 1e5; # '0'
	   my $z = int($x / 1e+5) * 1e5;  # '100000'
	   print "\$y is $y and	\$z is $z\n"; #	$y is 0	and $z is 100000

       Although	one would expect the quantities	$y and $z to be	the same and
       equal to	100000 they will differ	and instead will be 0 and 100000
       respectively.

   Using PerlIO	and different encodings	on ASCII and EBCDIC partitions
       Since version 5.8 Perl uses the new PerlIO on BS2000.  This enables you
       using different encodings per IO	channel.  For example you may use

	   use Encode;
	   open($f, ">:encoding(ascii)", "test.ascii");
	   print $f "Hello World!\n";
	   open($f, ">:encoding(posix-bc)", "test.ebcdic");
	   print $f "Hello World!\n";
	   open($f, ">:encoding(latin1)", "test.latin1");
	   print $f "Hello World!\n";
	   open($f, ">:encoding(utf8)",	"test.utf8");
	   print $f "Hello World!\n";

       to get two files	containing "Hello World!\n" in ASCII, EBCDIC, ISO
       Latin-1 (in this	example	identical to ASCII) respective UTF-EBCDIC (in
       this example identical to normal	EBCDIC).  See the documentation	of
       Encode::PerlIO for details.

       As the PerlIO layer uses	raw IO internally, all this totally ignores
       the type	of your	filesystem (ASCII or EBCDIC) and the IO_CONVERSION
       environment variable.  If you want to get the old behavior, that	the
       BS2000 IO functions determine conversion	depending on the filesystem
       PerlIO still is your friend.  You use IO_CONVERSION as usual and	tell
       Perl, that it should use	the native IO layer:

	   export IO_CONVERSION=YES
	   export PERLIO=stdio

       Now your	IO would be ASCII on ASCII partitions and EBCDIC on EBCDIC
       partitions.  See	the documentation of PerlIO (without "Encode::"!)  for
       further possibilities.

AUTHORS
       Thomas Dorner

SEE ALSO
       INSTALL,	perlport.

   Mailing list
       If you are interested in	the z/OS (formerly known as OS/390) and	POSIX-
       BC (BS2000) ports of Perl then see the perl-mvs mailing list.  To
       subscribe, send an empty	message	to perl-mvs-subscribe@perl.org.

       See also:

	   https://lists.perl.org/list/perl-mvs.html

       There are web archives of the mailing list at:

	   https://www.nntp.perl.org/group/perl.mvs/

HISTORY
       This document was originally written by Thomas Dorner for the 5.005
       release of Perl.

       This document was podified for the 5.6 release of perl 11 July 2000.

perl v5.34.0			  2020-10-04			 PERLBS2000(1)

NAME | SYNOPSIS | DESCRIPTION | AUTHORS | SEE ALSO | HISTORY

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