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 is configured, compiled and/or runs.
+how Perl version 5 (hereafter just Perl) is configured, compiled
+and/or runs.
=head2 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 the gcc
-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 the op/regexp and op/pat,
-or ext/Storable tests dumping core (depending on the GCC release).
+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.
=head2 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.
+-Duselargefiles option as described in INSTALL (though using the option
+is harmless).
=head2 Threaded Perl on Tru64
-If you want to use threads, you should primarily use the new Perl
+If you want to use threads, you should primarily use the Perl
5.8.0 threads model by running Configure with -Duseithreads.
-The old Perl 5.005 threads is obsolete, unmaintained, and its use is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.
+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.
-Either thread model 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.
=head2 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.
+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.
has not yet been patched, you'll get a warning from Configure when
selecting long doubles.
+=head2 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
+C<-Dlocincpth=/some/include> and C<-Dloclibpth=/some/lib> B<and> before
+running "make test" setting your LD_LIBRARY_PATH to F</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 F<http://www.sleepycat.com>.
+
=head2 64-bit Perl on Tru64
In Tru64 Perl's integers are automatically 64-bit wide, there is
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.
+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 F<pp_sys.c> is being compiled you may (depending on the
operating system release) see an additional compiler flag being used:
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: the sockatmark() system call was added in Tru64 4.0F, and
-the IO extension refers that symbol.
+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.
=head1 AUTHOR
https://perl5.git.perl.org / perl5.git / blobdiff