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revision 182 by ph10, Wed Jun 13 15:09:54 2007 UTC revision 345 by ph10, Mon Apr 28 15:10:02 2008 UTC
# Line 18  man page, in case the conversion went wr Line 18  man page, in case the conversion went wr
18  <li><a name="TOC3" href="#SEC3">UTF-8 SUPPORT</a>  <li><a name="TOC3" href="#SEC3">UTF-8 SUPPORT</a>
19  <li><a name="TOC4" href="#SEC4">UNICODE CHARACTER PROPERTY SUPPORT</a>  <li><a name="TOC4" href="#SEC4">UNICODE CHARACTER PROPERTY SUPPORT</a>
20  <li><a name="TOC5" href="#SEC5">CODE VALUE OF NEWLINE</a>  <li><a name="TOC5" href="#SEC5">CODE VALUE OF NEWLINE</a>
21  <li><a name="TOC6" href="#SEC6">BUILDING SHARED AND STATIC LIBRARIES</a>  <li><a name="TOC6" href="#SEC6">WHAT \R MATCHES</a>
22  <li><a name="TOC7" href="#SEC7">POSIX MALLOC USAGE</a>  <li><a name="TOC7" href="#SEC7">BUILDING SHARED AND STATIC LIBRARIES</a>
23  <li><a name="TOC8" href="#SEC8">HANDLING VERY LARGE PATTERNS</a>  <li><a name="TOC8" href="#SEC8">POSIX MALLOC USAGE</a>
24  <li><a name="TOC9" href="#SEC9">AVOIDING EXCESSIVE STACK USAGE</a>  <li><a name="TOC9" href="#SEC9">HANDLING VERY LARGE PATTERNS</a>
25  <li><a name="TOC10" href="#SEC10">LIMITING PCRE RESOURCE USAGE</a>  <li><a name="TOC10" href="#SEC10">AVOIDING EXCESSIVE STACK USAGE</a>
26  <li><a name="TOC11" href="#SEC11">CREATING CHARACTER TABLES AT BUILD TIME</a>  <li><a name="TOC11" href="#SEC11">LIMITING PCRE RESOURCE USAGE</a>
27  <li><a name="TOC12" href="#SEC12">USING EBCDIC CODE</a>  <li><a name="TOC12" href="#SEC12">CREATING CHARACTER TABLES AT BUILD TIME</a>
28  <li><a name="TOC13" href="#SEC13">SEE ALSO</a>  <li><a name="TOC13" href="#SEC13">USING EBCDIC CODE</a>
29  <li><a name="TOC14" href="#SEC14">AUTHOR</a>  <li><a name="TOC14" href="#SEC14">PCREGREP OPTIONS FOR COMPRESSED FILE SUPPORT</a>
30  <li><a name="TOC15" href="#SEC15">REVISION</a>  <li><a name="TOC15" href="#SEC15">PCRETEST OPTION FOR LIBREADLINE SUPPORT</a>
31    <li><a name="TOC16" href="#SEC16">SEE ALSO</a>
32    <li><a name="TOC17" href="#SEC17">AUTHOR</a>
33    <li><a name="TOC18" href="#SEC18">REVISION</a>
34  </ul>  </ul>
35  <br><a name="SEC1" href="#TOC1">PCRE BUILD-TIME OPTIONS</a><br>  <br><a name="SEC1" href="#TOC1">PCRE BUILD-TIME OPTIONS</a><br>
36  <P>  <P>
37  This document describes the optional features of PCRE that can be selected when  This document describes the optional features of PCRE that can be selected when
38  the library is compiled. They are all selected, or deselected, by providing  the library is compiled. It assumes use of the <b>configure</b> script, where
39  options to the <b>configure</b> script that is run before the <b>make</b>  the optional features are selected or deselected by providing options to
40  command. The complete list of options for <b>configure</b> (which includes the  <b>configure</b> before running the <b>make</b> command. However, the same
41  standard ones such as the selection of the installation directory) can be  options can be selected in both Unix-like and non-Unix-like environments using
42  obtained by running  the GUI facility of <b>CMakeSetup</b> if you are using <b>CMake</b> instead of
43    <b>configure</b> to build PCRE.
44    </P>
45    <P>
46    The complete list of options for <b>configure</b> (which includes the standard
47    ones such as the selection of the installation directory) can be obtained by
48    running
49  <pre>  <pre>
50    ./configure --help    ./configure --help
51  </pre>  </pre>
# Line 120  Whatever line ending convention is selec Line 129  Whatever line ending convention is selec
129  overridden when the library functions are called. At build time it is  overridden when the library functions are called. At build time it is
130  conventional to use the standard for your operating system.  conventional to use the standard for your operating system.
131  </P>  </P>
132  <br><a name="SEC6" href="#TOC1">BUILDING SHARED AND STATIC LIBRARIES</a><br>  <br><a name="SEC6" href="#TOC1">WHAT \R MATCHES</a><br>
133    <P>
134    By default, the sequence \R in a pattern matches any Unicode newline sequence,
135    whatever has been selected as the line ending sequence. If you specify
136    <pre>
137      --enable-bsr-anycrlf
138    </pre>
139    the default is changed so that \R matches only CR, LF, or CRLF. Whatever is
140    selected when PCRE is built can be overridden when the library functions are
141    called.
142    </P>
143    <br><a name="SEC7" href="#TOC1">BUILDING SHARED AND STATIC LIBRARIES</a><br>
144  <P>  <P>
145  The PCRE building process uses <b>libtool</b> to build both shared and static  The PCRE building process uses <b>libtool</b> to build both shared and static
146  Unix libraries by default. You can suppress one of these by adding one of  Unix libraries by default. You can suppress one of these by adding one of
# Line 130  Unix libraries by default. You can suppr Line 150  Unix libraries by default. You can suppr
150  </pre>  </pre>
151  to the <b>configure</b> command, as required.  to the <b>configure</b> command, as required.
152  </P>  </P>
153  <br><a name="SEC7" href="#TOC1">POSIX MALLOC USAGE</a><br>  <br><a name="SEC8" href="#TOC1">POSIX MALLOC USAGE</a><br>
154  <P>  <P>
155  When PCRE is called through the POSIX interface (see the  When PCRE is called through the POSIX interface (see the
156  <a href="pcreposix.html"><b>pcreposix</b></a>  <a href="pcreposix.html"><b>pcreposix</b></a>
# Line 146  such as Line 166  such as
166  </pre>  </pre>
167  to the <b>configure</b> command.  to the <b>configure</b> command.
168  </P>  </P>
169  <br><a name="SEC8" href="#TOC1">HANDLING VERY LARGE PATTERNS</a><br>  <br><a name="SEC9" href="#TOC1">HANDLING VERY LARGE PATTERNS</a><br>
170  <P>  <P>
171  Within a compiled pattern, offset values are used to point from one part to  Within a compiled pattern, offset values are used to point from one part to
172  another (for example, from an opening parenthesis to an alternation  another (for example, from an opening parenthesis to an alternation
# Line 162  to the configure command. The val Line 182  to the configure command. The val
182  longer offsets slows down the operation of PCRE because it has to load  longer offsets slows down the operation of PCRE because it has to load
183  additional bytes when handling them.  additional bytes when handling them.
184  </P>  </P>
185  <br><a name="SEC9" href="#TOC1">AVOIDING EXCESSIVE STACK USAGE</a><br>  <br><a name="SEC10" href="#TOC1">AVOIDING EXCESSIVE STACK USAGE</a><br>
186  <P>  <P>
187  When matching with the <b>pcre_exec()</b> function, PCRE implements backtracking  When matching with the <b>pcre_exec()</b> function, PCRE implements backtracking
188  by making recursive calls to an internal function called <b>match()</b>. In  by making recursive calls to an internal function called <b>match()</b>. In
# Line 193  perform better than malloc() and Line 213  perform better than malloc() and
213  slowly when built in this way. This option affects only the <b>pcre_exec()</b>  slowly when built in this way. This option affects only the <b>pcre_exec()</b>
214  function; it is not relevant for the the <b>pcre_dfa_exec()</b> function.  function; it is not relevant for the the <b>pcre_dfa_exec()</b> function.
215  </P>  </P>
216  <br><a name="SEC10" href="#TOC1">LIMITING PCRE RESOURCE USAGE</a><br>  <br><a name="SEC11" href="#TOC1">LIMITING PCRE RESOURCE USAGE</a><br>
217  <P>  <P>
218  Internally, PCRE has a function called <b>match()</b>, which it calls repeatedly  Internally, PCRE has a function called <b>match()</b>, which it calls repeatedly
219  (sometimes recursively) when matching a pattern with the <b>pcre_exec()</b>  (sometimes recursively) when matching a pattern with the <b>pcre_exec()</b>
# Line 222  constraints. However, you can set a lowe Line 242  constraints. However, you can set a lowe
242  </pre>  </pre>
243  to the <b>configure</b> command. This value can also be overridden at run time.  to the <b>configure</b> command. This value can also be overridden at run time.
244  </P>  </P>
245  <br><a name="SEC11" href="#TOC1">CREATING CHARACTER TABLES AT BUILD TIME</a><br>  <br><a name="SEC12" href="#TOC1">CREATING CHARACTER TABLES AT BUILD TIME</a><br>
246  <P>  <P>
247  PCRE uses fixed tables for processing characters whose code values are less  PCRE uses fixed tables for processing characters whose code values are less
248  than 256. By default, PCRE is built with a set of tables that are distributed  than 256. By default, PCRE is built with a set of tables that are distributed
# Line 239  compiling, because dftables is ru Line 259  compiling, because dftables is ru
259  create alternative tables when cross compiling, you will have to do so "by  create alternative tables when cross compiling, you will have to do so "by
260  hand".)  hand".)
261  </P>  </P>
262  <br><a name="SEC12" href="#TOC1">USING EBCDIC CODE</a><br>  <br><a name="SEC13" href="#TOC1">USING EBCDIC CODE</a><br>
263  <P>  <P>
264  PCRE assumes by default that it will run in an environment where the character  PCRE assumes by default that it will run in an environment where the character
265  code is ASCII (or Unicode, which is a superset of ASCII). PCRE can, however, be  code is ASCII (or Unicode, which is a superset of ASCII). This is the case for
266  compiled to run in an EBCDIC environment by adding  most computer operating systems. PCRE can, however, be compiled to run in an
267    EBCDIC environment by adding
268  <pre>  <pre>
269    --enable-ebcdic    --enable-ebcdic
270  </pre>  </pre>
271  to the <b>configure</b> command. This setting implies  to the <b>configure</b> command. This setting implies
272  --enable-rebuild-chartables.  --enable-rebuild-chartables. You should only use it if you know that you are in
273    an EBCDIC environment (for example, an IBM mainframe operating system).
274    </P>
275    <br><a name="SEC14" href="#TOC1">PCREGREP OPTIONS FOR COMPRESSED FILE SUPPORT</a><br>
276    <P>
277    By default, <b>pcregrep</b> reads all files as plain text. You can build it so
278    that it recognizes files whose names end in <b>.gz</b> or <b>.bz2</b>, and reads
279    them with <b>libz</b> or <b>libbz2</b>, respectively, by adding one or both of
280    <pre>
281      --enable-pcregrep-libz
282      --enable-pcregrep-libbz2
283    </pre>
284    to the <b>configure</b> command. These options naturally require that the
285    relevant libraries are installed on your system. Configuration will fail if
286    they are not.
287    </P>
288    <br><a name="SEC15" href="#TOC1">PCRETEST OPTION FOR LIBREADLINE SUPPORT</a><br>
289    <P>
290    If you add
291    <pre>
292      --enable-pcretest-libreadline
293    </pre>
294    to the <b>configure</b> command, <b>pcretest</b> is linked with the
295    <b>libreadline</b> library, and when its input is from a terminal, it reads it
296    using the <b>readline()</b> function. This provides line-editing and history
297    facilities. Note that <b>libreadline</b> is GPL-licenced, so if you distribute a
298    binary of <b>pcretest</b> linked in this way, there may be licensing issues.
299    </P>
300    <P>
301    Setting this option causes the <b>-lreadline</b> option to be added to the
302    <b>pcretest</b> build. In many operating environments with a sytem-installed
303    <b>libreadline</b> this is sufficient. However, in some environments (e.g.
304    if an unmodified distribution version of readline is in use), some extra
305    configuration may be necessary. The INSTALL file for <b>libreadline</b> says
306    this:
307    <pre>
308      "Readline uses the termcap functions, but does not link with the
309      termcap or curses library itself, allowing applications which link
310      with readline the to choose an appropriate library."
311    </pre>
312    If your environment has not been set up so that an appropriate library is
313    automatically included, you may need to add something like
314    <pre>
315      LIBS="-ncurses"
316    </pre>
317    immediately before the <b>configure</b> command.
318  </P>  </P>
319  <br><a name="SEC13" href="#TOC1">SEE ALSO</a><br>  <br><a name="SEC16" href="#TOC1">SEE ALSO</a><br>
320  <P>  <P>
321  <b>pcreapi</b>(3), <b>pcre_config</b>(3).  <b>pcreapi</b>(3), <b>pcre_config</b>(3).
322  </P>  </P>
323  <br><a name="SEC14" href="#TOC1">AUTHOR</a><br>  <br><a name="SEC17" href="#TOC1">AUTHOR</a><br>
324  <P>  <P>
325  Philip Hazel  Philip Hazel
326  <br>  <br>
# Line 263  University Computing Service Line 329  University Computing Service
329  Cambridge CB2 3QH, England.  Cambridge CB2 3QH, England.
330  <br>  <br>
331  </P>  </P>
332  <br><a name="SEC15" href="#TOC1">REVISION</a><br>  <br><a name="SEC18" href="#TOC1">REVISION</a><br>
333  <P>  <P>
334  Last updated: 05 June 2007  Last updated: 13 April 2008
335  <br>  <br>
336  Copyright &copy; 1997-2007 University of Cambridge.  Copyright &copy; 1997-2008 University of Cambridge.
337  <br>  <br>
338  <p>  <p>
339  Return to the <a href="index.html">PCRE index page</a>.  Return to the <a href="index.html">PCRE index page</a>.

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