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

6       perlbs2000 - building and installing Perl for BS2000.
7
8       This document needs to be updated, but we don't know what it should
9       say.  Please email comments to perlbug@perl.org
10       <mailto:perlbug@perl.org>.
11

SYNOPSIS

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

17       This is a ported perl for the POSIX subsystem in BS2000 VERSION OSD
18       V3.1A or later.  It may work on other versions, but we started porting
19       and testing it with 3.1A and are currently using Version V4.0A.
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21       You may need the following GNU programs in order to install perl:
22
23   gzip on BS2000
24       We used version 1.2.4, which could be installed out of the box with one
25       failure during 'make check'.
26
27   bison on BS2000
28       The yacc coming with BS2000 POSIX didn't work for us.  So we had to use
29       bison.  We had to make a few changes to perl in order to use the pure
30       (reentrant) parser of bison.  We used version 1.25, but we had to add a
31       few changes due to EBCDIC.  See below for more details concerning yacc.
32
33   Unpacking Perl Distribution on BS2000
34       To extract an ASCII tar archive on BS2000 POSIX you need an ASCII
35       filesystem (we used the mountpoint /usr/local/ascii for this).  Now you
36       extract the archive in the ASCII filesystem without I/O-conversion:
37
38       cd /usr/local/ascii export IO_CONVERSION=NO gunzip <
39       /usr/local/src/perl.tar.gz | pax -r
40
41       You may ignore the error message for the first element of the archive
42       (this doesn't look like a tar archive / skipping to next file...), it's
43       only the directory which will be created automatically anyway.
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45       After extracting the archive you copy the whole directory tree to your
46       EBCDIC filesystem.  This time you use I/O-conversion:
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48       cd /usr/local/src IO_CONVERSION=YES cp -r /usr/local/ascii/perl5.005_02
49       ./
50
51   Compiling Perl on BS2000
52       There is a "hints" file for BS2000 called hints.posix-bc (because
53       posix-bc is the OS name given by `uname`) that specifies the correct
54       values for most things.  The major problem is (of course) the EBCDIC
55       character set.  We have german EBCDIC version.
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57       Because of our problems with the native yacc we used GNU bison to
58       generate a pure (=reentrant) parser for perly.y.  So our yacc is really
59       the following script:
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61       -----8<-----/usr/local/bin/yacc-----8<----- #! /usr/bin/sh
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63       # Bison as a reentrant yacc:
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65       # save parameters: params="" while [[ $# -gt 1 ]]; do
66           params="$params $1"
67           shift done
68
69       # add flag %pure_parser:
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71       tmpfile=/tmp/bison.$$.y echo %pure_parser > $tmpfile cat $1 >> $tmpfile
72
73       # call bison:
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75       echo "/usr/local/bin/bison --yacc $params $1\t\t\t(Pure Parser)"
76       /usr/local/bin/bison --yacc $params $tmpfile
77
78       # cleanup:
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80       rm -f $tmpfile -----8<----------8<-----
81
82       We still use the normal yacc for a2p.y though!!!  We made a softlink
83       called byacc to distinguish between the two versions:
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85       ln -s /usr/bin/yacc /usr/local/bin/byacc
86
87       We build perl using GNU make.  We tried the native make once and it
88       worked too.
89
90   Testing Perl on BS2000
91       We still got a few errors during "make test".  Some of them are the
92       result of using bison.  Bison prints parser error instead of syntax
93       error, so we may ignore them.  The following list shows our errors,
94       your results may differ:
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96       op/numconvert.......FAILED tests 1409-1440 op/regexp...........FAILED
97       tests 483, 496 op/regexp_noamp.....FAILED tests 483, 496
98       pragma/overload.....FAILED tests 152-153, 170-171
99       pragma/warnings.....FAILED tests 14, 82, 129, 155, 192, 205, 207
100       lib/bigfloat........FAILED tests 351-352, 355
101       lib/bigfltpm........FAILED tests 354-355, 358
102       lib/complex.........FAILED tests 267, 487 lib/dumper..........FAILED
103       tests 43, 45 Failed 11/231 test scripts, 95.24% okay. 57/10595 subtests
104       failed, 99.46% okay.
105
106   Installing Perl on BS2000
107       We have no nroff on BS2000 POSIX (yet), so we ignored any errors while
108       installing the documentation.
109
110   Using Perl in the Posix-Shell of BS2000
111       BS2000 POSIX doesn't support the shebang notation
112       ("#!/usr/local/bin/perl"), so you have to use the following lines
113       instead:
114
115       : # use perl
116           eval 'exec /usr/local/bin/perl -S $0 ${1+"$@"}'
117               if $running_under_some_shell;
118
119   Using Perl in "native" BS2000
120       We don't have much experience with this yet, but try the following:
121
122       Copy your Perl executable to a BS2000 LLM using bs2cp:
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124       "bs2cp /usr/local/bin/perl 'bs2:perl(perl,l)'"
125
126       Now you can start it with the following (SDF) command:
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128       "/START-PROG FROM-FILE=*MODULE(PERL,PERL),PROG-MODE=*ANY,RUN-MODE=*ADV"
129
130       First you get the BS2000 commandline prompt ('*').  Here you may enter
131       your parameters, e.g. "-e 'print "Hello World!\\n";'" (note the double
132       backslash!) or "-w" and the name of your Perl script.  Filenames
133       starting with "/" are searched in the Posix filesystem, others are
134       searched in the BS2000 filesystem.  You may even use wildcards if you
135       put a "%" in front of your filename (e.g. "-w checkfiles.pl %*.c").
136       Read your C/C++ manual for additional possibilities of the commandline
137       prompt (look for PARAMETER-PROMPTING).
138
139   Floating point anomalies on BS2000
140       There appears to be a bug in the floating point implementation on
141       BS2000 POSIX systems such that calling int() on the product of a number
142       and a small magnitude number is not the same as calling int() on the
143       quotient of that number and a large magnitude number.  For example, in
144       the following Perl code:
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146           my $x = 100000.0;
147           my $y = int($x * 1e-5) * 1e5; # '0'
148           my $z = int($x / 1e+5) * 1e5;  # '100000'
149           print "\$y is $y and \$z is $z\n"; # $y is 0 and $z is 100000
150
151       Although one would expect the quantities $y and $z to be the same and
152       equal to 100000 they will differ and instead will be 0 and 100000
153       respectively.
154
155   Using PerlIO and different encodings on ASCII and EBCDIC partitions
156       Since version 5.8 Perl uses the new PerlIO on BS2000.  This enables you
157       using different encodings per IO channel.  For example you may use
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159           use Encode;
160           open($f, ">:encoding(ascii)", "test.ascii");
161           print $f "Hello World!\n";
162           open($f, ">:encoding(posix-bc)", "test.ebcdic");
163           print $f "Hello World!\n";
164           open($f, ">:encoding(latin1)", "test.latin1");
165           print $f "Hello World!\n";
166           open($f, ">:encoding(utf8)", "test.utf8");
167           print $f "Hello World!\n";
168
169       to get two files containing "Hello World!\n" in ASCII, EBCDIC, ISO
170       Latin-1 (in this example identical to ASCII) respective UTF-EBCDIC (in
171       this example identical to normal EBCDIC).  See the documentation of
172       Encode::PerlIO for details.
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174       As the PerlIO layer uses raw IO internally, all this totally ignores
175       the type of your filesystem (ASCII or EBCDIC) and the IO_CONVERSION
176       environment variable.  If you want to get the old behavior, that the
177       BS2000 IO functions determine conversion depending on the filesystem
178       PerlIO still is your friend.  You use IO_CONVERSION as usual and tell
179       Perl, that it should use the native IO layer:
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181           export IO_CONVERSION=YES
182           export PERLIO=stdio
183
184       Now your IO would be ASCII on ASCII partitions and EBCDIC on EBCDIC
185       partitions.  See the documentation of PerlIO (without "Encode::"!)  for
186       further possibilities.
187

AUTHORS

189       Thomas Dorner
190

SEE ALSO

192       INSTALL, perlport.
193
194   Mailing list
195       If you are interested in the z/OS (formerly known as OS/390) and POSIX-
196       BC (BS2000) ports of Perl then see the perl-mvs mailing list.  To
197       subscribe, send an empty message to perl-mvs-subscribe@perl.org.
198
199       See also:
200
201           http://lists.perl.org/list/perl-mvs.html
202
203       There are web archives of the mailing list at:
204
205           http://www.xray.mpe.mpg.de/mailing-lists/perl-mvs/
206           http://archive.develooper.com/perl-mvs@perl.org/
207

HISTORY

209       This document was originally written by Thomas Dorner for the 5.005
210       release of Perl.
211
212       This document was podified for the 5.6 release of perl 11 July 2000.
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216perl v5.26.3                      2018-03-01                     PERLBS2000(1)
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