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    1 If you read this file _as_is_, just ignore the funny characters you see.
    2 It is written in the POD format (see pod/perlpod.pod) which is specially
    3 designed to be readable as is.
    4 
    5 =head1 NAME
    6 
    7 perlos400 - Perl version 5 on OS/400
    8 
    9 B<This document needs to be updated, but we don't know what it should say.
   10 Please submit comments to L<https://github.com/Perl/perl5/issues>.>
   11 
   12 =head1 DESCRIPTION
   13 
   14 This document describes various features of IBM's OS/400 operating
   15 system that will affect how Perl version 5 (hereafter just Perl) is
   16 compiled and/or runs.
   17 
   18 By far the easiest way to build Perl for OS/400 is to use the PASE
   19 (Portable Application Solutions Environment), for more information see
   20 L<http://www.iseries.ibm.com/developer/factory/pase/index.html>
   21 This environment allows one to use AIX APIs while programming, and it
   22 provides a runtime that allows AIX binaries to execute directly on the
   23 PowerPC iSeries.
   24 
   25 =head2 Compiling Perl for OS/400 PASE
   26 
   27 The recommended way to build Perl for the OS/400 PASE is to build the
   28 Perl 5 source code (release 5.8.1 or later) under AIX.
   29 
   30 The trick is to give a special parameter to the Configure shell script
   31 when running it on AIX:
   32 
   33   sh Configure -DPASE ...
   34 
   35 The default installation directory of Perl under PASE is /QOpenSys/perl.
   36 This can be modified if needed with Configure parameter -Dprefix=/some/dir.
   37 
   38 Starting from OS/400 V5R2 the IBM Visual Age compiler is supported
   39 on OS/400 PASE, so it is possible to build Perl natively on OS/400.  
   40 The easier way, however, is to compile in AIX, as just described.
   41 
   42 If you don't want to install the compiled Perl in AIX into /QOpenSys
   43 (for packaging it before copying it to PASE), you can use a Configure
   44 parameter: -Dinstallprefix=/tmp/QOpenSys/perl.  This will cause the
   45 "make install" to install everything into that directory, while the
   46 installed files still think they are (will be) in /QOpenSys/perl.
   47 
   48 If building natively on PASE, please do the build under the /QOpenSys
   49 directory, since Perl is happier when built on a case sensitive filesystem.
   50 
   51 =head2 Installing Perl in OS/400 PASE
   52 
   53 If you are compiling on AIX, simply do a "make install" on the AIX box.
   54 Once the install finishes, tar up the /QOpenSys/perl directory.  Transfer
   55 the tarball to the OS/400 using FTP with the following commands:
   56 
   57   > binary
   58   > site namefmt 1
   59   > put perl.tar /QOpenSys
   60 
   61 Once you have it on, simply bring up a PASE shell and extract the tarball.
   62 
   63 If you are compiling in PASE, then "make install" is the only thing you
   64 will need to do.
   65 
   66 The default path for perl binary is /QOpenSys/perl/bin/perl.  You'll
   67 want to symlink /QOpenSys/usr/bin/perl to this file so you don't have
   68 to modify your path.
   69 
   70 =head2 Using Perl in OS/400 PASE
   71 
   72 Perl in PASE may be used in the same manner as you would use Perl on AIX.
   73 
   74 Scripts starting with #!/usr/bin/perl should work if you have
   75 /QOpenSys/usr/bin/perl symlinked to your perl binary.  This will not
   76 work if you've done a setuid/setgid or have environment variable
   77 PASE_EXEC_QOPENSYS="N".  If you have V5R1, you'll need to get the
   78 latest PTFs to have this feature.  Scripts starting with
   79 #!/QOpenSys/perl/bin/perl should always work.
   80 
   81 =head2 Known Problems
   82 
   83 When compiling in PASE, there is no "oslevel" command.  Therefore,
   84 you may want to create a script called "oslevel" that echoes the
   85 level of AIX that your version of PASE runtime supports.  If you're
   86 unsure, consult your documentation or use "4.3.3.0".
   87 
   88 If you have test cases that fail, check for the existence of spool files.
   89 The test case may be trying to use a syscall that is not implemented
   90 in PASE.  To avoid the SIGILL, try setting the PASE_SYSCALL_NOSIGILL
   91 environment variable or have a handler for the SIGILL.  If you can
   92 compile programs for PASE, run the config script and edit config.sh
   93 when it gives you the option.  If you want to remove fchdir(), which
   94 isn't implement in V5R1, simply change the line that says:
   95 
   96 d_fchdir='define'
   97 
   98 to
   99 
  100 d_fchdir='undef'
  101 
  102 and then compile Perl.  The places where fchdir() is used have
  103 alternatives for systems that do not have fchdir() available.
  104 
  105 =head2 Perl on ILE
  106 
  107 There exists a port of Perl to the ILE environment.  This port, however,
  108 is based quite an old release of Perl, Perl 5.00502 (August 1998).
  109 (As of July 2002 the latest release of Perl is 5.8.0, and even 5.6.1
  110 has been out since April 2001.)  If you need to run Perl on ILE, though,
  111 you may need this older port: L<http://www.cpan.org/ports/#os400>
  112 Note that any Perl release later than 5.00502 has not been ported to ILE.
  113 
  114 If you need to use Perl in the ILE environment, you may want to consider
  115 using Qp2RunPase() to call the PASE version of Perl.
  116 
  117 =head1 AUTHORS
  118 
  119 Jarkko Hietaniemi <jhi@iki.fi>
  120 Bryan Logan <bryanlog@us.ibm.com>
  121 David Larson <larson1@us.ibm.com>
  122 
  123 =cut