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5 =head1 NAME
7 perltru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX formerly known as DEC OSF/1) systems
9 =head1 DESCRIPTION
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.
16 =head2 Compiling Perl 5 on Tru64
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).
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>)
40 Also, Configure might abort with
42 Build a threading Perl? [n]
43 Configure: Syntax error at line 1 : 'config.sh' is not expected.
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.
53 =head2 Using Large Files with Perl on Tru64
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).
60 =head2 Threaded Perl on Tru64
62 If you want to use threads, you should primarily use the Perl
63 5.8.0 threads model by running Configure with -Duseithreads.
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.
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.
74 =head2 Long Doubles on Tru64
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).
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.
91 =head2 DB_File tests failing on Tru64
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.
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>.
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.
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>.
114 =head2 64-bit Perl on Tru64
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.
121 =head2 Warnings about floating-point overflow when compiling Perl on Tru64
123 When compiling Perl in Tru64 you may (depending on the compiler
124 release) see two warnings like this
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;
131 and when compiling the POSIX extension
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;
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.
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.
149 =head1 Testing Perl on Tru64
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.
155 =head1 ext/ODBM_File/odbm Test Failing With Static Builds
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.
163 =head1 Perl Fails Because Of Unresolved Symbol sockatmark
165 If you get an error like
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.
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.
173 =head1 read_cur_obj_info: bad file magic number
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).
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.
186 =head1 AUTHOR
188 Jarkko Hietaniemi <firstname.lastname@example.org>