perlos400 - Perl version 5 on OS/400

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   This document describes various features of IBM's OS/400 operating
   system that will affect how Perl version 5 (hereafter just Perl) is
   compiled and/or runs.

   By far the easiest way to build Perl for OS/400 is to use the PASE
   (Portable Application Solutions Environment), for more information see
   <> This
   environment allows one to use AIX APIs while programming, and it
   provides a runtime that allows AIX binaries to execute directly on the
   PowerPC iSeries.

   Compiling Perl for OS/400 PASE
   The recommended way to build Perl for the OS/400 PASE is to build the
   Perl 5 source code (release 5.8.1 or later) under AIX.

   The trick is to give a special parameter to the Configure shell script
   when running it on AIX:

     sh Configure -DPASE ...

   The default installation directory of Perl under PASE is
   /QOpenSys/perl.  This can be modified if needed with Configure
   parameter -Dprefix=/some/dir.

   Starting from OS/400 V5R2 the IBM Visual Age compiler is supported on
   OS/400 PASE, so it is possible to build Perl natively on OS/400.  The
   easier way, however, is to compile in AIX, as just described.

   If you don't want to install the compiled Perl in AIX into /QOpenSys
   (for packaging it before copying it to PASE), you can use a Configure
   parameter: -Dinstallprefix=/tmp/QOpenSys/perl.  This will cause the
   "make install" to install everything into that directory, while the
   installed files still think they are (will be) in /QOpenSys/perl.

   If building natively on PASE, please do the build under the /QOpenSys
   directory, since Perl is happier when built on a case sensitive

   Installing Perl in OS/400 PASE
   If you are compiling on AIX, simply do a "make install" on the AIX box.
   Once the install finishes, tar up the /QOpenSys/perl directory.
   Transfer the tarball to the OS/400 using FTP with the following

     > binary
     > site namefmt 1
     > put perl.tar /QOpenSys

   Once you have it on, simply bring up a PASE shell and extract the

   If you are compiling in PASE, then "make install" is the only thing you
   will need to do.

   The default path for perl binary is /QOpenSys/perl/bin/perl.  You'll
   want to symlink /QOpenSys/usr/bin/perl to this file so you don't have
   to modify your path.

   Using Perl in OS/400 PASE
   Perl in PASE may be used in the same manner as you would use Perl on

   Scripts starting with #!/usr/bin/perl should work if you have
   /QOpenSys/usr/bin/perl symlinked to your perl binary.  This will not
   work if you've done a setuid/setgid or have environment variable
   PASE_EXEC_QOPENSYS="N".  If you have V5R1, you'll need to get the
   latest PTFs to have this feature.  Scripts starting with
   #!/QOpenSys/perl/bin/perl should always work.

   Known Problems
   When compiling in PASE, there is no "oslevel" command.  Therefore, you
   may want to create a script called "oslevel" that echoes the level of
   AIX that your version of PASE runtime supports.  If you're unsure,
   consult your documentation or use "".

   If you have test cases that fail, check for the existence of spool
   files.  The test case may be trying to use a syscall that is not
   implemented in PASE.  To avoid the SIGILL, try setting the
   PASE_SYSCALL_NOSIGILL environment variable or have a handler for the
   SIGILL.  If you can compile programs for PASE, run the config script
   and edit when it gives you the option.  If you want to remove
   fchdir(), which isn't implement in V5R1, simply change the line that




   and then compile Perl.  The places where fchdir() is used have
   alternatives for systems that do not have fchdir() available.

   Perl on ILE
   There exists a port of Perl to the ILE environment.  This port,
   however, is based quite an old release of Perl, Perl 5.00502 (August
   1998).  (As of July 2002 the latest release of Perl is 5.8.0, and even
   5.6.1 has been out since April 2001.)  If you need to run Perl on ILE,
   though, you may need this older port:
   <> Note that any Perl release later
   than 5.00502 has not been ported to ILE.

   If you need to use Perl in the ILE environment, you may want to
   consider using Qp2RunPase() to call the PASE version of Perl.


   Jarkko Hietaniemi <> Bryan Logan <> David
   Larson <>


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