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perlbs2000 (1)


perlbs2000 - building and installing Perl for BS2000.


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


Perl Programmers Reference Guide                    PERLBS2000(1)

     README.BS2000 - building and installing Perl for BS2000.

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

     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

  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

     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

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     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

     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

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     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 $running_under_some_shell;

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

     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:


     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
     %*.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

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     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
     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

     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 posibilities.

     Thomas Dorner

     See attributes(5) for descriptions of the following

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     |Availability   | runtime/perl-512 |
     |Stability      | Uncommitted      |
     INSTALL, perlport.

  Mailing list
     If you are interested in the VM/ESA, 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

     See also:

     There are web archives of the mailing list at:

     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.

     This software was built from source available at  The original
     community source was downloaded from

     Further information about this software can be found on the
     open source community website at

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