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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, meson 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 (on)
--with-history          history support for xmllint shell (off)
--with-readline[=DIR]   use readline in DIR for shell (off)
--with-html             HTML parser (on)
--with-http             HTTP support (off)
--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 (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-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 (off)

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 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.

Meson

Libxml can also be built with meson. Without option, simply call

meson setup builddir
ninja -C builddir

To add options, see the meson_options.txt file. For example:

meson setup \
    -Dprefix=$prefix \
    -Dhistory=enabled \
    -Dhttp=enabled \
    -Dschematron=disabled \
    -Dzlib=enabled \
    builddir

To install libxml:

ninja -C builddir install

To launch tests:

meson test -C builddir

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).

The iconv function is required for conversion of character encodings. This function is part of POSIX.1-2001. If your platform doesn't provide iconv, you need an external libiconv library, for example GNU libiconv. Alternatively, you can use ICU.

If enabled, libxml uses libz or liblzma to support reading compressed files. Use of this feature is discouraged.

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.

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