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    README.irix - Perl version 5 on Irix systems


    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


            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


            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. (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 <>)  

    Linker Problems in Irix

    If you get complaints about so_locations then search in the file hints/ for ``lddflags'' and do the suggested adjustments. (David Billinghurst <>)  

    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    The old Perl 5.005 threads is obsolete, unmaintained, and its use is discouraged.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 <> 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:

      The shared object /usr/lib/ 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.  


    Jarkko Hietaniemi <>

    Please report any errors, updates, or suggestions to



    Building 32-bit Perl in Irix
    Building 64-bit Perl in Irix
    About Compiler Versions of Irix
    Linker Problems in Irix
    Malloc in Irix
    Building with threads in Irix
    Irix 5.3

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