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PERLTRU64(1)	       Perl Programmers Reference Guide		  PERLTRU64(1)

NAME
       README.tru64 - 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).

       gcc 3.2.1 is known to work okay with Perl 5.8.0.	 However, when
       optimizing the toke.c gcc likes to have a lot of memory, 256 megabytes
       seems to be enough.  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.

       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.

AUTHOR
       Jarkko Hietaniemi <jhi@iki.fi>

perl v5.10.1			  2009-02-12			  PERLTRU64(1)
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