perltru64(1)


NAME

   perltru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX
   formerly known as DEC OSF/1) systems

DESCRIPTION

   This document describes various features of HP's (formerly Compaq's,
   formerly Digital's) Unix operating system (Tru64) that will affect how
   Perl version 5 (hereafter just Perl) is configured, compiled and/or
   runs.

   Compiling Perl 5 on Tru64
   The recommended compiler to use in Tru64 is the native C compiler.  The
   native compiler produces much faster code (the speed difference is
   noticeable: several dozen percentages) and also more correct code: if
   you are considering using the GNU C compiler you should use at the very
   least the release of 2.95.3 since all older gcc releases are known to
   produce broken code when compiling Perl.  One manifestation of this
   brokenness is the lib/sdbm test dumping core; another is many of the
   op/regexp and op/pat, or ext/Storable tests dumping core (the exact
   pattern of failures depending on the GCC release and optimization
   flags).

   Both the native cc and gcc seem to consume lots of memory when building
   Perl.  toke.c is a known trouble spot when optimizing: 256 megabytes of
   data section seems to be enough.  Another known trouble spot is the
   mktables script which builds the Unicode support tables.  The default
   setting of the process data section in Tru64 should be one gigabyte,
   but some sites/setups might have lowered that.  The configuration
   process of Perl checks for too low process limits, and lowers the
   optimization for the toke.c if necessary, and also gives advice on how
   to raise the process limits (for example: "ulimit -d 262144")

   Also, Configure might abort with

    Build a threading Perl? [n]
    Configure[2437]: Syntax error at line 1 : 'config.sh' is not expected.

   This indicates that Configure is being run with a broken Korn shell
   (even though you think you are using a Bourne shell by using "sh
   Configure" or "./Configure").  The Korn shell bug has been reported to
   Compaq as of February 1999 but in the meanwhile, the reason ksh is
   being used is that you have the environment variable BIN_SH set to
   'xpg4'.  This causes /bin/sh to delegate its duties to /bin/posix/sh (a
   ksh).  Unset the environment variable and rerun Configure.

   Using Large Files with Perl on Tru64
   In Tru64 Perl is automatically able to use large files, that is, files
   larger than 2 gigabytes, there is no need to use the Configure
   -Duselargefiles option as described in INSTALL (though using the option
   is harmless).

   Threaded Perl on Tru64
   If you want to use threads, you should primarily use the Perl 5.8.0
   threads model by running Configure with -Duseithreads.

   Perl threading is going to work only in Tru64 4.0 and newer releases,
   older operating releases like 3.2 aren't probably going to work
   properly with threads.

   In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with
   gcc because the system header <pthread.h> explicitly checks for
   supported C compilers, gcc (at least 3.2.2) not being one of them.  But
   the system C compiler should work just fine.

   Long Doubles on Tru64
   You cannot Configure Perl to use long doubles unless you have at least
   Tru64 V5.0, the long double support simply wasn't functional enough
   before that.  Perl's Configure will override attempts to use the long
   doubles (you can notice this by Configure finding out that the modfl()
   function does not work as it should).

   At the time of this writing (June 2002), there is a known bug in the
   Tru64 libc printing of long doubles when not using "e" notation.  The
   values are correct and usable, but you only get a limited number of
   digits displayed unless you force the issue by using "printf
   "%.33e",$num" or the like.  For Tru64 versions V5.0A through V5.1A, a
   patch is expected sometime after perl 5.8.0 is released.  If your libc
   has not yet been patched, you'll get a warning from Configure when
   selecting long doubles.

   DB_File tests failing on Tru64
   The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you have
   installed a newer version of Berkeley DB into the system and the -I and
   -L compiler and linker flags introduce version conflicts with the DB
   1.85 headers and libraries that came with the Tru64.  For example,
   mixing a DB v2 library with the DB v1 headers is a bad idea.  Watch out
   for Configure options -Dlocincpth and -Dloclibpth, and check your
   /usr/local/include and /usr/local/lib since they are included by
   default.

   The second option is to explicitly instruct Configure to detect the
   newer Berkeley DB installation, by supplying the right directories with
   "-Dlocincpth=/some/include" and "-Dloclibpth=/some/lib" and before
   running "make test" setting your LD_LIBRARY_PATH to /some/lib.

   The third option is to work around the problem by disabling the DB_File
   completely when build Perl by specifying -Ui_db to Configure, and then
   using the BerkeleyDB module from CPAN instead of DB_File.  The
   BerkeleyDB works with Berkeley DB versions 2.* or greater.

   The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found to
   work.  The latest Berkeley DB can be found from
   <http://www.sleepycat.com>.

   64-bit Perl on Tru64
   In Tru64 Perl's integers are automatically 64-bit wide, there is no
   need to use the Configure -Duse64bitint option as described in INSTALL.
   Similarly, there is no need for -Duse64bitall since pointers are
   automatically 64-bit wide.

   Warnings about floating-point overflow when compiling Perl on Tru64
   When compiling Perl in Tru64 you may (depending on the compiler
   release) see two warnings like this

    cc: Warning: numeric.c, line 104: In this statement, floating-point
    overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
        return HUGE_VAL;
    -----------^

   and when compiling the POSIX extension

    cc: Warning: const-c.inc, line 2007: In this statement, floating-point
    overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
                return HUGE_VAL;
    -------------------^

   The exact line numbers may vary between Perl releases.  The warnings
   are benign and can be ignored: in later C compiler releases the
   warnings should be gone.

   When the file pp_sys.c is being compiled you may (depending on the
   operating system release) see an additional compiler flag being used:
   "-DNO_EFF_ONLY_OK".  This is normal and refers to a feature that is
   relevant only if you use the "filetest" pragma.  In older releases of
   the operating system the feature was broken and the NO_EFF_ONLY_OK
   instructs Perl not to use the feature.

Testing Perl on Tru64

   During "make test" the "comp"/"cpp" will be skipped because on Tru64 it
   cannot be tested before Perl has been installed.  The test refers to
   the use of the "-P" option of Perl.

ext/ODBM_File/odbm Test Failing With Static Builds

   The ext/ODBM_File/odbm is known to fail with static builds (Configure
   -Uusedl) due to a known bug in Tru64's static libdbm library.  The good
   news is that you very probably don't need to ever use the ODBM_File
   extension since more advanced NDBM_File works fine, not to mention the
   even more advanced DB_File.

Perl Fails Because Of Unresolved Symbol sockatmark

   If you get an error like

       Can't load '.../OSF1/lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so' for module IO: Unresolved symbol in .../lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so: sockatmark at .../lib/perl5/5.8.0/alpha-dec_osf/XSLoader.pm line 75.

   you need to either recompile your Perl in Tru64 4.0D or upgrade your
   Tru64 4.0D to at least 4.0F: the sockatmark() system call was added in
   Tru64 4.0F, and the IO extension refers that symbol.

read_cur_obj_info: bad file magic number

   You may be mixing the Tru64 cc/ar/ld with the GNU gcc/ar/ld.  That may
   work, but sometimes it doesn't (your gcc or GNU utils may have been
   compiled for an incompatible OS release).

   Try 'which ld' and 'which ld' (or try 'ar --version' and 'ld
   --version', which work only for the GNU tools, and will announce
   themselves to be such), and adjust your PATH so that you are
   consistently using either the native tools or the GNU tools.  After
   fixing your PATH, you should do 'make distclean' and start all the way
   from running the Configure since you may have quite a confused
   situation.

AUTHOR

   Jarkko Hietaniemi <jhi@iki.fi>


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