PERLIRIX(1)						 Perl Programmers Reference Guide					       PERLIRIX(1)

NAME

       README.irix - Perl version 5 on Irix systems

DESCRIPTION

       This document describes various features of Irix that will affect how Perl version 5 (hereafter just Perl) is compiled and/or runs.

       Building 32-bit Perl in Irix

       Use

	       sh Configure -Dcc='cc -n32'

       to compile Perl 32-bit.	Don't bother with -n32 unless you have 7.1 or later compilers (use cc -version to check).

       (Building 'cc -n32' is the default.)

       Building 64-bit Perl in Irix

       Use

	       sh Configure -Dcc='cc -64' -Duse64bitint

       This requires require a 64-bit MIPS CPU (R8000, R10000, ...)

       You can also use

	       sh Configure -Dcc='cc -64' -Duse64bitall

       but that makes no difference compared with the -Duse64bitint because of the "cc -64".

       You can also do

	       sh Configure -Dcc='cc -n32' -Duse64bitint

       to use long longs for the 64-bit integer type, in case you don't have a 64-bit CPU.

       If you are using gcc, just

	       sh Configure -Dcc=gcc -Duse64bitint

       should be enough, the Configure should automatically probe for the correct 64-bit settings.

       About Compiler Versions of Irix

       Some Irix cc versions, e.g. 7.3.1.1m (try cc -version) have been known to have issues (coredumps) when compiling perl.c.  If you've used
       -OPT:fast_io=ON and this happens, try removing it.  If that fails, or you didn't use that, then try adjusting other optimization options
       (-LNO, -INLINE, -O3 to -O2, etcetera).  The compiler bug has been reported to SGI.  (Allen Smith <easmith@beatrice.rutgers.edu>)

       Linker Problems in Irix

       If you get complaints about so_locations then search in the file hints/irix_6.sh for "lddflags" and do the suggested adjustments.  (David
       Billinghurst <David.Billinghurst@riotinto.com.au>)

       Malloc in Irix

       Do not try to use Perl's malloc, this will lead into very mysterious errors (especially with -Duse64bitall).

       Building with threads in Irix

       Run Configure with -Duseithreads which will configure Perl with the new Perl 5.8.0 "interpreter threads", see threads.

       The old Perl 5.005 threads is obsolete, unmaintained, and its use is discouraged.  If you really want it, run Configure with the
       -Dusethreads -Duse5005threads options as described in INSTALL.

       For either thread model and for Irix 6.2, you have to have the following patches installed:

	       1404 Irix 6.2 Posix 1003.1b man pages
	       1645 Irix 6.2 & 6.3 POSIX header file updates
	       2000 Irix 6.2 Posix 1003.1b support modules
	       2254 Pthread library fixes
	       2401 6.2 all platform kernel rollup

       IMPORTANT: Without patch 2401, a kernel bug in Irix 6.2 will cause your machine to panic and crash when running threaded perl.  Irix 6.3
       and later are okay.

	   Thanks to Hannu Napari <Hannu.Napari@hut.fi> for the IRIX
	   pthreads patches information.

AUTHOR

       Jarkko Hietaniemi <jhi@iki.fi>

       Please report any errors, updates, or suggestions to perlbug@perl.org.

perl v5.8.0							    2003-02-18							       PERLIRIX(1)