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Typos in PrepareRelease; include 16-bit in make distcheck; fix RunTest and 
RunGrepTest when building in non-source directory; problem in pcretest when no 
UTF or 16-bit support; other tidies consequent on building a tarball.

1 nigel 41 README file for PCRE (Perl-compatible regular expression library)
2     -----------------------------------------------------------------
3 nigel 3
4 ph10 374 The latest release of PCRE is always available in three alternative formats
5     from:
6 nigel 43
7     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
8 ph10 374 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.bz2
9     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.zip
10 ph10 123
11 ph10 111 There is a mailing list for discussion about the development of PCRE at
12 nigel 43
13 ph10 123 pcre-dev@exim.org
14    
15 nigel 41 Please read the NEWS file if you are upgrading from a previous release.
16 ph10 109 The contents of this README file are:
17 nigel 23
18 ph10 109 The PCRE APIs
19     Documentation for PCRE
20     Contributions by users of PCRE
21     Building PCRE on non-Unix systems
22 ph10 122 Building PCRE on Unix-like systems
23     Retrieving configuration information on Unix-like systems
24 ph10 109 Shared libraries on Unix-like systems
25 ph10 122 Cross-compiling on Unix-like systems
26 ph10 109 Using HP's ANSI C++ compiler (aCC)
27 ph10 461 Using PCRE from MySQL
28 ph10 111 Making new tarballs
29 ph10 109 Testing PCRE
30     Character tables
31     File manifest
32 nigel 35
33 ph10 109
34 nigel 77 The PCRE APIs
35     -------------
36    
37 ph10 842 PCRE is written in C, and it has its own API. There are two sets of functions,
38 ph10 840 one for the 8-bit library, which processes strings of bytes, and one for the
39     16-bit library, which processes strings of 16-bit values. The distribution also
40     includes a set of C++ wrapper functions (see the pcrecpp man page for details),
41     courtesy of Google Inc., which can be used to call the 8-bit PCRE library from
42     C++.
43 nigel 77
44 ph10 842 In addition, there is a set of C wrapper functions (again, just for the 8-bit
45 ph10 840 library) that are based on the POSIX regular expression API (see the pcreposix
46     man page). These end up in the library called libpcreposix. Note that this just
47     provides a POSIX calling interface to PCRE; the regular expressions themselves
48     still follow Perl syntax and semantics. The POSIX API is restricted, and does
49     not give full access to all of PCRE's facilities.
50 nigel 77
51 ph10 109 The header file for the POSIX-style functions is called pcreposix.h. The
52     official POSIX name is regex.h, but I did not want to risk possible problems
53     with existing files of that name by distributing it that way. To use PCRE with
54     an existing program that uses the POSIX API, pcreposix.h will have to be
55     renamed or pointed at by a link.
56    
57 nigel 73 If you are using the POSIX interface to PCRE and there is already a POSIX regex
58 ph10 109 library installed on your system, as well as worrying about the regex.h header
59     file (as mentioned above), you must also take care when linking programs to
60 nigel 73 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
61 ph10 109 up the POSIX functions of the same name from the other library.
62 nigel 49
63 ph10 109 One way of avoiding this confusion is to compile PCRE with the addition of
64 ph10 122 -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
65     compiler flags (CFLAGS if you are using "configure" -- see below). This has the
66     effect of renaming the functions so that the names no longer clash. Of course,
67     you have to do the same thing for your applications, or write them using the
68     new names.
69 nigel 73
70 ph10 109
71 nigel 75 Documentation for PCRE
72     ----------------------
73    
74 ph10 122 If you install PCRE in the normal way on a Unix-like system, you will end up
75     with a set of man pages whose names all start with "pcre". The one that is just
76     called "pcre" lists all the others. In addition to these man pages, the PCRE
77     documentation is supplied in two other forms:
78 nigel 75
79 ph10 109 1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
80     doc/pcretest.txt in the source distribution. The first of these is a
81     concatenation of the text forms of all the section 3 man pages except
82     those that summarize individual functions. The other two are the text
83     forms of the section 1 man pages for the pcregrep and pcretest commands.
84     These text forms are provided for ease of scanning with text editors or
85 ph10 123 similar tools. They are installed in <prefix>/share/doc/pcre, where
86 ph10 111 <prefix> is the installation prefix (defaulting to /usr/local).
87 nigel 75
88 ph10 109 2. A set of files containing all the documentation in HTML form, hyperlinked
89 ph10 123 in various ways, and rooted in a file called index.html, is distributed in
90 ph10 122 doc/html and installed in <prefix>/share/doc/pcre/html.
91 ph10 406
92 ph10 401 Users of PCRE have contributed files containing the documentation for various
93     releases in CHM format. These can be found in the Contrib directory of the FTP
94     site (see next section).
95 nigel 75
96    
97 nigel 53 Contributions by users of PCRE
98     ------------------------------
99    
100     You can find contributions from PCRE users in the directory
101    
102     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
103    
104 ph10 122 There is a README file giving brief descriptions of what they are. Some are
105     complete in themselves; others are pointers to URLs containing relevant files.
106 ph10 128 Some of this material is likely to be well out-of-date. Several of the earlier
107     contributions provided support for compiling PCRE on various flavours of
108     Windows (I myself do not use Windows). Nowadays there is more Windows support
109     in the standard distribution, so these contibutions have been archived.
110 nigel 53
111    
112 ph10 109 Building PCRE on non-Unix systems
113     ---------------------------------
114 ph10 101
115 ph10 122 For a non-Unix system, please read the comments in the file NON-UNIX-USE,
116     though if your system supports the use of "configure" and "make" you may be
117 ph10 260 able to build PCRE in the same way as for Unix-like systems. PCRE can also be
118 ph10 436 configured in many platform environments using the GUI facility provided by
119     CMake's cmake-gui command. This creates Makefiles, solution files, etc.
120 ph10 101
121 ph10 109 PCRE has been compiled on many different operating systems. It should be
122     straightforward to build PCRE on any system that has a Standard C compiler and
123     library, because it uses only Standard C functions.
124 ph10 101
125    
126 ph10 122 Building PCRE on Unix-like systems
127     ----------------------------------
128 nigel 3
129 nigel 87 If you are using HP's ANSI C++ compiler (aCC), please see the special note
130     in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
131    
132 ph10 145 The following instructions assume the use of the widely used "configure, make,
133 ph10 317 make install" process. There is also support for CMake in the PCRE
134     distribution; there are some comments about using CMake in the NON-UNIX-USE
135     file, though it can also be used in Unix-like systems.
136 ph10 144
137 nigel 63 To build PCRE on a Unix-like system, first run the "configure" command from the
138     PCRE distribution directory, with your current directory set to the directory
139     where you want the files to be created. This command is a standard GNU
140     "autoconf" configuration script, for which generic instructions are supplied in
141 ph10 122 the file INSTALL.
142 nigel 3
143 nigel 53 Most commonly, people build PCRE within its own distribution directory, and in
144 ph10 109 this case, on many systems, just running "./configure" is sufficient. However,
145     the usual methods of changing standard defaults are available. For example:
146 nigel 53
147 nigel 41 CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
148    
149 ph10 840 This command specifies that the C compiler should be run with the flags '-O2
150     -Wall' instead of the default, and that "make install" should install PCRE
151     under /opt/local instead of the default /usr/local.
152 nigel 41
153 nigel 53 If you want to build in a different directory, just run "configure" with that
154     directory as current. For example, suppose you have unpacked the PCRE source
155     into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
156    
157     cd /build/pcre/pcre-xxx
158     /source/pcre/pcre-xxx/configure
159    
160 nigel 87 PCRE is written in C and is normally compiled as a C library. However, it is
161     possible to build it as a C++ library, though the provided building apparatus
162     does not have any features to support this.
163    
164 nigel 63 There are some optional features that can be included or omitted from the PCRE
165 ph10 654 library. They are also documented in the pcrebuild man page.
166 nigel 49
167 ph10 654 . By default, both shared and static libraries are built. You can change this
168     by adding one of these options to the "configure" command:
169    
170     --disable-shared
171     --disable-static
172    
173     (See also "Shared libraries on Unix-like systems" below.)
174 ph10 842
175     . By default, only the 8-bit library is built. If you add --enable-pcre16 to
176     the "configure" command, the 16-bit library is also built. If you want only
177 ph10 840 the 16-bit library, use "./configure --enable-pcre16 --disable-pcre8".
178 ph10 654
179 ph10 842 . If you are building the 8-bit library and want to suppress the building of
180 ph10 840 the C++ wrapper library, you can add --disable-cpp to the "configure"
181     command. Otherwise, when "configure" is run without --disable-pcre8, it will
182     try to find a C++ compiler and C++ header files, and if it succeeds, it will
183     try to build the C++ wrapper.
184 ph10 691
185     . If you want to include support for just-in-time compiling, which can give
186     large performance improvements on certain platforms, add --enable-jit to the
187     "configure" command. This support is available only for certain hardware
188     architectures. If you try to enable it on an unsupported architecture, there
189 ph10 678 will be a compile time error.
190 ph10 691
191 ph10 685 . When JIT support is enabled, pcregrep automatically makes use of it, unless
192 ph10 691 you add --disable-pcregrep-jit to the "configure" command.
193 nigel 83
194 ph10 391 . If you want to make use of the support for UTF-8 Unicode character strings in
195 ph10 840 the 8-bit library, or UTF-16 Unicode character strings in the 16-bit library,
196     you must add --enable-utf to the "configure" command. Without it, the code
197     for handling UTF-8 and UTF-16 is not included in the relevant library. Even
198     when --enable-utf included, the use of UTF encoding still has to be enabled
199     by an option at run time. When PCRE is compiled with this option, its input
200     can only either be ASCII or UTF-8/16, even when running on EBCDIC platforms.
201     It is not possible to use both --enable-utf and --enable-ebcdic at the same
202     time.
203 nigel 63
204 ph10 842 . The option --enable-utf8 is retained for backwards compatibility with earlier
205     releases that did not support 16-bit character strings. It is synonymous with
206     --enable-utf. It is not possible to configure one library with UTF support
207     and the other without in the same configuration.
208    
209     . If, in addition to support for UTF-8/16 character strings, you want to
210 ph10 840 include support for the \P, \p, and \X sequences that recognize Unicode
211     character properties, you must add --enable-unicode-properties to the
212     "configure" command. This adds about 30K to the size of the library (in the
213     form of a property table); only the basic two-letter properties such as Lu
214     are supported.
215 nigel 75
216 nigel 93 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
217 ph10 149 of the preceding, or any of the Unicode newline sequences as indicating the
218     end of a line. Whatever you specify at build time is the default; the caller
219     of PCRE can change the selection at run time. The default newline indicator
220     is a single LF character (the Unix standard). You can specify the default
221     newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
222     or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
223     --enable-newline-is-any to the "configure" command, respectively.
224 ph10 109
225 ph10 149 If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
226     the standard tests will fail, because the lines in the test files end with
227     LF. Even if the files are edited to change the line endings, there are likely
228     to be some failures. With --enable-newline-is-anycrlf or
229     --enable-newline-is-any, many tests should succeed, but there may be some
230     failures.
231 ph10 254
232     . By default, the sequence \R in a pattern matches any Unicode line ending
233     sequence. This is independent of the option specifying what PCRE considers to
234 ph10 251 be the end of a line (see above). However, the caller of PCRE can restrict \R
235     to match only CR, LF, or CRLF. You can make this the default by adding
236     --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
237 nigel 63
238     . When called via the POSIX interface, PCRE uses malloc() to get additional
239     storage for processing capturing parentheses if there are more than 10 of
240 ph10 128 them in a pattern. You can increase this threshold by setting, for example,
241 nigel 63
242     --with-posix-malloc-threshold=20
243    
244     on the "configure" command.
245    
246 nigel 77 . PCRE has a counter that can be set to limit the amount of resources it uses.
247 nigel 63 If the limit is exceeded during a match, the match fails. The default is ten
248     million. You can change the default by setting, for example,
249    
250     --with-match-limit=500000
251    
252     on the "configure" command. This is just the default; individual calls to
253 ph10 122 pcre_exec() can supply their own value. There is more discussion on the
254     pcreapi man page.
255 nigel 63
256 nigel 91 . There is a separate counter that limits the depth of recursive function calls
257     during a matching process. This also has a default of ten million, which is
258     essentially "unlimited". You can change the default by setting, for example,
259    
260     --with-match-limit-recursion=500000
261    
262     Recursive function calls use up the runtime stack; running out of stack can
263     cause programs to crash in strange ways. There is a discussion about stack
264     sizes in the pcrestack man page.
265    
266 nigel 63 . The default maximum compiled pattern size is around 64K. You can increase
267 ph10 842 this by adding --with-link-size=3 to the "configure" command. In the 8-bit
268     library, PCRE then uses three bytes instead of two for offsets to different
269 ph10 840 parts of the compiled pattern. In the 16-bit library, --with-link-size=3 is
270 ph10 842 the same as --with-link-size=4, which (in both libraries) uses four-byte
271 ph10 840 offsets. Increasing the internal link size reduces performance.
272 nigel 63
273 nigel 77 . You can build PCRE so that its internal match() function that is called from
274 ph10 122 pcre_exec() does not call itself recursively. Instead, it uses memory blocks
275     obtained from the heap via the special functions pcre_stack_malloc() and
276     pcre_stack_free() to save data that would otherwise be saved on the stack. To
277     build PCRE like this, use
278 nigel 73
279     --disable-stack-for-recursion
280    
281     on the "configure" command. PCRE runs more slowly in this mode, but it may be
282 nigel 77 necessary in environments with limited stack sizes. This applies only to the
283 ph10 672 normal execution of the pcre_exec() function; if JIT support is being
284     successfully used, it is not relevant. Equally, it does not apply to
285     pcre_dfa_exec(), which does not use deeply nested recursion. There is a
286     discussion about stack sizes in the pcrestack man page.
287 nigel 73
288 ph10 128 . For speed, PCRE uses four tables for manipulating and identifying characters
289     whose code point values are less than 256. By default, it uses a set of
290     tables for ASCII encoding that is part of the distribution. If you specify
291    
292     --enable-rebuild-chartables
293    
294     a program called dftables is compiled and run in the default C locale when
295     you obey "make". It builds a source file called pcre_chartables.c. If you do
296     not specify this option, pcre_chartables.c is created as a copy of
297     pcre_chartables.c.dist. See "Character tables" below for further information.
298    
299     . It is possible to compile PCRE for use on systems that use EBCDIC as their
300 ph10 391 character code (as opposed to ASCII) by specifying
301 ph10 128
302     --enable-ebcdic
303    
304 ph10 392 This automatically implies --enable-rebuild-chartables (see above). However,
305     when PCRE is built this way, it always operates in EBCDIC. It cannot support
306 ph10 840 both EBCDIC and UTF-8/16.
307 ph10 128
308 ph10 842 . The pcregrep program currently supports only 8-bit data files, and so
309 ph10 840 requires the 8-bit PCRE library. It is possible to compile pcregrep to use
310     libz and/or libbz2, in order to read .gz and .bz2 files (respectively), by
311     specifying one or both of
312 ph10 286
313     --enable-pcregrep-libz
314     --enable-pcregrep-libbz2
315 ph10 289
316 ph10 287 Of course, the relevant libraries must be installed on your system.
317 ph10 289
318 ph10 654 . The default size of internal buffer used by pcregrep can be set by, for
319     example:
320    
321     --with-pcregrep-bufsize=50K
322    
323     The default value is 20K.
324    
325 ph10 289 . It is possible to compile pcretest so that it links with the libreadline
326 ph10 287 library, by specifying
327 ph10 289
328     --enable-pcretest-libreadline
329    
330 ph10 287 If this is done, when pcretest's input is from a terminal, it reads it using
331     the readline() function. This provides line-editing and history facilities.
332     Note that libreadline is GPL-licenced, so if you distribute a binary of
333     pcretest linked in this way, there may be licensing issues.
334 ph10 345
335     Setting this option causes the -lreadline option to be added to the pcretest
336 ph10 338 build. In many operating environments with a sytem-installed readline
337     library this is sufficient. However, in some environments (e.g. if an
338     unmodified distribution version of readline is in use), it may be necessary
339     to specify something like LIBS="-lncurses" as well. This is because, to quote
340     the readline INSTALL, "Readline uses the termcap functions, but does not link
341     with the termcap or curses library itself, allowing applications which link
342 ph10 392 with readline the to choose an appropriate library." If you get error
343     messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
344     this is the problem, and linking with the ncurses library should fix it.
345 ph10 286
346 ph10 109 The "configure" script builds the following files for the basic C library:
347 nigel 49
348 ph10 672 . Makefile the makefile that builds the library
349     . config.h build-time configuration options for the library
350     . pcre.h the public PCRE header file
351     . pcre-config script that shows the building settings such as CFLAGS
352     that were set for "configure"
353     . libpcre.pc ) data for the pkg-config command
354 ph10 840 . libpcre16.pc )
355 ph10 672 . libpcreposix.pc )
356     . libtool script that builds shared and/or static libraries
357     . RunTest script for running tests on the basic C library
358     . RunGrepTest script for running tests on the pcregrep command
359 nigel 41
360 ph10 489 Versions of config.h and pcre.h are distributed in the PCRE tarballs under the
361     names config.h.generic and pcre.h.generic. These are provided for those who
362     have to built PCRE without using "configure" or CMake. If you use "configure"
363     or CMake, the .generic versions are not used.
364 nigel 77
365 ph10 840 When building the 8-bit library, if a C++ compiler is found, the following
366     files are also built:
367 ph10 109
368 ph10 672 . libpcrecpp.pc data for the pkg-config command
369     . pcrecpparg.h header file for calling PCRE via the C++ wrapper
370     . pcre_stringpiece.h header for the C++ "stringpiece" functions
371 nigel 77
372     The "configure" script also creates config.status, which is an executable
373     script that can be run to recreate the configuration, and config.log, which
374     contains compiler output from tests that "configure" runs.
375    
376 ph10 840 Once "configure" has run, you can run "make". This builds either or both of the
377     libraries libpcre and libpcre16, and a test program called pcretest. If you
378     enabled JIT support with --enable-jit, a test program called pcre_jit_test is
379     built as well.
380 nigel 3
381 ph10 840 If the 8-bit library is built, libpcreposix and the pcregrep command are also
382     built, and if a C++ compiler was found on your system, and you did not disable
383     it with --disable-cpp, "make" builds the C++ wrapper library, which is called
384     libpcrecpp, as well as some test programs called pcrecpp_unittest,
385     pcre_scanner_unittest, and pcre_stringpiece_unittest.
386    
387 ph10 109 The command "make check" runs all the appropriate tests. Details of the PCRE
388     tests are given below in a separate section of this document.
389 nigel 75
390 ph10 109 You can use "make install" to install PCRE into live directories on your
391     system. The following are installed (file names are all relative to the
392     <prefix> that is set when "configure" is run):
393 nigel 77
394 ph10 109 Commands (bin):
395     pcretest
396 ph10 840 pcregrep (if 8-bit support is enabled)
397 ph10 111 pcre-config
398 ph10 109
399     Libraries (lib):
400 ph10 842 libpcre16 (if 16-bit support is enabled)
401 ph10 840 libpcre (if 8-bit support is enabled)
402     libpcreposix (if 8-bit support is enabled)
403     libpcrecpp (if 8-bit and C++ support is enabled)
404 ph10 109
405     Configuration information (lib/pkgconfig):
406 ph10 842 libpcre16.pc
407 ph10 109 libpcre.pc
408 ph10 672 libpcreposix.pc
409 ph10 122 libpcrecpp.pc (if C++ support is enabled)
410 ph10 109
411     Header files (include):
412     pcre.h
413     pcreposix.h
414     pcre_scanner.h )
415     pcre_stringpiece.h ) if C++ support is enabled
416     pcrecpp.h )
417     pcrecpparg.h )
418    
419     Man pages (share/man/man{1,3}):
420     pcregrep.1
421     pcretest.1
422 ph10 691 pcre-config.1
423 ph10 109 pcre.3
424     pcre*.3 (lots more pages, all starting "pcre")
425    
426     HTML documentation (share/doc/pcre/html):
427     index.html
428     *.html (lots more pages, hyperlinked from index.html)
429    
430     Text file documentation (share/doc/pcre):
431     AUTHORS
432     COPYING
433     ChangeLog
434     LICENCE
435     NEWS
436     README
437 ph10 672 pcre.txt (a concatenation of the man(3) pages)
438     pcretest.txt the pcretest man page
439     pcregrep.txt the pcregrep man page
440 ph10 691 pcre-config.txt the pcre-config man page
441 ph10 109
442 nigel 77 If you want to remove PCRE from your system, you can run "make uninstall".
443     This removes all the files that "make install" installed. However, it does not
444     remove any directories, because these are often shared with other programs.
445    
446    
447 ph10 122 Retrieving configuration information on Unix-like systems
448     ---------------------------------------------------------
449 nigel 75
450 ph10 109 Running "make install" installs the command pcre-config, which can be used to
451     recall information about the PCRE configuration and installation. For example:
452 nigel 37
453 nigel 43 pcre-config --version
454    
455     prints the version number, and
456    
457 nigel 75 pcre-config --libs
458 nigel 43
459     outputs information about where the library is installed. This command can be
460     included in makefiles for programs that use PCRE, saving the programmer from
461     having to remember too many details.
462    
463 nigel 75 The pkg-config command is another system for saving and retrieving information
464     about installed libraries. Instead of separate commands for each library, a
465     single command is used. For example:
466 nigel 43
467 nigel 75 pkg-config --cflags pcre
468    
469     The data is held in *.pc files that are installed in a directory called
470 ph10 109 <prefix>/lib/pkgconfig.
471 nigel 75
472    
473 nigel 63 Shared libraries on Unix-like systems
474     -------------------------------------
475 nigel 53
476 nigel 77 The default distribution builds PCRE as shared libraries and static libraries,
477     as long as the operating system supports shared libraries. Shared library
478     support relies on the "libtool" script which is built as part of the
479 nigel 53 "configure" process.
480 nigel 39
481 nigel 53 The libtool script is used to compile and link both shared and static
482     libraries. They are placed in a subdirectory called .libs when they are newly
483     built. The programs pcretest and pcregrep are built to use these uninstalled
484     libraries (by means of wrapper scripts in the case of shared libraries). When
485     you use "make install" to install shared libraries, pcregrep and pcretest are
486     automatically re-built to use the newly installed shared libraries before being
487 ph10 122 installed themselves. However, the versions left in the build directory still
488 nigel 53 use the uninstalled libraries.
489    
490     To build PCRE using static libraries only you must use --disable-shared when
491 nigel 75 configuring it. For example:
492 nigel 3
493 nigel 43 ./configure --prefix=/usr/gnu --disable-shared
494 nigel 41
495 nigel 53 Then run "make" in the usual way. Similarly, you can use --disable-static to
496     build only shared libraries.
497 nigel 41
498 nigel 43
499 ph10 122 Cross-compiling on Unix-like systems
500     ------------------------------------
501 nigel 63
502     You can specify CC and CFLAGS in the normal way to the "configure" command, in
503 ph10 128 order to cross-compile PCRE for some other host. However, you should NOT
504     specify --enable-rebuild-chartables, because if you do, the dftables.c source
505     file is compiled and run on the local host, in order to generate the inbuilt
506     character tables (the pcre_chartables.c file). This will probably not work,
507     because dftables.c needs to be compiled with the local compiler, not the cross
508     compiler.
509 nigel 63
510 ph10 128 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
511     by making a copy of pcre_chartables.c.dist, which is a default set of tables
512     that assumes ASCII code. Cross-compiling with the default tables should not be
513     a problem.
514 nigel 63
515 ph10 128 If you need to modify the character tables when cross-compiling, you should
516     move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
517     run it on the local host to make a new version of pcre_chartables.c.dist.
518     Then when you cross-compile PCRE this new version of the tables will be used.
519    
520    
521 nigel 87 Using HP's ANSI C++ compiler (aCC)
522     ----------------------------------
523    
524 nigel 93 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
525 ph10 122 "configure" script, you must include the "-AA" option in the CXXFLAGS
526 nigel 87 environment variable in order for the C++ components to compile correctly.
527    
528     Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
529     needed libraries fail to get included when specifying the "-AA" compiler
530     option. If you experience unresolved symbols when linking the C++ programs,
531     use the workaround of specifying the following environment variable prior to
532     running the "configure" script:
533    
534     CXXLDFLAGS="-lstd_v2 -lCsup_v2"
535    
536 ph10 461
537 ph10 469 Using Sun's compilers for Solaris
538     ---------------------------------
539    
540     A user reports that the following configurations work on Solaris 9 sparcv9 and
541     Solaris 9 x86 (32-bit):
542    
543     Solaris 9 sparcv9: ./configure --disable-cpp CC=/bin/cc CFLAGS="-m64 -g"
544     Solaris 9 x86: ./configure --disable-cpp CC=/bin/cc CFLAGS="-g"
545    
546    
547 ph10 452 Using PCRE from MySQL
548     ---------------------
549 ph10 123
550 ph10 461 On systems where both PCRE and MySQL are installed, it is possible to make use
551     of PCRE from within MySQL, as an alternative to the built-in pattern matching.
552 ph10 452 There is a web page that tells you how to do this:
553    
554 ph10 461 http://www.mysqludf.org/lib_mysqludf_preg/index.php
555 ph10 452
556    
557 ph10 111 Making new tarballs
558     -------------------
559 nigel 87
560 ph10 123 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
561 ph10 155 zip formats. The command "make distcheck" does the same, but then does a trial
562     build of the new distribution to ensure that it works.
563 ph10 111
564 ph10 155 If you have modified any of the man page sources in the doc directory, you
565     should first run the PrepareRelease script before making a distribution. This
566     script creates the .txt and HTML forms of the documentation from the man pages.
567 ph10 111
568 ph10 155
569 nigel 41 Testing PCRE
570     ------------
571    
572 ph10 122 To test the basic PCRE library on a Unix system, run the RunTest script that is
573     created by the configuring process. There is also a script called RunGrepTest
574     that tests the options of the pcregrep command. If the C++ wrapper library is
575     built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
576 ph10 691 pcre_stringpiece_unittest are also built. When JIT support is enabled, another
577 ph10 672 test program called pcre_jit_test is built.
578 nigel 41
579 ph10 109 Both the scripts and all the program tests are run if you obey "make check" or
580     "make test". For other systems, see the instructions in NON-UNIX-USE.
581 nigel 77
582     The RunTest script runs the pcretest test program (which is documented in its
583 ph10 672 own man page) on each of the relevant testinput files in the testdata
584     directory, and compares the output with the contents of the corresponding
585     testoutput files. Some tests are relevant only when certain build-time options
586 ph10 840 were selected. For example, the tests for UTF-8/16 support are run only if
587     --enable-utf was used. RunTest outputs a comment when it skips a test.
588 ph10 672
589 ph10 691 Many of the tests that are not skipped are run up to three times. The second
590     run forces pcre_study() to be called for all patterns except for a few in some
591     tests that are marked "never study" (see the pcretest program for how this is
592     done). If JIT support is available, the non-DFA tests are run a third time,
593 ph10 672 this time with a forced pcre_study() with the PCRE_STUDY_JIT_COMPILE option.
594    
595 ph10 842 When both 8-bit and 16-bit support is enabled, the entire set of tests is run
596     twice, once for each library. If you want to run just one set of tests, call
597 ph10 840 RunTest with either the -8 or -16 option.
598    
599 ph10 842 RunTest uses a file called testtry to hold the main output from pcretest.
600     Other files whose names begin with "test" are used as working files in some
601     tests. To run pcretest on just one or more specific test files, give their
602     numbers as arguments to RunTest, for example:
603 nigel 41
604 ph10 840 RunTest 2 7 11
605 ph10 842
606 ph10 672 The first test file can be fed directly into the perltest.pl script to check
607     that Perl gives the same results. The only difference you should see is in the
608     first few lines, where the Perl version is given instead of the PCRE version.
609 nigel 3
610 ph10 840 The second set of tests check pcre_fullinfo(), pcre_study(),
611 nigel 49 pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
612     detection, and run-time flags that are specific to PCRE, as well as the POSIX
613 ph10 122 wrapper API. It also uses the debugging flags to check some of the internals of
614 nigel 49 pcre_compile().
615 nigel 7
616 nigel 49 If you build PCRE with a locale setting that is not the standard C locale, the
617     character tables may be different (see next paragraph). In some cases, this may
618     cause failures in the second set of tests. For example, in a locale where the
619     isprint() function yields TRUE for characters in the range 128-255, the use of
620     [:isascii:] inside a character class defines a different set of characters, and
621     this shows up in this test as a difference in the compiled code, which is being
622     listed for checking. Where the comparison test output contains [\x00-\x7f] the
623     test will contain [\x00-\xff], and similarly in some other cases. This is not a
624     bug in PCRE.
625    
626 nigel 63 The third set of tests checks pcre_maketables(), the facility for building a
627 nigel 25 set of character tables for a specific locale and using them instead of the
628 nigel 73 default tables. The tests make use of the "fr_FR" (French) locale. Before
629     running the test, the script checks for the presence of this locale by running
630     the "locale" command. If that command fails, or if it doesn't include "fr_FR"
631     in the list of available locales, the third test cannot be run, and a comment
632     is output to say why. If running this test produces instances of the error
633 nigel 25
634 nigel 73 ** Failed to set locale "fr_FR"
635 nigel 25
636     in the comparison output, it means that locale is not available on your system,
637     despite being listed by "locale". This does not mean that PCRE is broken.
638    
639 ph10 142 [If you are trying to run this test on Windows, you may be able to get it to
640 ph10 260 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
641     RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
642     Windows versions of test 2. More info on using RunTest.bat is included in the
643     document entitled NON-UNIX-USE.]
644 ph10 139
645 ph10 840 The fourth and fifth tests check the UTF-8/16 support and error handling and
646     internal UTF features of PCRE that are not relevant to Perl, respectively. The
647     sixth and seventh tests do the same for Unicode character properties support.
648 nigel 3
649 ph10 840 The eighth, ninth, and tenth tests check the pcre_dfa_exec() alternative
650     matching function, in non-UTF-8/16 mode, UTF-8/16 mode, and UTF-8/16 mode with
651     Unicode property support, respectively.
652 nigel 3
653 ph10 840 The eleventh test checks some internal offsets and code size features; it is
654     run only when the default "link size" of 2 is set (in other cases the sizes
655 ph10 672 change) and when Unicode property support is enabled.
656 nigel 77
657 ph10 840 The twelfth test is run only when JIT support is available, and the thirteenth
658     test is run only when JIT support is not available. They test some JIT-specific
659     features such as information output from pcretest about JIT compilation.
660 ph10 461
661 ph10 842 The fourteenth, fifteenth, and sixteenth tests are run only in 8-bit mode, and
662     the seventeenth, eighteenth, and nineteenth tests are run only in 16-bit mode.
663     These are tests that generate different output in the two modes. They are for
664 ph10 840 general cases, UTF-8/16 support, and Unicode property support, respectively.
665 ph10 461
666 ph10 842 The twentieth test is run only in 16-bit mode. It tests some specific 16-bit
667 ph10 840 features of the DFA matching engine.
668 ph10 672
669    
670 nigel 3 Character tables
671     ----------------
672    
673 ph10 122 For speed, PCRE uses four tables for manipulating and identifying characters
674     whose code point values are less than 256. The final argument of the
675     pcre_compile() function is a pointer to a block of memory containing the
676     concatenated tables. A call to pcre_maketables() can be used to generate a set
677     of tables in the current locale. If the final argument for pcre_compile() is
678     passed as NULL, a set of default tables that is built into the binary is used.
679 nigel 3
680 ph10 128 The source file called pcre_chartables.c contains the default set of tables. By
681     default, this is created as a copy of pcre_chartables.c.dist, which contains
682     tables for ASCII coding. However, if --enable-rebuild-chartables is specified
683     for ./configure, a different version of pcre_chartables.c is built by the
684     program dftables (compiled from dftables.c), which uses the ANSI C character
685     handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
686     build the table sources. This means that the default C locale which is set for
687     your system will control the contents of these default tables. You can change
688     the default tables by editing pcre_chartables.c and then re-building PCRE. If
689     you do this, you should take care to ensure that the file does not get
690     automatically re-generated. The best way to do this is to move
691     pcre_chartables.c.dist out of the way and replace it with your customized
692     tables.
693 nigel 3
694 ph10 128 When the dftables program is run as a result of --enable-rebuild-chartables,
695     it uses the default C locale that is set on your system. It does not pay
696     attention to the LC_xxx environment variables. In other words, it uses the
697     system's default locale rather than whatever the compiling user happens to have
698     set. If you really do want to build a source set of character tables in a
699     locale that is specified by the LC_xxx variables, you can run the dftables
700     program by hand with the -L option. For example:
701    
702     ./dftables -L pcre_chartables.c.special
703    
704 nigel 25 The first two 256-byte tables provide lower casing and case flipping functions,
705     respectively. The next table consists of three 32-byte bit maps which identify
706     digits, "word" characters, and white space, respectively. These are used when
707 ph10 111 building 32-byte bit maps that represent character classes for code points less
708 ph10 109 than 256.
709 nigel 25
710     The final 256-byte table has bits indicating various character types, as
711 nigel 3 follows:
712    
713     1 white space character
714     2 letter
715     4 decimal digit
716     8 hexadecimal digit
717     16 alphanumeric or '_'
718     128 regular expression metacharacter or binary zero
719    
720     You should not alter the set of characters that contain the 128 bit, as that
721     will cause PCRE to malfunction.
722    
723    
724 ph10 109 File manifest
725     -------------
726 nigel 3
727 ph10 842 The distribution should contain the files listed below. Where a file name is
728     given as pcre[16]_xxx it means that there are two files, one with the name
729 ph10 840 pcre_xxx and the other with the name pcre16_xxx.
730 nigel 3
731 ph10 109 (A) Source files of the PCRE library functions and their headers:
732 nigel 3
733 ph10 128 dftables.c auxiliary program for building pcre_chartables.c
734     when --enable-rebuild-chartables is specified
735 ph10 111
736 ph10 128 pcre_chartables.c.dist a default set of character tables that assume ASCII
737     coding; used, unless --enable-rebuild-chartables is
738 ph10 840 specified, by copying to pcre[16]_chartables.c
739 ph10 111
740 ph10 128 pcreposix.c )
741 ph10 840 pcre[16]_byte_order.c )
742     pcre[16]_compile.c )
743     pcre[16]_config.c )
744     pcre[16]_dfa_exec.c )
745     pcre[16]_exec.c )
746     pcre[16]_fullinfo.c )
747     pcre[16]_get.c ) sources for the functions in the library,
748     pcre[16]_globals.c ) and some internal functions that they use
749     pcre[16]_jit_compile.c )
750     pcre[16]_maketables.c )
751     pcre[16]_newline.c )
752     pcre[16]_refcount.c )
753     pcre[16]_string_utils.c )
754     pcre[16]_study.c )
755     pcre[16]_tables.c )
756     pcre[16]_ucd.c )
757     pcre[16]_version.c )
758     pcre[16]_xclass.c )
759 ph10 128 pcre_ord2utf8.c )
760     pcre_valid_utf8.c )
761 ph10 840 pcre16_ord2utf16.c )
762     pcre16_utf16_utils.c )
763     pcre16_valid_utf16.c )
764 ph10 842
765 ph10 840 pcre[16]_printint.c ) debugging function that is used by pcretest,
766 ph10 128 ) and can also be #included in pcre_compile()
767 ph10 842
768 ph10 128 pcre.h.in template for pcre.h when built by "configure"
769     pcreposix.h header for the external POSIX wrapper API
770     pcre_internal.h header for internal use
771 ph10 691 sljit/* 16 files that make up the JIT compiler
772 ph10 374 ucp.h header for Unicode property handling
773 ph10 111
774 ph10 128 config.h.in template for config.h, which is built by "configure"
775 ph10 111
776 ph10 128 pcrecpp.h public header file for the C++ wrapper
777     pcrecpparg.h.in template for another C++ header file
778     pcre_scanner.h public header file for C++ scanner functions
779     pcrecpp.cc )
780     pcre_scanner.cc ) source for the C++ wrapper library
781 ph10 111
782 ph10 128 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
783     C++ stringpiece functions
784     pcre_stringpiece.cc source for the C++ stringpiece functions
785    
786 ph10 109 (B) Source files for programs that use PCRE:
787 nigel 75
788 ph10 128 pcredemo.c simple demonstration of coding calls to PCRE
789     pcregrep.c source of a grep utility that uses PCRE
790     pcretest.c comprehensive test program
791 ph10 111
792     (C) Auxiliary files:
793    
794 ph10 128 132html script to turn "man" pages into HTML
795     AUTHORS information about the author of PCRE
796     ChangeLog log of changes to the code
797     CleanTxt script to clean nroff output for txt man pages
798     Detrail script to remove trailing spaces
799     HACKING some notes about the internals of PCRE
800     INSTALL generic installation instructions
801     LICENCE conditions for the use of PCRE
802     COPYING the same, using GNU's standard name
803     Makefile.in ) template for Unix Makefile, which is built by
804     ) "configure"
805     Makefile.am ) the automake input that was used to create
806     ) Makefile.in
807     NEWS important changes in this release
808     NON-UNIX-USE notes on building PCRE on non-Unix systems
809     PrepareRelease script to make preparations for "make dist"
810     README this file
811 ph10 138 RunTest a Unix shell script for running tests
812     RunGrepTest a Unix shell script for pcregrep tests
813 ph10 128 aclocal.m4 m4 macros (generated by "aclocal")
814     config.guess ) files used by libtool,
815     config.sub ) used only when building a shared library
816     configure a configuring shell script (built by autoconf)
817     configure.ac ) the autoconf input that was used to build
818     ) "configure" and config.h
819     depcomp ) script to find program dependencies, generated by
820     ) automake
821 ph10 429 doc/*.3 man page sources for PCRE
822 ph10 128 doc/*.1 man page sources for pcregrep and pcretest
823     doc/index.html.src the base HTML page
824     doc/html/* HTML documentation
825     doc/pcre.txt plain text version of the man pages
826     doc/pcretest.txt plain text documentation of test program
827     doc/perltest.txt plain text documentation of Perl test program
828     install-sh a shell script for installing files
829 ph10 840 libpcre16.pc.in template for libpcre16.pc for pkg-config
830 ph10 128 libpcre.pc.in template for libpcre.pc for pkg-config
831 ph10 461 libpcreposix.pc.in template for libpcreposix.pc for pkg-config
832 ph10 128 libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
833     ltmain.sh file used to build a libtool script
834     missing ) common stub for a few missing GNU programs while
835     ) installing, generated by automake
836     mkinstalldirs script for making install directories
837     perltest.pl Perl test program
838     pcre-config.in source of script which retains PCRE information
839 ph10 691 pcre_jit_test.c test program for the JIT compiler
840 ph10 111 pcrecpp_unittest.cc )
841     pcre_scanner_unittest.cc ) test programs for the C++ wrapper
842     pcre_stringpiece_unittest.cc )
843 ph10 128 testdata/testinput* test data for main library tests
844     testdata/testoutput* expected test results
845     testdata/grep* input and output for pcregrep tests
846 ph10 842 testdata/* other supporting test files
847 ph10 111
848 ph10 109 (D) Auxiliary files for cmake support
849 nigel 3
850 ph10 374 cmake/COPYING-CMAKE-SCRIPTS
851     cmake/FindPackageHandleStandardArgs.cmake
852     cmake/FindReadline.cmake
853 ph10 109 CMakeLists.txt
854 ph10 111 config-cmake.h.in
855 nigel 29
856 ph10 109 (E) Auxiliary files for VPASCAL
857 nigel 29
858 nigel 63 makevp.bat
859 ph10 135 makevp_c.txt
860     makevp_l.txt
861 ph10 111 pcregexp.pas
862    
863     (F) Auxiliary files for building PCRE "by hand"
864    
865 ph10 128 pcre.h.generic ) a version of the public PCRE header file
866     ) for use in non-"configure" environments
867     config.h.generic ) a version of config.h for use in non-"configure"
868     ) environments
869 ph10 111
870 ph10 109 (F) Miscellaneous
871 nigel 63
872 ph10 109 RunTest.bat a script for running tests under Windows
873    
874 nigel 77 Philip Hazel
875     Email local part: ph10
876     Email domain: cam.ac.uk
877 ph10 840 Last updated: 30 December 2011

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