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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 | README.tru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX formerly known as DEC OSF/1) systems | |
8 | ||
9 | =head1 DESCRIPTION | |
10 | ||
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11 | This document describes various features of HP's (formerly Compaq's, |
12 | formerly Digital's) Unix operating system (Tru64) that will affect | |
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13 | how Perl version 5 (hereafter just Perl) is configured, compiled |
14 | and/or runs. | |
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15 | |
16 | =head2 Compiling Perl 5 on Tru64 | |
17 | ||
18 | The recommended compiler to use in Tru64 is the native C compiler. | |
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19 | The native compiler produces much faster code (the speed difference is |
20 | noticeable: several dozen percentages) and also more correct code: if | |
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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). | |
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532eb838 MB |
29 | gcc 3.2.1 is known to work okay with Perl 5.8.0. However, when |
30 | optimizing the toke.c gcc likes to have a lot of memory, 256 megabytes | |
31 | seems to be enough. The default setting of the process data section | |
32 | in Tru64 should be one gigabyte, but some sites/setups might have | |
33 | lowered that. The configuration process of Perl checks for too low | |
34 | process limits, and lowers the optimization for the toke.c if | |
35 | necessary, and also gives advice on how to raise the process limits. | |
36 | ||
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37 | =head2 Using Large Files with Perl on Tru64 |
38 | ||
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39 | In Tru64 Perl is automatically able to use large files, that is, |
40 | files larger than 2 gigabytes, there is no need to use the Configure | |
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41 | -Duselargefiles option as described in INSTALL (though using the option |
42 | is harmless). | |
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43 | |
44 | =head2 Threaded Perl on Tru64 | |
45 | ||
294f22c5 | 46 | If you want to use threads, you should primarily use the Perl |
88ec1f5d | 47 | 5.8.0 threads model by running Configure with -Duseithreads. |
ea3bceb2 | 48 | |
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49 | Perl threading is going to work only in Tru64 4.0 and newer releases, |
50 | older operating releases like 3.2 aren't probably going to work | |
51 | properly with threads. | |
ea3bceb2 | 52 | |
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53 | In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with gcc |
54 | because the system header <pthread.h> explicitly checks for supported | |
55 | C compilers, gcc (at least 3.2.2) not being one of them. But the | |
56 | system C compiler should work just fine. | |
57 | ||
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58 | =head2 Long Doubles on Tru64 |
59 | ||
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60 | You cannot Configure Perl to use long doubles unless you have at least |
61 | Tru64 V5.0, the long double support simply wasn't functional enough | |
62 | before that. Perl's Configure will override attempts to use the long | |
63 | doubles (you can notice this by Configure finding out that the modfl() | |
64 | function does not work as it should). | |
bef5f079 | 65 | |
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66 | At the time of this writing (June 2002), there is a known bug in the |
67 | Tru64 libc printing of long doubles when not using "e" notation. | |
68 | The values are correct and usable, but you only get a limited number | |
69 | of digits displayed unless you force the issue by using C<printf | |
70 | "%.33e",$num> or the like. For Tru64 versions V5.0A through V5.1A, a | |
71 | patch is expected sometime after perl 5.8.0 is released. If your libc | |
72 | has not yet been patched, you'll get a warning from Configure when | |
73 | selecting long doubles. | |
fa17d112 | 74 | |
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75 | =head2 DB_File tests failing on Tru64 |
76 | ||
77 | The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you | |
78 | have installed a newer version of Berkeley DB into the system and the | |
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79 | -I and -L compiler and linker flags introduce version conflicts with |
80 | the DB 1.85 headers and libraries that came with the Tru64. For example, | |
81 | mixing a DB v2 library with the DB v1 headers is a bad idea. Watch | |
82 | out for Configure options -Dlocincpth and -Dloclibpth, and check your | |
83 | /usr/local/include and /usr/local/lib since they are included by default. | |
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84 | |
85 | The second option is to explicitly instruct Configure to detect the | |
86 | newer Berkeley DB installation, by supplying the right directories with | |
87 | C<-Dlocincpth=/some/include> and C<-Dloclibpth=/some/lib> B<and> before | |
88 | running "make test" setting your LD_LIBRARY_PATH to F</some/lib>. | |
89 | ||
90 | The third option is to work around the problem by disabling the | |
91 | DB_File completely when build Perl by specifying -Ui_db to Configure, | |
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92 | and then using the BerkeleyDB module from CPAN instead of DB_File. |
93 | The BerkeleyDB works with Berkeley DB versions 2.* or greater. | |
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94 | |
95 | The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found | |
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96 | to work. The latest Berkeley DB can be found from F<http://www.sleepycat.com>. |
97 | ||
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98 | =head2 64-bit Perl on Tru64 |
99 | ||
100 | In Tru64 Perl's integers are automatically 64-bit wide, there is | |
101 | no need to use the Configure -Duse64bitint option as described | |
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102 | in INSTALL. Similarly, there is no need for -Duse64bitall |
103 | since pointers are automatically 64-bit wide. | |
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104 | |
105 | =head2 Warnings about floating-point overflow when compiling Perl on Tru64 | |
106 | ||
107 | When compiling Perl in Tru64 you may (depending on the compiler | |
108 | release) see two warnings like this | |
109 | ||
d780cd7a | 110 | cc: Warning: numeric.c, line 104: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl) |
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111 | return HUGE_VAL; |
112 | -----------^ | |
113 | ||
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114 | and when compiling the POSIX extension |
115 | ||
116 | cc: Warning: const-c.inc, line 2007: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl) | |
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117 | return HUGE_VAL; |
118 | -------------------^ | |
119 | ||
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120 | The exact line numbers may vary between Perl releases. The warnings |
121 | are benign and can be ignored: in later C compiler releases the warnings | |
122 | should be gone. | |
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123 | |
124 | When the file F<pp_sys.c> is being compiled you may (depending on the | |
125 | operating system release) see an additional compiler flag being used: | |
126 | C<-DNO_EFF_ONLY_OK>. This is normal and refers to a feature that is | |
127 | relevant only if you use the C<filetest> pragma. In older releases of | |
128 | the operating system the feature was broken and the NO_EFF_ONLY_OK | |
129 | instructs Perl not to use the feature. | |
130 | ||
131 | =head1 Testing Perl on Tru64 | |
132 | ||
133 | During "make test" the C<comp/cpp> will be skipped because on Tru64 it | |
134 | cannot be tested before Perl has been installed. The test refers to | |
135 | the use of the C<-P> option of Perl. | |
136 | ||
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137 | =head1 ext/ODBM_File/odbm Test Failing With Static Builds |
138 | ||
139 | The ext/ODBM_File/odbm is known to fail with static builds | |
88ec1f5d | 140 | (Configure -Uusedl) due to a known bug in Tru64's static libdbm |
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141 | library. The good news is that you very probably don't need to ever |
142 | use the ODBM_File extension since more advanced NDBM_File works fine, | |
143 | not to mention the even more advanced DB_File. | |
144 | ||
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145 | =head1 Perl Fails Because Of Unresolved Symbol sockatmark |
146 | ||
147 | If you get an error like | |
148 | ||
4282de36 | 149 | 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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150 | |
151 | you need to either recompile your Perl in Tru64 4.0D or upgrade your | |
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152 | Tru64 4.0D to at least 4.0F: the sockatmark() system call was |
153 | added in Tru64 4.0F, and the IO extension refers that symbol. | |
9a8de003 | 154 | |
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155 | =head1 AUTHOR |
156 | ||
157 | Jarkko Hietaniemi <jhi@iki.fi> | |
158 | ||
159 | =cut |