Expat, Release 2.2.9

This is Expat, a C library for parsing XML, started by
James Clark in 1997.
Expat is a stream-oriented XML parser. This means that you register
handlers with the parser before starting the parse. These handlers
are called when the parser discovers the associated structures in the
document being parsed. A start tag is an example of the kind of
structures for which you may register handlers.

Expat supports the following compilers:

• GNU GCC >=4.5
• LLVM Clang >=3.5
• Microsoft Visual Studio >=8.0/2005

Windows users can use the
expat_win32 package,
which includes both precompiled libraries and executables, and source code for
developers.

Expat is free software.
You may copy, distribute, and modify it under the terms of the License
contained in the file
COPYING
distributed with this package.
This license is the same as the MIT/X Consortium license.

If you are building Expat from a check-out from the
Git repository,
you need to run a script that generates the configure script using the
GNU autoconf and libtool tools. To do this, you need to have
autoconf 2.58 or newer. Run the script like this:

./buildconf.sh

Once this has been done, follow the same instructions as for building
from a source distribution.

To build Expat from a source distribution, you first run the
configuration shell script in the top level distribution directory:

./configure

There are many options which you may provide to configure (which you
can discover by running configure with the --help option). But the
one of most interest is the one that sets the installation directory.
By default, the configure script will set things up to install
libexpat into /usr/local/lib, expat.h into /usr/local/include, and
xmlwf into /usr/local/bin. If, for example, you'd prefer to install
into /home/me/mystuff/lib, /home/me/mystuff/include, and
/home/me/mystuff/bin, you can tell configure about that with:

./configure --prefix=/home/me/mystuff

Another interesting option is to enable 64-bit integer support for
line and column numbers and the over-all byte index:

./configure CPPFLAGS=-DXML_LARGE_SIZE

However, such a modification would be a breaking change to the ABI
and is therefore not recommended for general use — e.g. as part of
a Linux distribution — but rather for builds with special requirements.

After running the configure script, the make command will build
things and make install will install things into their proper
location. Have a look at the Makefile to learn about additional
make options. Note that you need to have write permission into
the directories into which things will be installed.

If you are interested in building Expat to provide document
information in UTF-16 encoding rather than the default UTF-8, follow
these instructions (after having run make distclean).
Please note that we configure with --without-xmlwf as xmlwf does not
support this mode of compilation (yet):

1. Mass-patch Makefile.am files to use libexpatw.la for a library name:
   
   find -name Makefile.am -exec sed -e 's,libexpat\.la,libexpatw.la,' -e 's,libexpat_la,libexpatw_la,' -i {} +

2. Run automake to re-write Makefile.in files:
   automake

3. For UTF-16 output as unsigned short (and version/error strings as char),
   run:
   ./configure CPPFLAGS=-DXML_UNICODE --without-xmlwf
   For UTF-16 output as wchar_t (incl. version/error strings), run:
   ./configure CFLAGS="-g -O2 -fshort-wchar" CPPFLAGS=-DXML_UNICODE_WCHAR_T --without-xmlwf
   Note: The latter requires libc compiled with -fshort-wchar, as well.

4. Run make (which excludes xmlwf).

5. Run make install (again, excludes xmlwf).

Using DESTDIR is supported. It works as follows:

make install DESTDIR=/path/to/image

overrides the in-makefile set DESTDIR, because variable-setting priority is

1. commandline
2. in-makefile
3. environment

Note: This only applies to the Expat library itself, building UTF-16 versions
of xmlwf and the tests is currently not supported.

When using Expat with a project using autoconf for configuration, you
can use the probing macro in conftools/expat.m4 to determine how to
include Expat. See the comments at the top of that file for more
information.

A reference manual is available in the file doc/reference.html in this
distribution.

The CMake build system is still experimental and will replace the primary
build system based on GNU Autotools at some point when it is ready.
For an idea of the available (non-advanced) options for building with CMake:

# rm -f CMakeCache.txt ; cmake -D_EXPAT_HELP=ON -LH ., grep -B1 ':.*=', sed 's,^--$,,'
// Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel ...
CMAKE_BUILD_TYPE:STRING=

// Install path prefix, prepended onto install directories.
CMAKE_INSTALL_PREFIX:PATH=/usr/local

// Path to a program.
DOCBOOK_TO_MAN:FILEPATH=/usr/bin/docbook2x-man

// build man page for xmlwf
EXPAT_BUILD_DOCS:BOOL=ON

// build the examples for expat library
EXPAT_BUILD_EXAMPLES:BOOL=ON

// build fuzzers for the expat library
EXPAT_BUILD_FUZZERS:BOOL=OFF

// build the tests for expat library
EXPAT_BUILD_TESTS:BOOL=ON

// build the xmlwf tool for expat library
EXPAT_BUILD_TOOLS:BOOL=ON

// Character type to use (char, ushort, wchar_t) [default=char]
EXPAT_CHAR_TYPE:STRING=char

// install expat files in cmake install target
EXPAT_ENABLE_INSTALL:BOOL=ON

// Use /MT flag (static CRT) when compiling in MSVC
EXPAT_MSVC_STATIC_CRT:BOOL=OFF

// build a shared expat library
EXPAT_SHARED_LIBS:BOOL=ON

// Treat all compiler warnings as errors
EXPAT_WARNINGS_AS_ERRORS:BOOL=OFF

// Make use of getrandom function (ON, OFF, AUTO) [default=AUTO]
EXPAT_WITH_GETRANDOM:STRING=AUTO

// utilize libbsd (for arc4random_buf)
EXPAT_WITH_LIBBSD:BOOL=OFF

// Make use of syscall SYS_getrandom (ON, OFF, AUTO) [default=AUTO]
EXPAT_WITH_SYS_GETRANDOM:STRING=AUTO