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

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

10       This document describes various features of HP's (formerly Compaq's,
11       formerly Digital's) Unix operating system (Tru64) that will affect how
12       Perl version 5 (hereafter just Perl) is configured, compiled and/or
13       runs.
14
15   Compiling Perl 5 on Tru64
16       The recommended compiler to use in Tru64 is the native C compiler.  The
17       native compiler produces much faster code (the speed difference is
18       noticeable: several dozen percentages) and also more correct code: if
19       you are considering using the GNU C compiler you should use at the very
20       least the release of 2.95.3 since all older gcc releases are known to
21       produce broken code when compiling Perl.  One manifestation of this
22       brokenness is the lib/sdbm test dumping core; another is many of the
23       op/regexp and op/pat, or ext/Storable tests dumping core (the exact
24       pattern of failures depending on the GCC release and optimization
25       flags).
26
27       Both the native cc and gcc seem to consume lots of memory when building
28       Perl.  toke.c is a known trouble spot when optimizing: 256 megabytes of
29       data section seems to be enough.  Another known trouble spot is the
30       mktables script which builds the Unicode support tables.  The default
31       setting of the process data section in Tru64 should be one gigabyte,
32       but some sites/setups might have lowered that.  The configuration
33       process of Perl checks for too low process limits, and lowers the
34       optimization for the toke.c if necessary, and also gives advice on how
35       to raise the process limits (for example: "ulimit -d 262144")
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37       Also, Configure might abort with
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39        Build a threading Perl? [n]
40        Configure[2437]: Syntax error at line 1 : 'config.sh' is not expected.
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42       This indicates that Configure is being run with a broken Korn shell
43       (even though you think you are using a Bourne shell by using "sh
44       Configure" or "./Configure").  The Korn shell bug has been reported to
45       Compaq as of February 1999 but in the meanwhile, the reason ksh is
46       being used is that you have the environment variable BIN_SH set to
47       'xpg4'.  This causes /bin/sh to delegate its duties to /bin/posix/sh (a
48       ksh).  Unset the environment variable and rerun Configure.
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50   Using Large Files with Perl on Tru64
51       In Tru64 Perl is automatically able to use large files, that is, files
52       larger than 2 gigabytes, there is no need to use the Configure
53       -Duselargefiles option as described in INSTALL (though using the option
54       is harmless).
55
56   Threaded Perl on Tru64
57       If you want to use threads, you should primarily use the Perl 5.8.0
58       threads model by running Configure with -Duseithreads.
59
60       Perl threading is going to work only in Tru64 4.0 and newer releases,
61       older operating releases like 3.2 aren't probably going to work
62       properly with threads.
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64       In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with
65       gcc because the system header <pthread.h> explicitly checks for
66       supported C compilers, gcc (at least 3.2.2) not being one of them.  But
67       the system C compiler should work just fine.
68
69   Long Doubles on Tru64
70       You cannot Configure Perl to use long doubles unless you have at least
71       Tru64 V5.0, the long double support simply wasn't functional enough
72       before that.  Perl's Configure will override attempts to use the long
73       doubles (you can notice this by Configure finding out that the modfl()
74       function does not work as it should).
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76       At the time of this writing (June 2002), there is a known bug in the
77       Tru64 libc printing of long doubles when not using "e" notation.  The
78       values are correct and usable, but you only get a limited number of
79       digits displayed unless you force the issue by using "printf
80       "%.33e",$num" or the like.  For Tru64 versions V5.0A through V5.1A, a
81       patch is expected sometime after perl 5.8.0 is released.  If your libc
82       has not yet been patched, you'll get a warning from Configure when
83       selecting long doubles.
84
85   DB_File tests failing on Tru64
86       The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you have
87       installed a newer version of Berkeley DB into the system and the -I and
88       -L compiler and linker flags introduce version conflicts with the DB
89       1.85 headers and libraries that came with the Tru64.  For example,
90       mixing a DB v2 library with the DB v1 headers is a bad idea.  Watch out
91       for Configure options -Dlocincpth and -Dloclibpth, and check your
92       /usr/local/include and /usr/local/lib since they are included by
93       default.
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95       The second option is to explicitly instruct Configure to detect the
96       newer Berkeley DB installation, by supplying the right directories with
97       "-Dlocincpth=/some/include" and "-Dloclibpth=/some/lib" and before
98       running "make test" setting your LD_LIBRARY_PATH to /some/lib.
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100       The third option is to work around the problem by disabling the DB_File
101       completely when build Perl by specifying -Ui_db to Configure, and then
102       using the BerkeleyDB module from CPAN instead of DB_File.  The
103       BerkeleyDB works with Berkeley DB versions 2.* or greater.
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105       The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found to
106       work.  The latest Berkeley DB can be found from
107       <http://www.sleepycat.com>.
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109   64-bit Perl on Tru64
110       In Tru64 Perl's integers are automatically 64-bit wide, there is no
111       need to use the Configure -Duse64bitint option as described in INSTALL.
112       Similarly, there is no need for -Duse64bitall since pointers are
113       automatically 64-bit wide.
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115   Warnings about floating-point overflow when compiling Perl on Tru64
116       When compiling Perl in Tru64 you may (depending on the compiler
117       release) see two warnings like this
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119        cc: Warning: numeric.c, line 104: In this statement, floating-point
120        overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
121            return HUGE_VAL;
122        -----------^
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124       and when compiling the POSIX extension
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126        cc: Warning: const-c.inc, line 2007: In this statement, floating-point
127        overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
128                    return HUGE_VAL;
129        -------------------^
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131       The exact line numbers may vary between Perl releases.  The warnings
132       are benign and can be ignored: in later C compiler releases the
133       warnings should be gone.
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135       When the file pp_sys.c is being compiled you may (depending on the
136       operating system release) see an additional compiler flag being used:
137       "-DNO_EFF_ONLY_OK".  This is normal and refers to a feature that is
138       relevant only if you use the "filetest" pragma.  In older releases of
139       the operating system the feature was broken and the NO_EFF_ONLY_OK
140       instructs Perl not to use the feature.
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Testing Perl on Tru64

143       During "make test" the "comp"/"cpp" will be skipped because on Tru64 it
144       cannot be tested before Perl has been installed.  The test refers to
145       the use of the "-P" option of Perl.
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ext/ODBM_File/odbm Test Failing With Static Builds

148       The ext/ODBM_File/odbm is known to fail with static builds (Configure
149       -Uusedl) due to a known bug in Tru64's static libdbm library.  The good
150       news is that you very probably don't need to ever use the ODBM_File
151       extension since more advanced NDBM_File works fine, not to mention the
152       even more advanced DB_File.
153

Perl Fails Because Of Unresolved Symbol sockatmark

155       If you get an error like
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157           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.
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159       you need to either recompile your Perl in Tru64 4.0D or upgrade your
160       Tru64 4.0D to at least 4.0F: the sockatmark() system call was added in
161       Tru64 4.0F, and the IO extension refers that symbol.
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read_cur_obj_info: bad file magic number

164       You may be mixing the Tru64 cc/ar/ld with the GNU gcc/ar/ld.  That may
165       work, but sometimes it doesn't (your gcc or GNU utils may have been
166       compiled for an incompatible OS release).
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168       Try 'which ld' and 'which ld' (or try 'ar --version' and 'ld
169       --version', which work only for the GNU tools, and will announce
170       themselves to be such), and adjust your PATH so that you are
171       consistently using either the native tools or the GNU tools.  After
172       fixing your PATH, you should do 'make distclean' and start all the way
173       from running the Configure since you may have quite a confused
174       situation.
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AUTHOR

177       Jarkko Hietaniemi <jhi@iki.fi>
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181perl v5.32.1                      2021-05-31                      PERLTRU64(1)
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