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# libxml2
libxml2 is an XML toolkit implemented in C, originally developed for
the GNOME Project.
Official releases can be downloaded from
<https://download.gnome.org/sources/libxml2/>
The git repository is hosted on GNOME's GitLab server:
<https://gitlab.gnome.org/GNOME/libxml2>
Bugs should be reported at
<https://gitlab.gnome.org/GNOME/libxml2/-/issues>
Documentation is available at
<https://gitlab.gnome.org/GNOME/libxml2/-/wikis>
## License
This code is released under the MIT License, see the Copyright file.
## Build instructions
libxml2 can be built with GNU Autotools, CMake, or several other build
systems in platform-specific subdirectories.
### Autotools (for POSIX systems like Linux, BSD, macOS)
If you build from a Git tree, you have to install Autotools and start
by generating the configuration files with:
./autogen.sh [configuration options]
If you build from a source tarball, extract the archive with:
tar xf libxml2-xxx.tar.gz
cd libxml2-xxx
Then you can configure and build the library:
./configure [configuration options]
make
The following options disable or enable code modules and relevant symbols:
--with-c14n Canonical XML 1.0 support (on)
--with-catalog XML Catalogs support (on)
--with-debug debugging module and shell (on)
--with-history history support for shell (off)
--with-readline[=DIR] use readline in DIR (for shell history)
--with-html HTML parser (on)
--with-http HTTP support (on)
--with-iconv[=DIR] iconv support (on)
--with-icu ICU support (off)
--with-iso8859x ISO-8859-X support if no iconv (on)
--with-lzma[=DIR] use liblzma in DIR (on)
--with-mem-debug memory debugging module (off)
--with-modules dynamic modules support (on)
--with-output serialization support (on)
--with-pattern xmlPattern selection interface (on)
--with-push push parser interfaces (on)
--with-python Python bindings (on)
--with-reader xmlReader parsing interface (on)
--with-regexps regular expressions support (on)
--with-run-debug runtime debugging module (off)
--with-sax1 older SAX1 interface (on)
--with-schemas XML Schemas 1.0 and RELAX NG support (on)
--with-schematron Schematron support (on)
--with-threads multithreading support (on)
--with-thread-alloc per-thread malloc hooks (off)
--with-tree DOM like tree manipulation APIs (on)
--with-valid DTD validation support (on)
--with-writer xmlWriter serialization interface (on)
--with-xinclude XInclude 1.0 support (on)
--with-xpath XPath 1.0 support (on)
--with-xptr XPointer support (on)
--with-zlib[=DIR] use libz in DIR (on)
Other options:
--with-minimum build a minimally sized library (off)
--with-legacy maximum ABI compatibility (off)
Note that by default, no optimization options are used. You have to
enable them manually, for example with:
CFLAGS='-O2 -fno-semantic-interposition' ./configure
Now you can run the test suite with:
make check
Please report test failures to the mailing list or bug tracker.
Then you can install the library:
make install
At that point you may have to rerun ldconfig or a similar utility to
update your list of installed shared libs.
### CMake (mainly for Windows)
Another option for compiling libxml is using CMake:
cmake -E tar xf libxml2-xxx.tar.gz
cmake -S libxml2-xxx -B libxml2-xxx-build [possible options]
cmake --build libxml2-xxx-build
cmake --install libxml2-xxx-build
Common CMake options include:
-D BUILD_SHARED_LIBS=OFF # build static libraries
-D CMAKE_BUILD_TYPE=Release # specify build type
-D CMAKE_INSTALL_PREFIX=/usr/local # specify the install path
-D LIBXML2_WITH_ICONV=OFF # disable iconv
-D LIBXML2_WITH_LZMA=OFF # disable liblzma
-D LIBXML2_WITH_PYTHON=OFF # disable Python
-D LIBXML2_WITH_ZLIB=OFF # disable libz
You can also open the libxml source directory with its CMakeLists.txt
directly in various IDEs such as CLion, QtCreator, or Visual Studio.
## Dependencies
Libxml does not require any other libraries. A platform with somewhat
recent POSIX support should be sufficient (please report any violation
to this rule you may find).
However, if found at configuration time, libxml will detect and use
the following libraries:
- [libz](https://zlib.net/), a highly portable and widely available
compression library.
- [liblzma](https://tukaani.org/xz/), another compression library.
- [libiconv](https://www.gnu.org/software/libiconv/), a character encoding
conversion library. The iconv function is part of POSIX.1-2001, so
libiconv isn't required on modern UNIX-like systems like Linux, BSD or
macOS.
- [ICU](https://icu.unicode.org/), a Unicode library. Mainly useful as an
alternative to iconv on Windows. Unnecessary on most other systems.
## Contributing
The current version of the code can be found in GNOME's GitLab at
at <https://gitlab.gnome.org/GNOME/libxml2>. The best way to get involved
is by creating issues and merge requests on GitLab. Alternatively, you can
start discussions and send patches to the mailing list. If you want to
work with patches, please format them with git-format-patch and use plain
text attachments.
All code must conform to C89 and pass the GitLab CI tests. Add regression
tests if possible.
## Authors
- Daniel Veillard
- Bjorn Reese
- William Brack
- Igor Zlatkovic for the Windows port
- Aleksey Sanin
- Nick Wellnhofer