Annotation of embedaddon/pcre/doc/html/README.txt, revision 1.1.1.2
1.1 misho 1: README file for PCRE (Perl-compatible regular expression library)
2: -----------------------------------------------------------------
3:
4: The latest release of PCRE is always available in three alternative formats
5: from:
6:
7: ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
8: 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:
11: There is a mailing list for discussion about the development of PCRE at
1.1.1.2 ! misho 12: pcre-dev@exim.org. You can access the archives and subscribe or manage your
! 13: subscription here:
1.1 misho 14:
1.1.1.2 ! misho 15: https://lists.exim.org/mailman/listinfo/pcre-dev
1.1 misho 16:
17: Please read the NEWS file if you are upgrading from a previous release.
18: The contents of this README file are:
19:
20: The PCRE APIs
21: Documentation for PCRE
22: Contributions by users of PCRE
23: Building PCRE on non-Unix-like systems
24: Building PCRE without using autotools
25: Building PCRE using autotools
26: Retrieving configuration information
27: Shared libraries
28: Cross-compiling using autotools
29: Using HP's ANSI C++ compiler (aCC)
30: Compiling in Tru64 using native compilers
31: Using Sun's compilers for Solaris
32: Using PCRE from MySQL
33: Making new tarballs
34: Testing PCRE
35: Character tables
36: File manifest
37:
38:
39: The PCRE APIs
40: -------------
41:
42: PCRE is written in C, and it has its own API. There are three sets of
43: functions, one for the 8-bit library, which processes strings of bytes, one for
44: the 16-bit library, which processes strings of 16-bit values, and one for the
45: 32-bit library, which processes strings of 32-bit values. The distribution also
46: includes a set of C++ wrapper functions (see the pcrecpp man page for details),
47: courtesy of Google Inc., which can be used to call the 8-bit PCRE library from
48: C++.
49:
50: In addition, there is a set of C wrapper functions (again, just for the 8-bit
51: library) that are based on the POSIX regular expression API (see the pcreposix
52: man page). These end up in the library called libpcreposix. Note that this just
53: provides a POSIX calling interface to PCRE; the regular expressions themselves
54: still follow Perl syntax and semantics. The POSIX API is restricted, and does
55: not give full access to all of PCRE's facilities.
56:
57: The header file for the POSIX-style functions is called pcreposix.h. The
58: official POSIX name is regex.h, but I did not want to risk possible problems
59: with existing files of that name by distributing it that way. To use PCRE with
60: an existing program that uses the POSIX API, pcreposix.h will have to be
61: renamed or pointed at by a link.
62:
63: If you are using the POSIX interface to PCRE and there is already a POSIX regex
64: library installed on your system, as well as worrying about the regex.h header
65: file (as mentioned above), you must also take care when linking programs to
66: ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
67: up the POSIX functions of the same name from the other library.
68:
69: One way of avoiding this confusion is to compile PCRE with the addition of
70: -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
71: compiler flags (CFLAGS if you are using "configure" -- see below). This has the
72: effect of renaming the functions so that the names no longer clash. Of course,
73: you have to do the same thing for your applications, or write them using the
74: new names.
75:
76:
77: Documentation for PCRE
78: ----------------------
79:
80: If you install PCRE in the normal way on a Unix-like system, you will end up
81: with a set of man pages whose names all start with "pcre". The one that is just
82: called "pcre" lists all the others. In addition to these man pages, the PCRE
83: documentation is supplied in two other forms:
84:
85: 1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
86: doc/pcretest.txt in the source distribution. The first of these is a
87: concatenation of the text forms of all the section 3 man pages except
88: those that summarize individual functions. The other two are the text
89: forms of the section 1 man pages for the pcregrep and pcretest commands.
90: These text forms are provided for ease of scanning with text editors or
91: similar tools. They are installed in <prefix>/share/doc/pcre, where
92: <prefix> is the installation prefix (defaulting to /usr/local).
93:
94: 2. A set of files containing all the documentation in HTML form, hyperlinked
95: in various ways, and rooted in a file called index.html, is distributed in
96: doc/html and installed in <prefix>/share/doc/pcre/html.
97:
98: Users of PCRE have contributed files containing the documentation for various
99: releases in CHM format. These can be found in the Contrib directory of the FTP
100: site (see next section).
101:
102:
103: Contributions by users of PCRE
104: ------------------------------
105:
106: You can find contributions from PCRE users in the directory
107:
108: ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
109:
110: There is a README file giving brief descriptions of what they are. Some are
111: complete in themselves; others are pointers to URLs containing relevant files.
112: Some of this material is likely to be well out-of-date. Several of the earlier
113: contributions provided support for compiling PCRE on various flavours of
114: Windows (I myself do not use Windows). Nowadays there is more Windows support
115: in the standard distribution, so these contibutions have been archived.
116:
1.1.1.2 ! misho 117: A PCRE user maintains downloadable Windows binaries of the pcregrep and
! 118: pcretest programs here:
! 119:
! 120: http://www.rexegg.com/pcregrep-pcretest.html
! 121:
1.1 misho 122:
123: Building PCRE on non-Unix-like systems
124: --------------------------------------
125:
126: For a non-Unix-like system, please read the comments in the file
127: NON-AUTOTOOLS-BUILD, though if your system supports the use of "configure" and
128: "make" you may be able to build PCRE using autotools in the same way as for
129: many Unix-like systems.
130:
131: PCRE can also be configured using the GUI facility provided by CMake's
132: cmake-gui command. This creates Makefiles, solution files, etc. The file
133: NON-AUTOTOOLS-BUILD has information about CMake.
134:
135: PCRE has been compiled on many different operating systems. It should be
136: straightforward to build PCRE on any system that has a Standard C compiler and
137: library, because it uses only Standard C functions.
138:
139:
140: Building PCRE without using autotools
141: -------------------------------------
142:
143: The use of autotools (in particular, libtool) is problematic in some
144: environments, even some that are Unix or Unix-like. See the NON-AUTOTOOLS-BUILD
145: file for ways of building PCRE without using autotools.
146:
147:
148: Building PCRE using autotools
149: -----------------------------
150:
151: If you are using HP's ANSI C++ compiler (aCC), please see the special note
152: in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
153:
154: The following instructions assume the use of the widely used "configure; make;
155: make install" (autotools) process.
156:
157: To build PCRE on system that supports autotools, first run the "configure"
158: command from the PCRE distribution directory, with your current directory set
159: to the directory where you want the files to be created. This command is a
160: standard GNU "autoconf" configuration script, for which generic instructions
161: are supplied in the file INSTALL.
162:
163: Most commonly, people build PCRE within its own distribution directory, and in
164: this case, on many systems, just running "./configure" is sufficient. However,
165: the usual methods of changing standard defaults are available. For example:
166:
167: CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
168:
169: This command specifies that the C compiler should be run with the flags '-O2
170: -Wall' instead of the default, and that "make install" should install PCRE
171: under /opt/local instead of the default /usr/local.
172:
173: If you want to build in a different directory, just run "configure" with that
174: directory as current. For example, suppose you have unpacked the PCRE source
175: into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
176:
177: cd /build/pcre/pcre-xxx
178: /source/pcre/pcre-xxx/configure
179:
180: PCRE is written in C and is normally compiled as a C library. However, it is
181: possible to build it as a C++ library, though the provided building apparatus
182: does not have any features to support this.
183:
184: There are some optional features that can be included or omitted from the PCRE
185: library. They are also documented in the pcrebuild man page.
186:
187: . By default, both shared and static libraries are built. You can change this
188: by adding one of these options to the "configure" command:
189:
190: --disable-shared
191: --disable-static
192:
193: (See also "Shared libraries on Unix-like systems" below.)
194:
195: . By default, only the 8-bit library is built. If you add --enable-pcre16 to
196: the "configure" command, the 16-bit library is also built. If you add
197: --enable-pcre32 to the "configure" command, the 32-bit library is also built.
198: If you want only the 16-bit or 32-bit library, use --disable-pcre8 to disable
199: building the 8-bit library.
200:
201: . If you are building the 8-bit library and want to suppress the building of
202: the C++ wrapper library, you can add --disable-cpp to the "configure"
203: command. Otherwise, when "configure" is run without --disable-pcre8, it will
204: try to find a C++ compiler and C++ header files, and if it succeeds, it will
205: try to build the C++ wrapper.
206:
207: . If you want to include support for just-in-time compiling, which can give
208: large performance improvements on certain platforms, add --enable-jit to the
209: "configure" command. This support is available only for certain hardware
210: architectures. If you try to enable it on an unsupported architecture, there
211: will be a compile time error.
212:
213: . When JIT support is enabled, pcregrep automatically makes use of it, unless
214: you add --disable-pcregrep-jit to the "configure" command.
215:
216: . If you want to make use of the support for UTF-8 Unicode character strings in
217: the 8-bit library, or UTF-16 Unicode character strings in the 16-bit library,
218: or UTF-32 Unicode character strings in the 32-bit library, you must add
219: --enable-utf to the "configure" command. Without it, the code for handling
220: UTF-8, UTF-16 and UTF-8 is not included in the relevant library. Even
221: when --enable-utf is included, the use of a UTF encoding still has to be
222: enabled by an option at run time. When PCRE is compiled with this option, its
223: input can only either be ASCII or UTF-8/16/32, even when running on EBCDIC
224: platforms. It is not possible to use both --enable-utf and --enable-ebcdic at
225: the same time.
226:
227: . There are no separate options for enabling UTF-8, UTF-16 and UTF-32
228: independently because that would allow ridiculous settings such as requesting
229: UTF-16 support while building only the 8-bit library. However, the option
230: --enable-utf8 is retained for backwards compatibility with earlier releases
231: that did not support 16-bit or 32-bit character strings. It is synonymous with
232: --enable-utf. It is not possible to configure one library with UTF support
233: and the other without in the same configuration.
234:
235: . If, in addition to support for UTF-8/16/32 character strings, you want to
236: include support for the \P, \p, and \X sequences that recognize Unicode
237: character properties, you must add --enable-unicode-properties to the
238: "configure" command. This adds about 30K to the size of the library (in the
239: form of a property table); only the basic two-letter properties such as Lu
240: are supported.
241:
242: . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
243: of the preceding, or any of the Unicode newline sequences as indicating the
244: end of a line. Whatever you specify at build time is the default; the caller
245: of PCRE can change the selection at run time. The default newline indicator
246: is a single LF character (the Unix standard). You can specify the default
247: newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
248: or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
249: --enable-newline-is-any to the "configure" command, respectively.
250:
251: If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
252: the standard tests will fail, because the lines in the test files end with
253: LF. Even if the files are edited to change the line endings, there are likely
254: to be some failures. With --enable-newline-is-anycrlf or
255: --enable-newline-is-any, many tests should succeed, but there may be some
256: failures.
257:
258: . By default, the sequence \R in a pattern matches any Unicode line ending
259: sequence. This is independent of the option specifying what PCRE considers to
260: be the end of a line (see above). However, the caller of PCRE can restrict \R
261: to match only CR, LF, or CRLF. You can make this the default by adding
262: --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
263:
264: . When called via the POSIX interface, PCRE uses malloc() to get additional
265: storage for processing capturing parentheses if there are more than 10 of
266: them in a pattern. You can increase this threshold by setting, for example,
267:
268: --with-posix-malloc-threshold=20
269:
270: on the "configure" command.
271:
1.1.1.2 ! misho 272: . PCRE has a counter that limits the depth of nesting of parentheses in a
! 273: pattern. This limits the amount of system stack that a pattern uses when it
! 274: is compiled. The default is 250, but you can change it by setting, for
! 275: example,
! 276:
! 277: --with-parens-nest-limit=500
! 278:
! 279: . PCRE has a counter that can be set to limit the amount of resources it uses
! 280: when matching a pattern. If the limit is exceeded during a match, the match
! 281: fails. The default is ten million. You can change the default by setting, for
! 282: example,
1.1 misho 283:
284: --with-match-limit=500000
285:
286: on the "configure" command. This is just the default; individual calls to
287: pcre_exec() can supply their own value. There is more discussion on the
288: pcreapi man page.
289:
290: . There is a separate counter that limits the depth of recursive function calls
291: during a matching process. This also has a default of ten million, which is
292: essentially "unlimited". You can change the default by setting, for example,
293:
294: --with-match-limit-recursion=500000
295:
296: Recursive function calls use up the runtime stack; running out of stack can
297: cause programs to crash in strange ways. There is a discussion about stack
298: sizes in the pcrestack man page.
299:
300: . The default maximum compiled pattern size is around 64K. You can increase
301: this by adding --with-link-size=3 to the "configure" command. In the 8-bit
302: library, PCRE then uses three bytes instead of two for offsets to different
303: parts of the compiled pattern. In the 16-bit library, --with-link-size=3 is
304: the same as --with-link-size=4, which (in both libraries) uses four-byte
305: offsets. Increasing the internal link size reduces performance. In the 32-bit
306: library, the only supported link size is 4.
307:
308: . You can build PCRE so that its internal match() function that is called from
309: pcre_exec() does not call itself recursively. Instead, it uses memory blocks
310: obtained from the heap via the special functions pcre_stack_malloc() and
311: pcre_stack_free() to save data that would otherwise be saved on the stack. To
312: build PCRE like this, use
313:
314: --disable-stack-for-recursion
315:
316: on the "configure" command. PCRE runs more slowly in this mode, but it may be
317: necessary in environments with limited stack sizes. This applies only to the
318: normal execution of the pcre_exec() function; if JIT support is being
319: successfully used, it is not relevant. Equally, it does not apply to
320: pcre_dfa_exec(), which does not use deeply nested recursion. There is a
321: discussion about stack sizes in the pcrestack man page.
322:
323: . For speed, PCRE uses four tables for manipulating and identifying characters
324: whose code point values are less than 256. By default, it uses a set of
325: tables for ASCII encoding that is part of the distribution. If you specify
326:
327: --enable-rebuild-chartables
328:
329: a program called dftables is compiled and run in the default C locale when
330: you obey "make". It builds a source file called pcre_chartables.c. If you do
331: not specify this option, pcre_chartables.c is created as a copy of
332: pcre_chartables.c.dist. See "Character tables" below for further information.
333:
334: . It is possible to compile PCRE for use on systems that use EBCDIC as their
335: character code (as opposed to ASCII/Unicode) by specifying
336:
337: --enable-ebcdic
338:
339: This automatically implies --enable-rebuild-chartables (see above). However,
340: when PCRE is built this way, it always operates in EBCDIC. It cannot support
341: both EBCDIC and UTF-8/16/32. There is a second option, --enable-ebcdic-nl25,
342: which specifies that the code value for the EBCDIC NL character is 0x25
343: instead of the default 0x15.
344:
345: . In environments where valgrind is installed, if you specify
346:
347: --enable-valgrind
348:
349: PCRE will use valgrind annotations to mark certain memory regions as
350: unaddressable. This allows it to detect invalid memory accesses, and is
351: mostly useful for debugging PCRE itself.
352:
353: . In environments where the gcc compiler is used and lcov version 1.6 or above
354: is installed, if you specify
355:
356: --enable-coverage
357:
358: the build process implements a code coverage report for the test suite. The
359: report is generated by running "make coverage". If ccache is installed on
360: your system, it must be disabled when building PCRE for coverage reporting.
361: You can do this by setting the environment variable CCACHE_DISABLE=1 before
1.1.1.2 ! misho 362: running "make" to build PCRE. There is more information about coverage
! 363: reporting in the "pcrebuild" documentation.
1.1 misho 364:
365: . The pcregrep program currently supports only 8-bit data files, and so
366: requires the 8-bit PCRE library. It is possible to compile pcregrep to use
367: libz and/or libbz2, in order to read .gz and .bz2 files (respectively), by
368: specifying one or both of
369:
370: --enable-pcregrep-libz
371: --enable-pcregrep-libbz2
372:
373: Of course, the relevant libraries must be installed on your system.
374:
375: . The default size of internal buffer used by pcregrep can be set by, for
376: example:
377:
378: --with-pcregrep-bufsize=50K
379:
380: The default value is 20K.
381:
382: . It is possible to compile pcretest so that it links with the libreadline
383: or libedit libraries, by specifying, respectively,
384:
385: --enable-pcretest-libreadline or --enable-pcretest-libedit
386:
387: If this is done, when pcretest's input is from a terminal, it reads it using
388: the readline() function. This provides line-editing and history facilities.
389: Note that libreadline is GPL-licenced, so if you distribute a binary of
390: pcretest linked in this way, there may be licensing issues. These can be
391: avoided by linking with libedit (which has a BSD licence) instead.
392:
393: Enabling libreadline causes the -lreadline option to be added to the pcretest
394: build. In many operating environments with a sytem-installed readline
395: library this is sufficient. However, in some environments (e.g. if an
396: unmodified distribution version of readline is in use), it may be necessary
397: to specify something like LIBS="-lncurses" as well. This is because, to quote
398: the readline INSTALL, "Readline uses the termcap functions, but does not link
399: with the termcap or curses library itself, allowing applications which link
400: with readline the to choose an appropriate library." If you get error
401: messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
402: this is the problem, and linking with the ncurses library should fix it.
403:
404: The "configure" script builds the following files for the basic C library:
405:
406: . Makefile the makefile that builds the library
407: . config.h build-time configuration options for the library
408: . pcre.h the public PCRE header file
409: . pcre-config script that shows the building settings such as CFLAGS
410: that were set for "configure"
411: . libpcre.pc ) data for the pkg-config command
412: . libpcre16.pc )
413: . libpcre32.pc )
414: . libpcreposix.pc )
415: . libtool script that builds shared and/or static libraries
416:
417: Versions of config.h and pcre.h are distributed in the PCRE tarballs under the
418: names config.h.generic and pcre.h.generic. These are provided for those who
419: have to built PCRE without using "configure" or CMake. If you use "configure"
420: or CMake, the .generic versions are not used.
421:
422: When building the 8-bit library, if a C++ compiler is found, the following
423: files are also built:
424:
425: . libpcrecpp.pc data for the pkg-config command
426: . pcrecpparg.h header file for calling PCRE via the C++ wrapper
427: . pcre_stringpiece.h header for the C++ "stringpiece" functions
428:
429: The "configure" script also creates config.status, which is an executable
430: script that can be run to recreate the configuration, and config.log, which
431: contains compiler output from tests that "configure" runs.
432:
433: Once "configure" has run, you can run "make". This builds the the libraries
434: libpcre, libpcre16 and/or libpcre32, and a test program called pcretest. If you
435: enabled JIT support with --enable-jit, a test program called pcre_jit_test is
436: built as well.
437:
438: If the 8-bit library is built, libpcreposix and the pcregrep command are also
439: built, and if a C++ compiler was found on your system, and you did not disable
440: it with --disable-cpp, "make" builds the C++ wrapper library, which is called
441: libpcrecpp, as well as some test programs called pcrecpp_unittest,
442: pcre_scanner_unittest, and pcre_stringpiece_unittest.
443:
444: The command "make check" runs all the appropriate tests. Details of the PCRE
445: tests are given below in a separate section of this document.
446:
447: You can use "make install" to install PCRE into live directories on your
448: system. The following are installed (file names are all relative to the
449: <prefix> that is set when "configure" is run):
450:
451: Commands (bin):
452: pcretest
453: pcregrep (if 8-bit support is enabled)
454: pcre-config
455:
456: Libraries (lib):
457: libpcre16 (if 16-bit support is enabled)
458: libpcre32 (if 32-bit support is enabled)
459: libpcre (if 8-bit support is enabled)
460: libpcreposix (if 8-bit support is enabled)
461: libpcrecpp (if 8-bit and C++ support is enabled)
462:
463: Configuration information (lib/pkgconfig):
464: libpcre16.pc
465: libpcre32.pc
466: libpcre.pc
467: libpcreposix.pc
468: libpcrecpp.pc (if C++ support is enabled)
469:
470: Header files (include):
471: pcre.h
472: pcreposix.h
473: pcre_scanner.h )
474: pcre_stringpiece.h ) if C++ support is enabled
475: pcrecpp.h )
476: pcrecpparg.h )
477:
478: Man pages (share/man/man{1,3}):
479: pcregrep.1
480: pcretest.1
481: pcre-config.1
482: pcre.3
483: pcre*.3 (lots more pages, all starting "pcre")
484:
485: HTML documentation (share/doc/pcre/html):
486: index.html
487: *.html (lots more pages, hyperlinked from index.html)
488:
489: Text file documentation (share/doc/pcre):
490: AUTHORS
491: COPYING
492: ChangeLog
493: LICENCE
494: NEWS
495: README
496: pcre.txt (a concatenation of the man(3) pages)
497: pcretest.txt the pcretest man page
498: pcregrep.txt the pcregrep man page
499: pcre-config.txt the pcre-config man page
500:
501: If you want to remove PCRE from your system, you can run "make uninstall".
502: This removes all the files that "make install" installed. However, it does not
503: remove any directories, because these are often shared with other programs.
504:
505:
506: Retrieving configuration information
507: ------------------------------------
508:
509: Running "make install" installs the command pcre-config, which can be used to
510: recall information about the PCRE configuration and installation. For example:
511:
512: pcre-config --version
513:
514: prints the version number, and
515:
516: pcre-config --libs
517:
518: outputs information about where the library is installed. This command can be
519: included in makefiles for programs that use PCRE, saving the programmer from
520: having to remember too many details.
521:
522: The pkg-config command is another system for saving and retrieving information
523: about installed libraries. Instead of separate commands for each library, a
524: single command is used. For example:
525:
526: pkg-config --cflags pcre
527:
528: The data is held in *.pc files that are installed in a directory called
529: <prefix>/lib/pkgconfig.
530:
531:
532: Shared libraries
533: ----------------
534:
535: The default distribution builds PCRE as shared libraries and static libraries,
536: as long as the operating system supports shared libraries. Shared library
537: support relies on the "libtool" script which is built as part of the
538: "configure" process.
539:
540: The libtool script is used to compile and link both shared and static
541: libraries. They are placed in a subdirectory called .libs when they are newly
542: built. The programs pcretest and pcregrep are built to use these uninstalled
543: libraries (by means of wrapper scripts in the case of shared libraries). When
544: you use "make install" to install shared libraries, pcregrep and pcretest are
545: automatically re-built to use the newly installed shared libraries before being
546: installed themselves. However, the versions left in the build directory still
547: use the uninstalled libraries.
548:
549: To build PCRE using static libraries only you must use --disable-shared when
550: configuring it. For example:
551:
552: ./configure --prefix=/usr/gnu --disable-shared
553:
554: Then run "make" in the usual way. Similarly, you can use --disable-static to
555: build only shared libraries.
556:
557:
558: Cross-compiling using autotools
559: -------------------------------
560:
561: You can specify CC and CFLAGS in the normal way to the "configure" command, in
562: order to cross-compile PCRE for some other host. However, you should NOT
563: specify --enable-rebuild-chartables, because if you do, the dftables.c source
564: file is compiled and run on the local host, in order to generate the inbuilt
565: character tables (the pcre_chartables.c file). This will probably not work,
566: because dftables.c needs to be compiled with the local compiler, not the cross
567: compiler.
568:
569: When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
570: by making a copy of pcre_chartables.c.dist, which is a default set of tables
571: that assumes ASCII code. Cross-compiling with the default tables should not be
572: a problem.
573:
574: If you need to modify the character tables when cross-compiling, you should
575: move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
576: run it on the local host to make a new version of pcre_chartables.c.dist.
577: Then when you cross-compile PCRE this new version of the tables will be used.
578:
579:
580: Using HP's ANSI C++ compiler (aCC)
581: ----------------------------------
582:
583: Unless C++ support is disabled by specifying the "--disable-cpp" option of the
584: "configure" script, you must include the "-AA" option in the CXXFLAGS
585: environment variable in order for the C++ components to compile correctly.
586:
587: Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
588: needed libraries fail to get included when specifying the "-AA" compiler
589: option. If you experience unresolved symbols when linking the C++ programs,
590: use the workaround of specifying the following environment variable prior to
591: running the "configure" script:
592:
593: CXXLDFLAGS="-lstd_v2 -lCsup_v2"
594:
595:
596: Compiling in Tru64 using native compilers
597: -----------------------------------------
598:
599: The following error may occur when compiling with native compilers in the Tru64
600: operating system:
601:
602: CXX libpcrecpp_la-pcrecpp.lo
603: cxx: Error: /usr/lib/cmplrs/cxx/V7.1-006/include/cxx/iosfwd, line 58: #error
604: directive: "cannot include iosfwd -- define __USE_STD_IOSTREAM to
605: override default - see section 7.1.2 of the C++ Using Guide"
606: #error "cannot include iosfwd -- define __USE_STD_IOSTREAM to override default
607: - see section 7.1.2 of the C++ Using Guide"
608:
609: This may be followed by other errors, complaining that 'namespace "std" has no
610: member'. The solution to this is to add the line
611:
612: #define __USE_STD_IOSTREAM 1
613:
614: to the config.h file.
615:
616:
617: Using Sun's compilers for Solaris
618: ---------------------------------
619:
620: A user reports that the following configurations work on Solaris 9 sparcv9 and
621: Solaris 9 x86 (32-bit):
622:
623: Solaris 9 sparcv9: ./configure --disable-cpp CC=/bin/cc CFLAGS="-m64 -g"
624: Solaris 9 x86: ./configure --disable-cpp CC=/bin/cc CFLAGS="-g"
625:
626:
627: Using PCRE from MySQL
628: ---------------------
629:
630: On systems where both PCRE and MySQL are installed, it is possible to make use
631: of PCRE from within MySQL, as an alternative to the built-in pattern matching.
632: There is a web page that tells you how to do this:
633:
634: http://www.mysqludf.org/lib_mysqludf_preg/index.php
635:
636:
637: Making new tarballs
638: -------------------
639:
640: The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
641: zip formats. The command "make distcheck" does the same, but then does a trial
642: build of the new distribution to ensure that it works.
643:
644: If you have modified any of the man page sources in the doc directory, you
645: should first run the PrepareRelease script before making a distribution. This
646: script creates the .txt and HTML forms of the documentation from the man pages.
647:
648:
649: Testing PCRE
650: ------------
651:
652: To test the basic PCRE library on a Unix-like system, run the RunTest script.
653: There is another script called RunGrepTest that tests the options of the
654: pcregrep command. If the C++ wrapper library is built, three test programs
655: called pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest
656: are also built. When JIT support is enabled, another test program called
657: pcre_jit_test is built.
658:
659: Both the scripts and all the program tests are run if you obey "make check" or
660: "make test". For other environments, see the instructions in
661: NON-AUTOTOOLS-BUILD.
662:
663: The RunTest script runs the pcretest test program (which is documented in its
664: own man page) on each of the relevant testinput files in the testdata
665: directory, and compares the output with the contents of the corresponding
666: testoutput files. RunTest uses a file called testtry to hold the main output
667: from pcretest. Other files whose names begin with "test" are used as working
668: files in some tests.
669:
670: Some tests are relevant only when certain build-time options were selected. For
671: example, the tests for UTF-8/16/32 support are run only if --enable-utf was
672: used. RunTest outputs a comment when it skips a test.
673:
674: Many of the tests that are not skipped are run up to three times. The second
675: run forces pcre_study() to be called for all patterns except for a few in some
676: tests that are marked "never study" (see the pcretest program for how this is
677: done). If JIT support is available, the non-DFA tests are run a third time,
678: this time with a forced pcre_study() with the PCRE_STUDY_JIT_COMPILE option.
679: This testing can be suppressed by putting "nojit" on the RunTest command line.
680:
681: The entire set of tests is run once for each of the 8-bit, 16-bit and 32-bit
682: libraries that are enabled. If you want to run just one set of tests, call
683: RunTest with either the -8, -16 or -32 option.
684:
685: If valgrind is installed, you can run the tests under it by putting "valgrind"
686: on the RunTest command line. To run pcretest on just one or more specific test
687: files, give their numbers as arguments to RunTest, for example:
688:
689: RunTest 2 7 11
690:
691: You can also specify ranges of tests such as 3-6 or 3- (meaning 3 to the
692: end), or a number preceded by ~ to exclude a test. For example:
693:
694: Runtest 3-15 ~10
695:
696: This runs tests 3 to 15, excluding test 10, and just ~13 runs all the tests
697: except test 13. Whatever order the arguments are in, the tests are always run
698: in numerical order.
699:
700: You can also call RunTest with the single argument "list" to cause it to output
701: a list of tests.
702:
703: The first test file can be fed directly into the perltest.pl script to check
704: that Perl gives the same results. The only difference you should see is in the
705: first few lines, where the Perl version is given instead of the PCRE version.
706:
707: The second set of tests check pcre_fullinfo(), pcre_study(),
708: pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
709: detection, and run-time flags that are specific to PCRE, as well as the POSIX
710: wrapper API. It also uses the debugging flags to check some of the internals of
711: pcre_compile().
712:
713: If you build PCRE with a locale setting that is not the standard C locale, the
714: character tables may be different (see next paragraph). In some cases, this may
715: cause failures in the second set of tests. For example, in a locale where the
716: isprint() function yields TRUE for characters in the range 128-255, the use of
717: [:isascii:] inside a character class defines a different set of characters, and
718: this shows up in this test as a difference in the compiled code, which is being
719: listed for checking. Where the comparison test output contains [\x00-\x7f] the
720: test will contain [\x00-\xff], and similarly in some other cases. This is not a
721: bug in PCRE.
722:
723: The third set of tests checks pcre_maketables(), the facility for building a
724: set of character tables for a specific locale and using them instead of the
725: default tables. The tests make use of the "fr_FR" (French) locale. Before
726: running the test, the script checks for the presence of this locale by running
727: the "locale" command. If that command fails, or if it doesn't include "fr_FR"
728: in the list of available locales, the third test cannot be run, and a comment
729: is output to say why. If running this test produces instances of the error
730:
731: ** Failed to set locale "fr_FR"
732:
733: in the comparison output, it means that locale is not available on your system,
734: despite being listed by "locale". This does not mean that PCRE is broken.
735:
736: [If you are trying to run this test on Windows, you may be able to get it to
737: work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
738: RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
739: Windows versions of test 2. More info on using RunTest.bat is included in the
740: document entitled NON-UNIX-USE.]
741:
742: The fourth and fifth tests check the UTF-8/16/32 support and error handling and
743: internal UTF features of PCRE that are not relevant to Perl, respectively. The
744: sixth and seventh tests do the same for Unicode character properties support.
745:
746: The eighth, ninth, and tenth tests check the pcre_dfa_exec() alternative
747: matching function, in non-UTF-8/16/32 mode, UTF-8/16/32 mode, and UTF-8/16/32
748: mode with Unicode property support, respectively.
749:
750: The eleventh test checks some internal offsets and code size features; it is
751: run only when the default "link size" of 2 is set (in other cases the sizes
752: change) and when Unicode property support is enabled.
753:
754: The twelfth test is run only when JIT support is available, and the thirteenth
755: test is run only when JIT support is not available. They test some JIT-specific
756: features such as information output from pcretest about JIT compilation.
757:
758: The fourteenth, fifteenth, and sixteenth tests are run only in 8-bit mode, and
759: the seventeenth, eighteenth, and nineteenth tests are run only in 16/32-bit
760: mode. These are tests that generate different output in the two modes. They are
761: for general cases, UTF-8/16/32 support, and Unicode property support,
762: respectively.
763:
764: The twentieth test is run only in 16/32-bit mode. It tests some specific
765: 16/32-bit features of the DFA matching engine.
766:
767: The twenty-first and twenty-second tests are run only in 16/32-bit mode, when
768: the link size is set to 2 for the 16-bit library. They test reloading
769: pre-compiled patterns.
770:
771: The twenty-third and twenty-fourth tests are run only in 16-bit mode. They are
772: for general cases, and UTF-16 support, respectively.
773:
774: The twenty-fifth and twenty-sixth tests are run only in 32-bit mode. They are
775: for general cases, and UTF-32 support, respectively.
776:
777:
778: Character tables
779: ----------------
780:
781: For speed, PCRE uses four tables for manipulating and identifying characters
782: whose code point values are less than 256. The final argument of the
783: pcre_compile() function is a pointer to a block of memory containing the
784: concatenated tables. A call to pcre_maketables() can be used to generate a set
785: of tables in the current locale. If the final argument for pcre_compile() is
786: passed as NULL, a set of default tables that is built into the binary is used.
787:
788: The source file called pcre_chartables.c contains the default set of tables. By
789: default, this is created as a copy of pcre_chartables.c.dist, which contains
790: tables for ASCII coding. However, if --enable-rebuild-chartables is specified
791: for ./configure, a different version of pcre_chartables.c is built by the
792: program dftables (compiled from dftables.c), which uses the ANSI C character
793: handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
794: build the table sources. This means that the default C locale which is set for
795: your system will control the contents of these default tables. You can change
796: the default tables by editing pcre_chartables.c and then re-building PCRE. If
797: you do this, you should take care to ensure that the file does not get
798: automatically re-generated. The best way to do this is to move
799: pcre_chartables.c.dist out of the way and replace it with your customized
800: tables.
801:
802: When the dftables program is run as a result of --enable-rebuild-chartables,
803: it uses the default C locale that is set on your system. It does not pay
804: attention to the LC_xxx environment variables. In other words, it uses the
805: system's default locale rather than whatever the compiling user happens to have
806: set. If you really do want to build a source set of character tables in a
807: locale that is specified by the LC_xxx variables, you can run the dftables
808: program by hand with the -L option. For example:
809:
810: ./dftables -L pcre_chartables.c.special
811:
812: The first two 256-byte tables provide lower casing and case flipping functions,
813: respectively. The next table consists of three 32-byte bit maps which identify
814: digits, "word" characters, and white space, respectively. These are used when
815: building 32-byte bit maps that represent character classes for code points less
816: than 256.
817:
818: The final 256-byte table has bits indicating various character types, as
819: follows:
820:
821: 1 white space character
822: 2 letter
823: 4 decimal digit
824: 8 hexadecimal digit
825: 16 alphanumeric or '_'
826: 128 regular expression metacharacter or binary zero
827:
828: You should not alter the set of characters that contain the 128 bit, as that
829: will cause PCRE to malfunction.
830:
831:
832: File manifest
833: -------------
834:
835: The distribution should contain the files listed below. Where a file name is
836: given as pcre[16|32]_xxx it means that there are three files, one with the name
837: pcre_xxx, one with the name pcre16_xx, and a third with the name pcre32_xxx.
838:
839: (A) Source files of the PCRE library functions and their headers:
840:
841: dftables.c auxiliary program for building pcre_chartables.c
842: when --enable-rebuild-chartables is specified
843:
844: pcre_chartables.c.dist a default set of character tables that assume ASCII
845: coding; used, unless --enable-rebuild-chartables is
846: specified, by copying to pcre[16]_chartables.c
847:
848: pcreposix.c )
849: pcre[16|32]_byte_order.c )
850: pcre[16|32]_compile.c )
851: pcre[16|32]_config.c )
852: pcre[16|32]_dfa_exec.c )
853: pcre[16|32]_exec.c )
854: pcre[16|32]_fullinfo.c )
855: pcre[16|32]_get.c ) sources for the functions in the library,
856: pcre[16|32]_globals.c ) and some internal functions that they use
857: pcre[16|32]_jit_compile.c )
858: pcre[16|32]_maketables.c )
859: pcre[16|32]_newline.c )
860: pcre[16|32]_refcount.c )
861: pcre[16|32]_string_utils.c )
862: pcre[16|32]_study.c )
863: pcre[16|32]_tables.c )
864: pcre[16|32]_ucd.c )
865: pcre[16|32]_version.c )
866: pcre[16|32]_xclass.c )
867: pcre_ord2utf8.c )
868: pcre_valid_utf8.c )
869: pcre16_ord2utf16.c )
870: pcre16_utf16_utils.c )
871: pcre16_valid_utf16.c )
872: pcre32_utf32_utils.c )
873: pcre32_valid_utf32.c )
874:
875: pcre[16|32]_printint.c ) debugging function that is used by pcretest,
876: ) and can also be #included in pcre_compile()
877:
878: pcre.h.in template for pcre.h when built by "configure"
879: pcreposix.h header for the external POSIX wrapper API
880: pcre_internal.h header for internal use
881: sljit/* 16 files that make up the JIT compiler
882: ucp.h header for Unicode property handling
883:
884: config.h.in template for config.h, which is built by "configure"
885:
886: pcrecpp.h public header file for the C++ wrapper
887: pcrecpparg.h.in template for another C++ header file
888: pcre_scanner.h public header file for C++ scanner functions
889: pcrecpp.cc )
890: pcre_scanner.cc ) source for the C++ wrapper library
891:
892: pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
893: C++ stringpiece functions
894: pcre_stringpiece.cc source for the C++ stringpiece functions
895:
896: (B) Source files for programs that use PCRE:
897:
898: pcredemo.c simple demonstration of coding calls to PCRE
899: pcregrep.c source of a grep utility that uses PCRE
900: pcretest.c comprehensive test program
901:
902: (C) Auxiliary files:
903:
904: 132html script to turn "man" pages into HTML
905: AUTHORS information about the author of PCRE
906: ChangeLog log of changes to the code
907: CleanTxt script to clean nroff output for txt man pages
908: Detrail script to remove trailing spaces
909: HACKING some notes about the internals of PCRE
910: INSTALL generic installation instructions
911: LICENCE conditions for the use of PCRE
912: COPYING the same, using GNU's standard name
913: Makefile.in ) template for Unix Makefile, which is built by
914: ) "configure"
915: Makefile.am ) the automake input that was used to create
916: ) Makefile.in
917: NEWS important changes in this release
918: NON-UNIX-USE the previous name for NON-AUTOTOOLS-BUILD
919: NON-AUTOTOOLS-BUILD notes on building PCRE without using autotools
920: PrepareRelease script to make preparations for "make dist"
921: README this file
922: RunTest a Unix shell script for running tests
923: RunGrepTest a Unix shell script for pcregrep tests
924: aclocal.m4 m4 macros (generated by "aclocal")
925: config.guess ) files used by libtool,
926: config.sub ) used only when building a shared library
927: configure a configuring shell script (built by autoconf)
928: configure.ac ) the autoconf input that was used to build
929: ) "configure" and config.h
930: depcomp ) script to find program dependencies, generated by
931: ) automake
932: doc/*.3 man page sources for PCRE
933: doc/*.1 man page sources for pcregrep and pcretest
934: doc/index.html.src the base HTML page
935: doc/html/* HTML documentation
936: doc/pcre.txt plain text version of the man pages
937: doc/pcretest.txt plain text documentation of test program
938: doc/perltest.txt plain text documentation of Perl test program
939: install-sh a shell script for installing files
940: libpcre16.pc.in template for libpcre16.pc for pkg-config
941: libpcre32.pc.in template for libpcre32.pc for pkg-config
942: libpcre.pc.in template for libpcre.pc for pkg-config
943: libpcreposix.pc.in template for libpcreposix.pc for pkg-config
944: libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
945: ltmain.sh file used to build a libtool script
946: missing ) common stub for a few missing GNU programs while
947: ) installing, generated by automake
948: mkinstalldirs script for making install directories
949: perltest.pl Perl test program
950: pcre-config.in source of script which retains PCRE information
951: pcre_jit_test.c test program for the JIT compiler
952: pcrecpp_unittest.cc )
953: pcre_scanner_unittest.cc ) test programs for the C++ wrapper
954: pcre_stringpiece_unittest.cc )
955: testdata/testinput* test data for main library tests
956: testdata/testoutput* expected test results
957: testdata/grep* input and output for pcregrep tests
958: testdata/* other supporting test files
959:
960: (D) Auxiliary files for cmake support
961:
962: cmake/COPYING-CMAKE-SCRIPTS
963: cmake/FindPackageHandleStandardArgs.cmake
964: cmake/FindEditline.cmake
965: cmake/FindReadline.cmake
966: CMakeLists.txt
967: config-cmake.h.in
968:
969: (E) Auxiliary files for VPASCAL
970:
971: makevp.bat
972: makevp_c.txt
973: makevp_l.txt
974: pcregexp.pas
975:
976: (F) Auxiliary files for building PCRE "by hand"
977:
978: pcre.h.generic ) a version of the public PCRE header file
979: ) for use in non-"configure" environments
980: config.h.generic ) a version of config.h for use in non-"configure"
981: ) environments
982:
983: (F) Miscellaneous
984:
985: RunTest.bat a script for running tests under Windows
986:
987: Philip Hazel
988: Email local part: ph10
989: Email domain: cam.ac.uk
1.1.1.2 ! misho 990: Last updated: 05 November 2013
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