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Compiling PCRE on non-Unix systems
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----------------------------------
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This document contains the following sections:
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General
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Generic instructions for the PCRE C library
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The C++ wrapper functions
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Building for virtual Pascal
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Stack size in Windows environments
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Comments about Win32 builds
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Building under Windows with BCC5.5
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Building PCRE on OpenVMS
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GENERAL
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I (Philip Hazel) have no knowledge of Windows or VMS sytems and how their
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libraries work. The items in the PCRE distribution and Makefile that relate to
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anything other than Unix-like systems are untested by me.
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There are some other comments and files in the Contrib directory on the ftp
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site that you may find useful. See
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ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
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If you want to compile PCRE for a non-Unix system (especially for a system that
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does not support "configure" and "make" files), note that the basic PCRE
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library consists entirely of code written in Standard C, and so should compile
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successfully on any system that has a Standard C compiler and library. The C++
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wrapper functions are a separate issue (see below).
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The PCRE distribution contains some experimental support for "cmake", but this
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is incomplete and not documented. However if you are a "cmake" user you might
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like to try building with "cmake".
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GENERIC INSTRUCTIONS FOR THE PCRE C LIBRARY
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The following are generic comments about building the PCRE C library "by hand".
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(1) Copy or rename the file config.h.generic as config.h, and edit the macro
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settings that it contains to whatever is appropriate for your environment.
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In particular, if you want to force a specific value for newline, you can
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define the NEWLINE macro.
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An alternative approach is not to edit config.h, but to use -D on the
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compiler command line to make any changes that you need.
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NOTE: There have been occasions when the way in which certain parameters
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in config.h are used has changed between releases. (In the configure/make
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world, this is handled automatically.) When upgrading to a new release,
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you are strongly advised to review config.h.generic before re-using what
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you had previously.
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(2) Copy or rename the file pcre.h.generic as pcre.h.
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(3) EITHER:
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Copy or rename file pcre_chartables.c.dist as pcre_chartables.c.
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OR:
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Compile dftables.c as a stand-alone program, and then run it with the
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single argument "pcre_chartables.c". This generates a set of standard
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character tables and writes them to that file. The tables are generated
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using the default C locale for your system. If you want to use a locale
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that is specified by LC_xxx environment variables, add the -L option to
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the dftables command. You must use this method if you are building on
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a system that uses EBCDIC code.
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The tables in pcre_chartables.c are defaults. The caller of PCRE can
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specify alternative tables at run time.
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(4) Ensure that you have the following header files:
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pcre_internal.h
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ucp.h
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ucpinternal.h
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ucptable.h
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(5) Also ensure that you have the following file, which is #included as source
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when building a debugging version of PCRE and is also used by pcretest.
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pcre_printint.src
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(6) Compile the following source files:
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pcre_chartables.c
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pcre_compile.c
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pcre_config.c
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pcre_dfa_exec.c
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pcre_exec.c
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pcre_fullinfo.c
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pcre_get.c
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pcre_globals.c
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pcre_info.c
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pcre_maketables.c
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pcre_newline.c
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pcre_ord2utf8.c
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pcre_refcount.c
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pcre_study.c
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pcre_tables.c
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pcre_try_flipped.c
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pcre_ucp_searchfuncs.c
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pcre_valid_utf8.c
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pcre_version.c
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pcre_xclass.c
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(7) Now link all the compiled code into an object library in whichever form
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your system keeps such libraries. This is the basic PCRE C library. If
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your system has static and shared libraries, you may have to do this once
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for each type.
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(8) Similarly, compile pcreposix.c and link the result (on its own) as the
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pcreposix library.
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(9) Compile the test program pcretest.c. This needs the functions in the
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pcre and pcreposix libraries when linking. It also needs the
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pcre_printint.src source file, which it #includes.
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(10) Run pcretest on the testinput files in the testdata directory, and check
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that the output matches the corresponding testoutput files. Note that the
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supplied files are in Unix format, with just LF characters as line
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terminators. You may need to edit them to change this if your system uses
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a different convention.
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(11) If you want to use the pcregrep command, compile and link pcregrep.c; it
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uses only the basic PCRE library (it does not need the pcreposix library).
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THE C++ WRAPPER FUNCTIONS
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The PCRE distribution also contains some C++ wrapper functions and tests,
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contributed by Google Inc. On a system that can use "configure" and "make",
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the functions are automatically built into a library called pcrecpp. It should
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be straightforward to compile the .cc files manually on other systems. The
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files called xxx_unittest.cc are test programs for each of the corresponding
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xxx.cc files.
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BUILDING FOR VIRTUAL PASCAL
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A script for building PCRE using Borland's C++ compiler for use with VPASCAL
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was contributed by Alexander Tokarev. Stefan Weber updated the script and added
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additional files. The following files in the distribution are for building PCRE
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for use with VP/Borland: makevp_c.txt, makevp_l.txt, makevp.bat, pcregexp.pas.
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STACK SIZE IN WINDOWS ENVIRONMENTS
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The default processor stack size of 1Mb in some Windows environments is too
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small for matching patterns that need much recursion. In particular, test 2 may
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fail because of this. Normally, running out of stack causes a crash, but there
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have been cases where the test program has just died silently. See your linker
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documentation for how to increase stack size if you experience problems. The
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Linux default of 8Mb is a reasonable choice for the stack, though even that can
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be too small for some pattern/subject combinations. There is more about stack
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usage in the "pcrestack" documentation.
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COMMENTS ABOUT WIN32 BUILDS
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There are two ways of building PCRE using the "configure, make, make install"
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paradigm on Windows systems: using MinGW or using Cygwin. These are not at all
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the same thing; they are completely different from each other. There is also
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some experimental, undocumented support for building using "cmake", which you
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might like to try if you are familiar with "cmake". However, at the present
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time, the "cmake" process builds only a static library (not a dll), and the
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tests are not automatically run.
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The MinGW home page (http://www.mingw.org/) says this:
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MinGW: A collection of freely available and freely distributable Windows
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specific header files and import libraries combined with GNU toolsets that
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allow one to produce native Windows programs that do not rely on any
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3rd-party C runtime DLLs.
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The Cygwin home page (http://www.cygwin.com/) says this:
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Cygwin is a Linux-like environment for Windows. It consists of two parts:
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. A DLL (cygwin1.dll) which acts as a Linux API emulation layer providing
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substantial Linux API functionality
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. A collection of tools which provide Linux look and feel.
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The Cygwin DLL currently works with all recent, commercially released x86 32
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bit and 64 bit versions of Windows, with the exception of Windows CE.
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On both MinGW and Cygwin, PCRE should build correctly using:
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./configure && make && make install
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This should create two libraries called libpcre and libpcreposix, and, if you
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have enabled building the C++ wrapper, a third one called libpcrecpp. These are
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independent libraries: when you like with libpcreposix or libpcrecpp you must
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also link with libpcre, which contains the basic functions. (Some earlier
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releases of PCRE included the basic libpcre functions in libpcreposix. This no
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longer happens.)
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If you want to statically link your program against a non-dll .a file, you must
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define PCRE_STATIC before including pcre.h, otherwise the pcre_malloc() and
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pcre_free() exported functions will be declared __declspec(dllimport), with
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unwanted results.
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Using Cygwin's compiler generates libraries and executables that depend on
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cygwin1.dll. If a library that is generated this way is distributed,
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cygwin1.dll has to be distributed as well. Since cygwin1.dll is under the GPL
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licence, this forces not only PCRE to be under the GPL, but also the entire
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application. A distributor who wants to keep their own code proprietary must
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purchase an appropriate Cygwin licence.
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MinGW has no such restrictions. The MinGW compiler generates a library or
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executable that can run standalone on Windows without any third party dll or
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licensing issues.
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But there is more complication:
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If a Cygwin user uses the -mno-cygwin Cygwin gcc flag, what that really does is
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to tell Cygwin's gcc to use the MinGW gcc. Cygwin's gcc is only acting as a
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front end to MinGW's gcc (if you install Cygwin's gcc, you get both Cygwin's
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gcc and MinGW's gcc). So, a user can:
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. Build native binaries by using MinGW or by getting Cygwin and using
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-mno-cygwin.
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. Build binaries that depend on cygwin1.dll by using Cygwin with the normal
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compiler flags.
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The test files that are supplied with PCRE are in Unix format, with LF
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characters as line terminators. It may be necessary to change the line
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terminators in order to get some of the tests to work. We hope to improve
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things in this area in future.
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BUILDING UNDER WINDOWS WITH BCC5.5
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Michael Roy sent these comments about building PCRE under Windows with BCC5.5:
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Some of the core BCC libraries have a version of PCRE from 1998 built in,
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which can lead to pcre_exec() giving an erroneous PCRE_ERROR_NULL from a
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version mismatch. I'm including an easy workaround below, if you'd like to
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include it in the non-unix instructions:
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When linking a project with BCC5.5, pcre.lib must be included before any of
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the libraries cw32.lib, cw32i.lib, cw32mt.lib, and cw32mti.lib on the command
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line.
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BUILDING PCRE ON OPENVMS
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Dan Mooney sent the following comments about building PCRE on OpenVMS. They
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relate to an older version of PCRE that used fewer source files, so the exact
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commands will need changing. See the current list of source files above.
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"It was quite easy to compile and link the library. I don't have a formal
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make file but the attached file [reproduced below] contains the OpenVMS DCL
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commands I used to build the library. I had to add #define
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POSIX_MALLOC_THRESHOLD 10 to pcre.h since it was not defined anywhere.
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The library was built on:
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O/S: HP OpenVMS v7.3-1
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Compiler: Compaq C v6.5-001-48BCD
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Linker: vA13-01
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The test results did not match 100% due to the issues you mention in your
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documentation regarding isprint(), iscntrl(), isgraph() and ispunct(). I
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modified some of the character tables temporarily and was able to get the
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results to match. Tests using the fr locale did not match since I don't have
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that locale loaded. The study size was always reported to be 3 less than the
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value in the standard test output files."
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=========================
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$! This DCL procedure builds PCRE on OpenVMS
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$!
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$! I followed the instructions in the non-unix-use file in the distribution.
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$!
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$ COMPILE == "CC/LIST/NOMEMBER_ALIGNMENT/PREFIX_LIBRARY_ENTRIES=ALL_ENTRIES
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$ COMPILE DFTABLES.C
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$ LINK/EXE=DFTABLES.EXE DFTABLES.OBJ
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$ RUN DFTABLES.EXE/OUTPUT=CHARTABLES.C
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$ COMPILE MAKETABLES.C
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$ COMPILE GET.C
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$ COMPILE STUDY.C
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$! I had to set POSIX_MALLOC_THRESHOLD to 10 in PCRE.H since the symbol
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$! did not seem to be defined anywhere.
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$! I edited pcre.h and added #DEFINE SUPPORT_UTF8 to enable UTF8 support.
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$ COMPILE PCRE.C
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$ LIB/CREATE PCRE MAKETABLES.OBJ, GET.OBJ, STUDY.OBJ, PCRE.OBJ
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$! I had to set POSIX_MALLOC_THRESHOLD to 10 in PCRE.H since the symbol
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$! did not seem to be defined anywhere.
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$ COMPILE PCREPOSIX.C
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$ LIB/CREATE PCREPOSIX PCREPOSIX.OBJ
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$ COMPILE PCRETEST.C
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$ LINK/EXE=PCRETEST.EXE PCRETEST.OBJ, PCRE/LIB, PCREPOSIX/LIB
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$! C programs that want access to command line arguments must be
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$! defined as a symbol
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$ PCRETEST :== "$ SYS$ROADSUSERS:[DMOONEY.REGEXP]PCRETEST.EXE"
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$! Arguments must be enclosed in quotes.
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$ PCRETEST "-C"
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$! Test results:
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$!
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$! The test results did not match 100%. The functions isprint(), iscntrl(),
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$! isgraph() and ispunct() on OpenVMS must not produce the same results
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$! as the system that built the test output files provided with the
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$! distribution.
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$!
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$! The study size did not match and was always 3 less on OpenVMS.
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$!
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$! Locale could not be set to fr
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$!
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=========================
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Last Updated: 05 July 2007
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****
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