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    1 If you read this file _as_is_, just ignore the funny characters you see.
    2 It is written in the POD format (see pod/perlpod.pod) which is specially
    3 designed to be readable as is.
    4 
    5 =head1 NAME
    6 
    7 perltru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX formerly known as DEC OSF/1) systems
    8 
    9 =head1 DESCRIPTION
   10 
   11 This document describes various features of HP's (formerly Compaq's,
   12 formerly Digital's) Unix operating system (Tru64) that will affect
   13 how Perl version 5 (hereafter just Perl) is configured, compiled
   14 and/or runs.
   15 
   16 =head2 Compiling Perl 5 on Tru64
   17 
   18 The recommended compiler to use in Tru64 is the native C compiler.
   19 The native compiler produces much faster code (the speed difference is
   20 noticeable: several dozen percentages) and also more correct code: if
   21 you are considering using the GNU C compiler you should use at the
   22 very least the release of 2.95.3 since all older gcc releases are
   23 known to produce broken code when compiling Perl.  One manifestation
   24 of this brokenness is the lib/sdbm test dumping core; another is many
   25 of the op/regexp and op/pat, or ext/Storable tests dumping core
   26 (the exact pattern of failures depending on the GCC release and
   27 optimization flags).
   28 
   29 Both the native cc and gcc seem to consume lots of memory when
   30 building Perl.  toke.c is a known trouble spot when optimizing:
   31 256 megabytes of data section seems to be enough.  Another known
   32 trouble spot is the mktables script which builds the Unicode support
   33 tables.  The default setting of the process data section in Tru64
   34 should be one gigabyte, but some sites/setups might have lowered that.
   35 The configuration process of Perl checks for too low process limits,
   36 and lowers the optimization for the toke.c if necessary, and also
   37 gives advice on how to raise the process limits
   38 (for example: C<ulimit -d 262144>)
   39 
   40 Also, Configure might abort with
   41 
   42  Build a threading Perl? [n]
   43  Configure[2437]: Syntax error at line 1 : 'config.sh' is not expected.
   44 
   45 This indicates that Configure is being run with a broken Korn shell
   46 (even though you think you are using a Bourne shell by using
   47 "sh Configure" or "./Configure").  The Korn shell bug has been reported
   48 to Compaq as of February 1999 but in the meanwhile, the reason ksh is
   49 being used is that you have the environment variable BIN_SH set to
   50 'xpg4'.  This causes /bin/sh to delegate its duties to /bin/posix/sh
   51 (a ksh).  Unset the environment variable and rerun Configure.
   52 
   53 =head2 Using Large Files with Perl on Tru64
   54 
   55 In Tru64 Perl is automatically able to use large files, that is,
   56 files larger than 2 gigabytes, there is no need to use the Configure
   57 -Duselargefiles option as described in INSTALL (though using the option
   58 is harmless).
   59 
   60 =head2 Threaded Perl on Tru64
   61 
   62 If you want to use threads, you should primarily use the Perl
   63 5.8.0 threads model by running Configure with -Duseithreads.
   64 
   65 Perl threading is going to work only in Tru64 4.0 and newer releases,
   66 older operating releases like 3.2 aren't probably going to work
   67 properly with threads.
   68 
   69 In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with gcc
   70 because the system header <pthread.h> explicitly checks for supported
   71 C compilers, gcc (at least 3.2.2) not being one of them.  But the
   72 system C compiler should work just fine.
   73 
   74 =head2 Long Doubles on Tru64
   75 
   76 You cannot Configure Perl to use long doubles unless you have at least
   77 Tru64 V5.0, the long double support simply wasn't functional enough
   78 before that.  Perl's Configure will override attempts to use the long
   79 doubles (you can notice this by Configure finding out that the modfl()
   80 function does not work as it should).
   81 
   82 At the time of this writing (June 2002), there is a known bug in the
   83 Tru64 libc printing of long doubles when not using "e" notation.
   84 The values are correct and usable, but you only get a limited number
   85 of digits displayed unless you force the issue by using C<printf
   86 "%.33e",$num> or the like.  For Tru64 versions V5.0A through V5.1A, a
   87 patch is expected sometime after perl 5.8.0 is released.  If your libc
   88 has not yet been patched, you'll get a warning from Configure when
   89 selecting long doubles.
   90 
   91 =head2 DB_File tests failing on Tru64
   92 
   93 The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you
   94 have installed a newer version of Berkeley DB into the system and the
   95 -I and -L compiler and linker flags introduce version conflicts with
   96 the DB 1.85 headers and libraries that came with the Tru64.  For example, 
   97 mixing a DB v2 library with the DB v1 headers is a bad idea.  Watch
   98 out for Configure options -Dlocincpth and -Dloclibpth, and check your
   99 /usr/local/include and /usr/local/lib since they are included by default.
  100 
  101 The second option is to explicitly instruct Configure to detect the
  102 newer Berkeley DB installation, by supplying the right directories with
  103 C<-Dlocincpth=/some/include> and C<-Dloclibpth=/some/lib> B<and> before
  104 running "make test" setting your LD_LIBRARY_PATH to F</some/lib>.
  105 
  106 The third option is to work around the problem by disabling the
  107 DB_File completely when build Perl by specifying -Ui_db to Configure,
  108 and then using the BerkeleyDB module from CPAN instead of DB_File.
  109 The BerkeleyDB works with Berkeley DB versions 2.* or greater.
  110 
  111 The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found
  112 to work.  The latest Berkeley DB can be found from L<http://www.sleepycat.com>.
  113 
  114 =head2 64-bit Perl on Tru64
  115 
  116 In Tru64 Perl's integers are automatically 64-bit wide, there is
  117 no need to use the Configure -Duse64bitint option as described
  118 in INSTALL.  Similarly, there is no need for -Duse64bitall
  119 since pointers are automatically 64-bit wide.
  120 
  121 =head2 Warnings about floating-point overflow when compiling Perl on Tru64
  122 
  123 When compiling Perl in Tru64 you may (depending on the compiler
  124 release) see two warnings like this
  125 
  126  cc: Warning: numeric.c, line 104: In this statement, floating-point
  127  overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
  128      return HUGE_VAL;
  129  -----------^
  130 
  131 and when compiling the POSIX extension
  132 
  133  cc: Warning: const-c.inc, line 2007: In this statement, floating-point
  134  overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
  135              return HUGE_VAL;
  136  -------------------^
  137 
  138 The exact line numbers may vary between Perl releases.  The warnings
  139 are benign and can be ignored: in later C compiler releases the warnings
  140 should be gone.
  141 
  142 When the file F<pp_sys.c> is being compiled you may (depending on the
  143 operating system release) see an additional compiler flag being used:
  144 C<-DNO_EFF_ONLY_OK>.  This is normal and refers to a feature that is
  145 relevant only if you use the C<filetest> pragma.  In older releases of
  146 the operating system the feature was broken and the NO_EFF_ONLY_OK
  147 instructs Perl not to use the feature.
  148 
  149 =head1 Testing Perl on Tru64
  150 
  151 During "make test" the C<comp>/C<cpp> will be skipped because on Tru64 it
  152 cannot be tested before Perl has been installed.  The test refers to
  153 the use of the C<-P> option of Perl.
  154 
  155 =head1 ext/ODBM_File/odbm Test Failing With Static Builds
  156 
  157 The ext/ODBM_File/odbm is known to fail with static builds
  158 (Configure -Uusedl) due to a known bug in Tru64's static libdbm
  159 library.  The good news is that you very probably don't need to ever
  160 use the ODBM_File extension since more advanced NDBM_File works fine,
  161 not to mention the even more advanced DB_File.
  162 
  163 =head1 Perl Fails Because Of Unresolved Symbol sockatmark
  164 
  165 If you get an error like
  166 
  167     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.
  168 
  169 you need to either recompile your Perl in Tru64 4.0D or upgrade your
  170 Tru64 4.0D to at least 4.0F: the sockatmark() system call was
  171 added in Tru64 4.0F, and the IO extension refers that symbol.
  172 
  173 =head1 read_cur_obj_info: bad file magic number
  174 
  175 You may be mixing the Tru64 cc/ar/ld with the GNU gcc/ar/ld.
  176 That may work, but sometimes it doesn't (your gcc or GNU utils
  177 may have been compiled for an incompatible OS release).
  178 
  179 Try 'which ld' and 'which ld' (or try 'ar --version' and 'ld --version',
  180 which work only for the GNU tools, and will announce themselves to be such),
  181 and adjust your PATH so that you are consistently using either
  182 the native tools or the GNU tools.  After fixing your PATH, you should
  183 do 'make distclean' and start all the way from running the Configure
  184 since you may have quite a confused situation.
  185 
  186 =head1 AUTHOR
  187 
  188 Jarkko Hietaniemi <jhi@iki.fi>
  189 
  190 =cut