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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
       Perl 5.8.0 "interpreter threads", see threads.

       For Irix 6.2 with perl threads, 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.

   Irix 5.3
       While running Configure and when building, you are likely to get quite
       a few of these warnings:

	 ld:
	 The shared object /usr/lib/libm.so did not resolve any symbols.
	       You may want to remove it from your link line.

       Ignore them: in IRIX 5.3 there is no way to quieten ld about this.

       During compilation you will see this warning from toke.c:

	 uopt: Warning: Perl_yylex: this procedure not optimized because it
	       exceeds size threshold; to optimize this procedure, use -Olimit option
	       with value >= 4252.

       Ignore the warning.

       In IRIX 5.3 and with Perl 5.8.1 (Perl 5.8.0 didn't compile in IRIX 5.3)
       the following failures are known.

	Failed Test		     Stat Wstat Total Fail  Failed  List of Failed
	--------------------------------------------------------------------------
	../ext/List/Util/t/shuffle.t	0   139	   ??	??	 %  ??
	../lib/Math/Trig.t	      255 65280	   29	12  41.38%  24-29
	../lib/sort.t			0   138	  119	72  60.50%  48-119
	56 tests and 474 subtests skipped.
	Failed 3/811 test scripts, 99.63% okay. 78/75813 subtests failed, 99.90% okay.

       They are suspected to be compiler errors (at least the shuffle.t
       failure is known from some IRIX 6 setups) and math library errors (the
       Trig.t failure), but since IRIX 5 is long since end-of-lifed, further
       fixes for the IRIX are unlikely.	 If you can get gcc for 5.3, you could
       try that, too, since gcc in IRIX 6 is a known workaround for at least
       the shuffle.t and sort.t failures.

AUTHOR
       Jarkko Hietaniemi <jhi@iki.fi>

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

perl v5.10.1			  2009-02-12			   PERLIRIX(1)
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