/[pcre]/code/trunk/doc/pcrebuild.3
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revision 96 by nigel, Fri Mar 2 13:10:43 2007 UTC revision 149 by ph10, Mon Apr 16 15:28:08 2007 UTC
# Line 13  obtained by running Line 13  obtained by running
13  .sp  .sp
14    ./configure --help    ./configure --help
15  .sp  .sp
16  The following sections describe certain options whose names begin with --enable  The following sections include descriptions of options whose names begin with
17  or --disable. These settings specify changes to the defaults for the  --enable or --disable. These settings specify changes to the defaults for the
18  \fBconfigure\fP command. Because of the way that \fBconfigure\fP works,  \fBconfigure\fP command. Because of the way that \fBconfigure\fP works,
19  --enable and --disable always come in pairs, so the complementary option always  --enable and --disable always come in pairs, so the complementary option always
20  exists as well, but as it specifies the default, it is not described.  exists as well, but as it specifies the default, it is not described.
# Line 56  character properties, you must add Line 56  character properties, you must add
56  to the \fBconfigure\fP command. This implies UTF-8 support, even if you have  to the \fBconfigure\fP command. This implies UTF-8 support, even if you have
57  not explicitly requested it.  not explicitly requested it.
58  .P  .P
59  Including Unicode property support adds around 90K of tables to the PCRE  Including Unicode property support adds around 30K of tables to the PCRE
60  library, approximately doubling its size. Only the general category properties  library. Only the general category properties such as \fILu\fP and \fINd\fP are
61  such as \fILu\fP and \fINd\fP are supported. Details are given in the  supported. Details are given in the
62  .\" HREF  .\" HREF
63  \fBpcrepattern\fP  \fBpcrepattern\fP
64  .\"  .\"
# Line 83  character sequence CRLF. If you want thi Line 83  character sequence CRLF. If you want thi
83  .sp  .sp
84  to the \fBconfigure\fP command. There is a fourth option, specified by  to the \fBconfigure\fP command. There is a fourth option, specified by
85  .sp  .sp
86      --enable-newline-is-anycrlf
87    .sp
88    which causes PCRE to recognize any of the three sequences CR, LF, or CRLF as
89    indicating a line ending. Finally, a fifth option, specified by
90    .sp
91    --enable-newline-is-any    --enable-newline-is-any
92  .sp  .sp
93  which causes PCRE to recognize any Unicode newline sequence.  causes PCRE to recognize any Unicode newline sequence.
94  .P  .P
95  Whatever line ending convention is selected when PCRE is built can be  Whatever line ending convention is selected when PCRE is built can be
96  overridden when the library functions are called. At build time it is  overridden when the library functions are called. At build time it is
# Line 137  or four-byte offsets by adding a setting Line 142  or four-byte offsets by adding a setting
142  to the \fBconfigure\fP command. The value given must be 2, 3, or 4. Using  to the \fBconfigure\fP command. The value given must be 2, 3, or 4. Using
143  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
144  additional bytes when handling them.  additional bytes when handling them.
 .P  
 If you build PCRE with an increased link size, test 2 (and test 5 if you are  
 using UTF-8) will fail. Part of the output of these tests is a representation  
 of the compiled pattern, and this changes with the link size.  
145  .  .
146  .SH "AVOIDING EXCESSIVE STACK USAGE"  .SH "AVOIDING EXCESSIVE STACK USAGE"
147  .rs  .rs
# Line 202  constraints. However, you can set a lowe Line 203  constraints. However, you can set a lowe
203  .sp  .sp
204  to the \fBconfigure\fP command. This value can also be overridden at run time.  to the \fBconfigure\fP command. This value can also be overridden at run time.
205  .  .
206    .SH "CREATING CHARACTER TABLES AT BUILD TIME"
207    .rs
208    .sp
209    PCRE uses fixed tables for processing characters whose code values are less
210    than 256. By default, PCRE is built with a set of tables that are distributed
211    in the file \fIpcre_chartables.c.dist\fP. These tables are for ASCII codes
212    only. If you add
213    .sp
214      --enable-rebuild-chartables
215    .sp
216    to the \fBconfigure\fP command, the distributed tables are no longer used.
217    Instead, a program called \fBdftables\fP is compiled and run. This outputs the
218    source for new set of tables, created in the default locale of your C runtime
219    system. (This method of replacing the tables does not work if you are cross
220    compiling, because \fBdftables\fP is run on the local host. If you need to
221    create alternative tables when cross compiling, you will have to do so "by
222    hand".)
223    .
224  .SH "USING EBCDIC CODE"  .SH "USING EBCDIC CODE"
225  .rs  .rs
226  .sp  .sp
# Line 211  compiled to run in an EBCDIC environment Line 230  compiled to run in an EBCDIC environment
230  .sp  .sp
231    --enable-ebcdic    --enable-ebcdic
232  .sp  .sp
233  to the \fBconfigure\fP command.  to the \fBconfigure\fP command. This setting implies
234    --enable-rebuild-chartables.
235  .  .
236  .  .
237  .SH "SEE ALSO"  .SH "SEE ALSO"
238  .rs  .rs
239  .sp  .sp
240  \fBpcreapi\fP(3), \fBpcre_config\fP(3).  \fBpcreapi\fP(3), \fBpcre_config\fP(3).
241  .P  .
242  .in 0  .
243  Last updated: 30 November 2006  .SH AUTHOR
244  .br  .rs
245  Copyright (c) 1997-2006 University of Cambridge.  .sp
246    .nf
247    Philip Hazel
248    University Computing Service
249    Cambridge CB2 3QH, England.
250    .fi
251    .
252    .
253    .SH REVISION
254    .rs
255    .sp
256    .nf
257    Last updated: 16 April 2007
258    Copyright (c) 1997-2007 University of Cambridge.
259    .fi

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