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-.TH PCREBUILD 3 "07 January 2012" "PCRE 8.30"
-.SH NAME
-PCRE - Perl-compatible regular expressions
-.
-.
-.SH "PCRE BUILD-TIME OPTIONS"
-.rs
-.sp
-This document describes the optional features of PCRE that can be selected when
-the library is compiled. It assumes use of the \fBconfigure\fP script, where
-the optional features are selected or deselected by providing options to
-\fBconfigure\fP before running the \fBmake\fP command. However, the same
-options can be selected in both Unix-like and non-Unix-like environments using
-the GUI facility of \fBcmake-gui\fP if you are using \fBCMake\fP instead of
-\fBconfigure\fP to build PCRE.
-.P
-There is a lot more information about building PCRE in non-Unix-like
-environments in the file called \fINON_UNIX_USE\fP, which is part of the PCRE
-distribution. You should consult this file as well as the \fIREADME\fP file if
-you are building in a non-Unix-like environment.
-.P
-The complete list of options for \fBconfigure\fP (which includes the standard
-ones such as the selection of the installation directory) can be obtained by
-running
-.sp
-  ./configure --help
-.sp
-The following sections include descriptions of options whose names begin with
---enable or --disable. These settings specify changes to the defaults for the
-\fBconfigure\fP command. Because of the way that \fBconfigure\fP works,
---enable and --disable always come in pairs, so the complementary option always
-exists as well, but as it specifies the default, it is not described.
-.
-.
-.SH "BUILDING 8-BIT and 16-BIT LIBRARIES"
-.rs
-.sp
-By default, a library called \fBlibpcre\fP is built, containing functions that
-take string arguments contained in vectors of bytes, either as single-byte
-characters, or interpreted as UTF-8 strings. You can also build a separate
-library, called \fBlibpcre16\fP, in which strings are contained in vectors of
-16-bit data units and interpreted either as single-unit characters or UTF-16
-strings, by adding
-.sp
-  --enable-pcre16
-.sp
-to the \fBconfigure\fP command. If you do not want the 8-bit library, add
-.sp
-  --disable-pcre8
-.sp
-as well. At least one of the two libraries must be built. Note that the C++ and
-POSIX wrappers are for the 8-bit library only, and that \fBpcregrep\fP is an
-8-bit program. None of these are built if you select only the 16-bit library.
-.
-.
-.SH "BUILDING SHARED AND STATIC LIBRARIES"
-.rs
-.sp
-The PCRE building process uses \fBlibtool\fP to build both shared and static
-Unix libraries by default. You can suppress one of these by adding one of
-.sp
-  --disable-shared
-  --disable-static
-.sp
-to the \fBconfigure\fP command, as required.
-.
-.
-.SH "C++ SUPPORT"
-.rs
-.sp
-By default, if the 8-bit library is being built, the \fBconfigure\fP script
-will search for a C++ compiler and C++ header files. If it finds them, it
-automatically builds the C++ wrapper library (which supports only 8-bit
-strings). You can disable this by adding
-.sp
-  --disable-cpp
-.sp
-to the \fBconfigure\fP command.
-.
-.
-.SH "UTF-8 and UTF-16 SUPPORT"
-.rs
-.sp
-To build PCRE with support for UTF Unicode character strings, add
-.sp
-  --enable-utf
-.sp
-to the \fBconfigure\fP command. This setting applies to both libraries, adding
-support for UTF-8 to the 8-bit library and support for UTF-16 to the 16-bit
-library. There are no separate options for enabling UTF-8 and UTF-16
-independently because that would allow ridiculous settings such as requesting
-UTF-16 support while building only the 8-bit library. It is not possible to
-build one library with UTF support and the other without in the same
-configuration. (For backwards compatibility, --enable-utf8 is a synonym of
---enable-utf.)
-.P
-Of itself, this setting does not make PCRE treat strings as UTF-8 or UTF-16. As
-well as compiling PCRE with this option, you also have have to set the
-PCRE_UTF8 or PCRE_UTF16 option when you call one of the pattern compiling
-functions.
-.P
-If you set --enable-utf when compiling in an EBCDIC environment, PCRE expects
-its input to be either ASCII or UTF-8 (depending on the run-time option). It is
-not possible to support both EBCDIC and UTF-8 codes in the same version of the
-library. Consequently, --enable-utf and --enable-ebcdic are mutually
-exclusive.
-.
-.
-.SH "UNICODE CHARACTER PROPERTY SUPPORT"
-.rs
-.sp
-UTF support allows the libraries to process character codepoints up to 0x10ffff
-in the strings that they handle. On its own, however, it does not provide any
-facilities for accessing the properties of such characters. If you want to be
-able to use the pattern escapes \eP, \ep, and \eX, which refer to Unicode
-character properties, you must add
-.sp
-  --enable-unicode-properties
-.sp
-to the \fBconfigure\fP command. This implies UTF support, even if you have
-not explicitly requested it.
-.P
-Including Unicode property support adds around 30K of tables to the PCRE
-library. Only the general category properties such as \fILu\fP and \fINd\fP are
-supported. Details are given in the
-.\" HREF
-\fBpcrepattern\fP
-.\"
-documentation.
-.
-.
-.SH "JUST-IN-TIME COMPILER SUPPORT"
-.rs
-.sp
-Just-in-time compiler support is included in the build by specifying
-.sp
-  --enable-jit
-.sp
-This support is available only for certain hardware architectures. If this
-option is set for an unsupported architecture, a compile time error occurs.
-See the
-.\" HREF
-\fBpcrejit\fP
-.\"
-documentation for a discussion of JIT usage. When JIT support is enabled,
-pcregrep automatically makes use of it, unless you add
-.sp
-  --disable-pcregrep-jit
-.sp
-to the "configure" command.
-.
-.
-.SH "CODE VALUE OF NEWLINE"
-.rs
-.sp
-By default, PCRE interprets the linefeed (LF) character as indicating the end
-of a line. This is the normal newline character on Unix-like systems. You can
-compile PCRE to use carriage return (CR) instead, by adding
-.sp
-  --enable-newline-is-cr
-.sp
-to the \fBconfigure\fP command. There is also a --enable-newline-is-lf option,
-which explicitly specifies linefeed as the newline character.
-.sp
-Alternatively, you can specify that line endings are to be indicated by the two
-character sequence CRLF. If you want this, add
-.sp
-  --enable-newline-is-crlf
-.sp
-to the \fBconfigure\fP command. There is a fourth option, specified by
-.sp
-  --enable-newline-is-anycrlf
-.sp
-which causes PCRE to recognize any of the three sequences CR, LF, or CRLF as
-indicating a line ending. Finally, a fifth option, specified by
-.sp
-  --enable-newline-is-any
-.sp
-causes PCRE to recognize any Unicode newline sequence.
-.P
-Whatever line ending convention is selected when PCRE is built can be
-overridden when the library functions are called. At build time it is
-conventional to use the standard for your operating system.
-.
-.
-.SH "WHAT \eR MATCHES"
-.rs
-.sp
-By default, the sequence \eR in a pattern matches any Unicode newline sequence,
-whatever has been selected as the line ending sequence. If you specify
-.sp
-  --enable-bsr-anycrlf
-.sp
-the default is changed so that \eR matches only CR, LF, or CRLF. Whatever is
-selected when PCRE is built can be overridden when the library functions are
-called.
-.
-.
-.SH "POSIX MALLOC USAGE"
-.rs
-.sp
-When the 8-bit library is called through the POSIX interface (see the
-.\" HREF
-\fBpcreposix\fP
-.\"
-documentation), additional working storage is required for holding the pointers
-to capturing substrings, because PCRE requires three integers per substring,
-whereas the POSIX interface provides only two. If the number of expected
-substrings is small, the wrapper function uses space on the stack, because this
-is faster than using \fBmalloc()\fP for each call. The default threshold above
-which the stack is no longer used is 10; it can be changed by adding a setting
-such as
-.sp
-  --with-posix-malloc-threshold=20
-.sp
-to the \fBconfigure\fP command.
-.
-.
-.SH "HANDLING VERY LARGE PATTERNS"
-.rs
-.sp
-Within a compiled pattern, offset values are used to point from one part to
-another (for example, from an opening parenthesis to an alternation
-metacharacter). By default, two-byte values are used for these offsets, leading
-to a maximum size for a compiled pattern of around 64K. This is sufficient to
-handle all but the most gigantic patterns. Nevertheless, some people do want to
-process truly enormous patterns, so it is possible to compile PCRE to use
-three-byte or four-byte offsets by adding a setting such as
-.sp
-  --with-link-size=3
-.sp
-to the \fBconfigure\fP command. The value given must be 2, 3, or 4. For the
-16-bit library, a value of 3 is rounded up to 4. Using longer offsets slows
-down the operation of PCRE because it has to load additional data when handling
-them.
-.
-.
-.SH "AVOIDING EXCESSIVE STACK USAGE"
-.rs
-.sp
-When matching with the \fBpcre_exec()\fP function, PCRE implements backtracking
-by making recursive calls to an internal function called \fBmatch()\fP. In
-environments where the size of the stack is limited, this can severely limit
-PCRE's operation. (The Unix environment does not usually suffer from this
-problem, but it may sometimes be necessary to increase the maximum stack size.
-There is a discussion in the
-.\" HREF
-\fBpcrestack\fP
-.\"
-documentation.) An alternative approach to recursion that uses memory from the
-heap to remember data, instead of using recursive function calls, has been
-implemented to work round the problem of limited stack size. If you want to
-build a version of PCRE that works this way, add
-.sp
-  --disable-stack-for-recursion
-.sp
-to the \fBconfigure\fP command. With this configuration, PCRE will use the
-\fBpcre_stack_malloc\fP and \fBpcre_stack_free\fP variables to call memory
-management functions. By default these point to \fBmalloc()\fP and
-\fBfree()\fP, but you can replace the pointers so that your own functions are
-used instead.
-.P
-Separate functions are provided rather than using \fBpcre_malloc\fP and
-\fBpcre_free\fP because the usage is very predictable: the block sizes
-requested are always the same, and the blocks are always freed in reverse
-order. A calling program might be able to implement optimized functions that
-perform better than \fBmalloc()\fP and \fBfree()\fP. PCRE runs noticeably more
-slowly when built in this way. This option affects only the \fBpcre_exec()\fP
-function; it is not relevant for \fBpcre_dfa_exec()\fP.
-.
-.
-.SH "LIMITING PCRE RESOURCE USAGE"
-.rs
-.sp
-Internally, PCRE has a function called \fBmatch()\fP, which it calls repeatedly
-(sometimes recursively) when matching a pattern with the \fBpcre_exec()\fP
-function. By controlling the maximum number of times this function may be
-called during a single matching operation, a limit can be placed on the
-resources used by a single call to \fBpcre_exec()\fP. The limit can be changed
-at run time, as described in the
-.\" HREF
-\fBpcreapi\fP
-.\"
-documentation. The default is 10 million, but this can be changed by adding a
-setting such as
-.sp
-  --with-match-limit=500000
-.sp
-to the \fBconfigure\fP command. This setting has no effect on the
-\fBpcre_dfa_exec()\fP matching function.
-.P
-In some environments it is desirable to limit the depth of recursive calls of
-\fBmatch()\fP more strictly than the total number of calls, in order to
-restrict the maximum amount of stack (or heap, if --disable-stack-for-recursion
-is specified) that is used. A second limit controls this; it defaults to the
-value that is set for --with-match-limit, which imposes no additional
-constraints. However, you can set a lower limit by adding, for example,
-.sp
-  --with-match-limit-recursion=10000
-.sp
-to the \fBconfigure\fP command. This value can also be overridden at run time.
-.
-.
-.SH "CREATING CHARACTER TABLES AT BUILD TIME"
-.rs
-.sp
-PCRE uses fixed tables for processing characters whose code values are less
-than 256. By default, PCRE is built with a set of tables that are distributed
-in the file \fIpcre_chartables.c.dist\fP. These tables are for ASCII codes
-only. If you add
-.sp
-  --enable-rebuild-chartables
-.sp
-to the \fBconfigure\fP command, the distributed tables are no longer used.
-Instead, a program called \fBdftables\fP is compiled and run. This outputs the
-source for new set of tables, created in the default locale of your C run-time
-system. (This method of replacing the tables does not work if you are cross
-compiling, because \fBdftables\fP is run on the local host. If you need to
-create alternative tables when cross compiling, you will have to do so "by
-hand".)
-.
-.
-.SH "USING EBCDIC CODE"
-.rs
-.sp
-PCRE assumes by default that it will run in an environment where the character
-code is ASCII (or Unicode, which is a superset of ASCII). This is the case for
-most computer operating systems. PCRE can, however, be compiled to run in an
-EBCDIC environment by adding
-.sp
-  --enable-ebcdic
-.sp
-to the \fBconfigure\fP command. This setting implies
---enable-rebuild-chartables. You should only use it if you know that you are in
-an EBCDIC environment (for example, an IBM mainframe operating system). The
---enable-ebcdic option is incompatible with --enable-utf.
-.
-.
-.SH "PCREGREP OPTIONS FOR COMPRESSED FILE SUPPORT"
-.rs
-.sp
-By default, \fBpcregrep\fP reads all files as plain text. You can build it so
-that it recognizes files whose names end in \fB.gz\fP or \fB.bz2\fP, and reads
-them with \fBlibz\fP or \fBlibbz2\fP, respectively, by adding one or both of
-.sp
-  --enable-pcregrep-libz
-  --enable-pcregrep-libbz2
-.sp
-to the \fBconfigure\fP command. These options naturally require that the
-relevant libraries are installed on your system. Configuration will fail if
-they are not.
-.
-.
-.SH "PCREGREP BUFFER SIZE"
-.rs
-.sp
-\fBpcregrep\fP uses an internal buffer to hold a "window" on the file it is
-scanning, in order to be able to output "before" and "after" lines when it
-finds a match. The size of the buffer is controlled by a parameter whose
-default value is 20K. The buffer itself is three times this size, but because
-of the way it is used for holding "before" lines, the longest line that is
-guaranteed to be processable is the parameter size. You can change the default
-parameter value by adding, for example,
-.sp
-  --with-pcregrep-bufsize=50K
-.sp
-to the \fBconfigure\fP command. The caller of \fPpcregrep\fP can, however,
-override this value by specifying a run-time option.
-.
-.
-.SH "PCRETEST OPTION FOR LIBREADLINE SUPPORT"
-.rs
-.sp
-If you add
-.sp
-  --enable-pcretest-libreadline
-.sp
-to the \fBconfigure\fP command, \fBpcretest\fP is linked with the
-\fBlibreadline\fP library, and when its input is from a terminal, it reads it
-using the \fBreadline()\fP function. This provides line-editing and history
-facilities. Note that \fBlibreadline\fP is GPL-licensed, so if you distribute a
-binary of \fBpcretest\fP linked in this way, there may be licensing issues.
-.P
-Setting this option causes the \fB-lreadline\fP option to be added to the
-\fBpcretest\fP build. In many operating environments with a sytem-installed
-\fBlibreadline\fP this is sufficient. However, in some environments (e.g.
-if an unmodified distribution version of readline is in use), some extra
-configuration may be necessary. The INSTALL file for \fBlibreadline\fP says
-this:
-.sp
-  "Readline uses the termcap functions, but does not link with the
-  termcap or curses library itself, allowing applications which link
-  with readline the to choose an appropriate library."
-.sp
-If your environment has not been set up so that an appropriate library is
-automatically included, you may need to add something like
-.sp
-  LIBS="-ncurses"
-.sp
-immediately before the \fBconfigure\fP command.
-.
-.
-.SH "SEE ALSO"
-.rs
-.sp
-\fBpcreapi\fP(3), \fBpcre16\fP, \fBpcre_config\fP(3).
-.
-.
-.SH AUTHOR
-.rs
-.sp
-.nf
-Philip Hazel
-University Computing Service
-Cambridge CB2 3QH, England.
-.fi
-.
-.
-.SH REVISION
-.rs
-.sp
-.nf
-Last updated: 07 January 2012
-Copyright (c) 1997-2012 University of Cambridge.
-.fi