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1 | |
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2 | Compress-Raw-Zlib |
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3 | |
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4 | Version 2.012 |
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5 | |
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6 | 15th July 2008 |
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7 | |
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8 | Copyright (c) 2005-2008 Paul Marquess. All rights reserved. |
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9 | This program is free software; you can redistribute it |
10 | and/or modify it under the same terms as Perl itself. |
11 | |
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12 | The directory zlib-src contains a subset of the |
13 | source files copied directly from zlib version 1.2.3. |
14 | These files are Copyright(C) 1995-2005 |
15 | Jean-loup Gailly and Mark Adler. |
16 | Full source for the zlib library is available at |
17 | http://www.zlib.org |
18 | |
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19 | DESCRIPTION |
20 | ----------- |
21 | |
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22 | This module provides a Perl interface to the zlib compression library. |
23 | |
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24 | PREREQUISITES |
25 | ------------- |
26 | |
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27 | Before you can build Compress-Raw-Zlib you need to have the following |
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28 | installed on your system: |
29 | |
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30 | * A C compiler |
31 | |
32 | * Perl 5.004 or better. |
33 | |
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34 | By default, Compress-Raw-Zlib will build its own private copy of the |
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35 | zlib library. If you want to use a different version of |
36 | zlib, follow the instructions in the section called |
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37 | "Controlling the version of zlib used by Compress-Raw-Zlib" |
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38 | later in this document. |
39 | |
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40 | BUILDING THE MODULE |
41 | ------------------- |
42 | |
43 | Assuming you have met all the prerequisites, the module can now be built |
44 | using this sequence of commands: |
45 | |
46 | perl Makefile.PL |
47 | make |
48 | make test |
49 | |
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50 | INSTALLATION |
51 | ------------ |
52 | |
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53 | To install Compress-Raw-Zlib, run the command below: |
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54 | |
55 | make install |
56 | |
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57 | Controlling the version of zlib used by Compress-Raw-Zlib |
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58 | ---------------------------------------------------------- |
59 | |
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60 | Compress-Raw-Zlib interfaces to the zlib compression library. There |
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61 | are three options available to control which version/instance of the |
62 | zlib library is used: |
63 | |
64 | 1. Build a private copy of the zlib library using the |
65 | zlib library source that is included with this module. |
66 | This is the default and recommended option. |
67 | |
68 | 2. Build a private copy of the zlib library using a standard |
69 | zlib source distribution. |
70 | |
71 | 3. Use a pre-built zlib library. |
72 | |
73 | Note that if you intend to use either Option 2 or 3, you need to have |
74 | zlib version 1.0.5 or better. |
75 | |
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76 | The contents of the file config.in are used to control which of the |
77 | three options is actually used. This file is read during the |
78 | |
79 | perl Makefile.PL |
80 | |
81 | step of the build, so remember to make any required changes to config.in |
82 | before building this module. |
83 | |
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84 | Option 1 |
85 | -------- |
86 | |
87 | For option 1, edit the file config.in and set the variables in it |
88 | as follows: |
89 | |
90 | BUILD_ZLIB = True |
91 | INCLUDE = ./zlib-src |
92 | LIB = ./zlib-src |
93 | OLD_ZLIB = False |
94 | GZIP_OS_CODE = AUTO_DETECT |
95 | |
96 | |
97 | Option 2 |
98 | -------- |
99 | |
100 | For option 2, fetch a copy of the zlib source distribution from |
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101 | http://www.zlib.org and unpack it into the Compress-Raw-Zlib source |
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102 | directory. Assuming you have fetched zlib 1.2.3, |
103 | it will create a directory called zlib-1.2.3. |
104 | |
105 | Now set the variables in the file config.in as follows (if the version |
106 | you have fetched isn't 1.2.3, change the INCLUDE and LIB |
107 | variables appropriately): |
108 | |
109 | BUILD_ZLIB = True |
110 | INCLUDE = ./zlib-1.2.3 |
111 | LIB = ./zlib-1.2.3 |
112 | OLD_ZLIB = False |
113 | GZIP_OS_CODE = AUTO_DETECT |
114 | |
115 | |
116 | Option 3 |
117 | -------- |
118 | |
119 | For option 3, you need to find out where zlib is stored on your |
120 | system. There are two parts to this. |
121 | |
122 | First, find the directory where the zlib library is stored (some |
123 | common names for the library are libz.a and libz.so). Set the LIB variable |
124 | in the config.in file to that directory. |
125 | |
126 | Secondly, find the directory where the file zlib.h is stored. Now set |
127 | the INCLUDE variable in the config.in file to that directory. |
128 | |
129 | Next set BUILD_ZLIB to False. |
130 | |
131 | Finally, if you are running zlib 1.0.5 or older, set the OLD_ZLIB |
132 | variable to True. Otherwise set it to False. |
133 | |
134 | As an example, if the zlib library on your system is in |
135 | /usr/local/lib, zlib.h is in /usr/local/include and zlib is more |
136 | recent than version 1.0.5, the variables in config.in should be set as |
137 | follows: |
138 | |
139 | BUILD_ZLIB = False |
140 | INCLUDE = /usr/local/include |
141 | LIB = /usr/local/lib |
142 | OLD_ZLIB = False |
143 | GZIP_OS_CODE = AUTO_DETECT |
144 | |
145 | |
146 | Setting the Gzip OS Code |
147 | ------------------------ |
148 | |
149 | Every gzip stream stores a byte in its header to identify the Operating |
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150 | System that was used to create the gzip stream. When you build Compress-Raw-Zlib it will attempt to determine the value that is correct for |
151 | your Operating System. This will then be used by IO::Compress::Gzip as the |
152 | default value for the OS byte in all gzip headers it creates. |
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153 | |
154 | The variable GZIP_OS_CODE in the config.in file controls the setting of |
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155 | this value when building Compress-Raw-Zlib. If GZIP_OS_CODE is set to |
156 | AUTO_DETECT, Compress-Raw-Zlib will attempt to determine the correct value for |
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157 | your Operating System. |
158 | |
159 | Alternatively, you can override auto-detection of the default OS code and |
160 | explicitly set it yourself. Set the GZIP_OS_CODE variable in the config.in |
161 | file to be a number between 0 and 255. For example |
162 | |
163 | GZIP_OS_CODE = 3 |
164 | |
165 | See RFC 1952 for valid OS codes that can be used. |
166 | |
167 | If you are running one of the less popular Operating Systems, it is |
168 | possible that the default value picked by this module is incorrect or the |
169 | default value (3) is used when there is a better value available. When |
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170 | Compress-Raw-Zlib cannot determine what operating system you are running, it |
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171 | will use the default value 3 for the OS code. |
172 | |
173 | If you find you have to change this value, because you think the value auto |
174 | detected is incorrect, please take a few moments to contact the author of |
175 | this module. |
176 | |
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177 | TROUBLESHOOTING |
178 | --------------- |
179 | |
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180 | Solaris build fails with "language optional software package not installed" |
181 | --------------------------------------------------------------------------- |
182 | |
183 | If you are trying to build this module under Solaris and you get an |
184 | error message like this |
185 | |
186 | /usr/ucb/cc: language optional software package not installed |
187 | |
188 | it means that Perl cannot find the C compiler on your system. The cryptic |
189 | message is just Sun's way of telling you that you haven't bought their |
190 | C compiler. |
191 | |
192 | When you build a Perl module that needs a C compiler, the Perl build |
193 | system tries to use the same C compiler that was used to build perl |
194 | itself. In this case your Perl binary was built with a C compiler that |
195 | lived in /usr/ucb. |
196 | |
197 | To continue with building this module, you need to get a C compiler, |
198 | or tell Perl where your C compiler is, if you already have one. |
199 | |
200 | Assuming you have now got a C compiler, what you do next will be dependent |
201 | on what C compiler you have installed. If you have just installed Sun's |
202 | C compiler, you shouldn't have to do anything. Just try rebuilding |
203 | this module. |
204 | |
205 | If you have installed another C compiler, say gcc, you have to tell perl |
206 | how to use it instead of /usr/ucb/cc. |
207 | |
208 | This set of options seems to work if you want to use gcc. Your mileage |
209 | may vary. |
210 | |
211 | perl Makefile.PL CC=gcc CCCDLFLAGS=-fPIC OPTIMIZE=" " |
212 | make test |
213 | |
214 | If that doesn't work for you, it's time to make changes to the Makefile |
215 | by hand. Good luck! |
216 | |
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217 | Solaris build fails with "gcc: unrecognized option `-KPIC'" |
218 | ----------------------------------------------------------- |
219 | |
220 | You are running Solaris and you get an error like this when you try to |
221 | build this Perl module |
222 | |
223 | gcc: unrecognized option `-KPIC' |
224 | |
225 | This symptom usually means that you are using a Perl binary that has been |
226 | built with the Sun C compiler, but you are using gcc to build this module. |
227 | |
228 | When Perl builds modules that need a C compiler, it will attempt to use |
229 | the same C compiler and command line options that was used to build perl |
230 | itself. In this case "-KPIC" is a valid option for the Sun C compiler, |
231 | but not for gcc. The equivalent option for gcc is "-fPIC". |
232 | |
233 | The solution is either: |
234 | |
235 | 1. Build both Perl and this module with the same C compiler, either |
236 | by using the Sun C compiler for both or gcc for both. |
237 | |
238 | 2. Try generating the Makefile for this module like this perl |
239 | |
240 | perl Makefile.PL CC=gcc CCCDLFLAGS=-fPIC OPTIMIZE=" " LD=gcc |
241 | make test |
242 | |
243 | This second option seems to work when mixing a Perl binary built |
244 | with the Sun C compiler and this module built with gcc. Your |
245 | mileage may vary. |
246 | |
247 | HP-UX Notes |
248 | ----------- |
249 | |
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250 | I've had a report that when building Compress-Raw-Zlib under HP-UX that it |
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251 | is necessary to have first built the zlib library with the -fpic |
252 | option. |
253 | |
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254 | Linux Notes |
255 | ----------- |
256 | |
257 | Although most Linux distributions already come with zlib, some |
258 | people report getting this error when they try to build this module: |
259 | |
260 | $ make |
261 | cp Zlib.pm blib/lib/Compress/Zlib.pm |
262 | AutoSplitting blib/lib/Compress/Zlib.pm (blib/lib/auto/Compress/Zlib) |
263 | /usr/bin/perl -I/usr/lib/perl5/5.6.1/i386-linux -I/usr/lib/perl5/5.6.1 /usr/lib/perl5/5.6.1/ExtUtils/xsubpp -typemap /usr/lib/perl5/5.6.1/ExtUtils/typemap -typemap typemap Zlib.xs > Zlib.xsc && mv Zlib.xsc Zlib.c |
264 | gcc -c -I/usr/local/include -fno-strict-aliasing -I/usr/local/include -O2 -march=i386 -mcpu=i686 -DVERSION=\"1.16\" -DXS_VERSION=\"1.16\" -fPIC -I/usr/lib/perl5/5.6.1/i386-linux/CORE Zlib.c |
265 | Zlib.xs:25:19: zlib.h: No such file or directory |
266 | make: *** [Zlib.o] Error 1 |
267 | |
268 | This usually means that you have not installed the development RPM |
269 | for zlib. Check for an RPM that start with "zlib-devel" in your Linux |
270 | distribution. |
271 | |
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272 | Win32 Notes |
273 | ----------- |
274 | |
275 | If you are running Activestate Perl (from http://www.activestate.com), |
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276 | it ships with a pre-compiled version of Compress-Raw-Zlib. To check if a |
277 | newer version of Compress-Raw-Zlib is available run this from the command |
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278 | prompt |
279 | |
280 | C:\> ppm verify -upgrade Compress-Zlib |
281 | |
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282 | If you are not running Activestate Perl and you don't have access |
283 | to a C compiler, you will not be able to build and install this module. |
284 | |
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285 | Win32 & Cygwin Notes |
286 | -------------------- |
287 | |
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288 | It is not possible to install Compress-Raw-Zlib using the CPAN shell. |
289 | This is because the Compress-Raw-Zlib DLL is itself used by the CPAN shell |
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290 | and it is impossible to remove a DLL while it is already loaded under |
291 | Windows. |
292 | |
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293 | The workaround is to install Compress-Raw-Zlib manually using the |
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294 | instructions given at the start of this file. |
295 | |
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296 | FEEDBACK |
297 | -------- |
298 | |
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299 | How to report a problem with Compress-Raw-Zlib. |
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300 | |
301 | To help me help you, I need all of the following information: |
302 | |
303 | 1. The Versions of everything relevant. |
304 | This includes: |
305 | |
306 | a. The *complete* output from running this |
307 | |
308 | perl -V |
309 | |
310 | Do not edit the output in any way. |
311 | Note, I want you to run "perl -V" and NOT "perl -v". |
312 | |
313 | If your perl does not understand the "-V" option it is too |
314 | old. This module needs Perl version 5.004 or better. |
315 | |
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316 | b. The version of Compress-Raw-Zlib you have. |
317 | If you have successfully installed Compress-Raw-Zlib, this one-liner |
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318 | will tell you: |
319 | |
320 | perl -MCompress::Raw::Zlib -e 'print qq[ver $Compress::Raw::Zlib::VERSION\n]' |
321 | |
322 | If you are running windows use this |
323 | |
324 | perl -MCompress::Raw::Zlib -e "print qq[ver $Compress::Raw::Zlib::VERSION\n]" |
325 | |
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326 | If you haven't installed Compress-Raw-Zlib then search Compress::Raw::Zlib.pm |
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327 | for a line like this: |
328 | |
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329 | $VERSION = "2.012" ; |
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330 | |
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331 | c. The version of zlib you have used. |
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332 | If you have successfully installed Compress-Raw-Zlib, this one-liner |
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333 | will tell you: |
334 | |
335 | perl -MCompress::Raw::Zlib -e "print q[zlib ver ]. Compress::Raw::Zlib::ZLIB_VERSION.qq[\n]" |
336 | |
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337 | If not, look at the beginning of the file zlib.h. |
338 | |
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339 | 2. If you are having problems building Compress-Raw-Zlib, send me a |
340 | complete log of what happened. Start by unpacking the Compress-Raw-Zlib |
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341 | module into a fresh directory and keep a log of all the steps |
342 | |
343 | [edit config.in, if necessary] |
344 | perl Makefile.PL |
345 | make |
346 | make test TEST_VERBOSE=1 |
347 | |
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348 | Paul Marquess <pmqs@cpan.org> |