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.. _cross_compile_macos :
Cross compilation on MacOS
==========================
This is a first attempt to support Cross compilation of VPP on MacOS for development (linting, completion, compile_commands.json)
**Prerequisites**
* You'll need to install the following packages
.. code-block:: console
$ pip3 install ply pyyaml jsonschema
$ brew install diffutils gnu-sed pkg-config ninja crosstool-ng
* You'll also need to install ``gnu-ident 2.2.11`` to be able to ``make checkstyle``. This can be done with :ref:`this doc<install_indent_2_2_11>`
* You should link the binaries to make them available in your path with their original names e.g. :
.. code-block:: console
$ ln -s $(which gsed) /usr/local/bin/sed
$ ln -s $(which gindent) /usr/local/bin/indent
$ ln -s /usr/local/Cellar/diffutils/3.7/bin/diff /usr/local/bin/diff
**Setup**
* Create a `cross compile toolchain <https://crosstool-ng.github.io/>`_
* Create a case sensitive volume and mount the toolchain in it e.g. in ``/Volumes/xchain``
* Create a xchain.toolchain file with ``$VPP_DIR/extras/scripts/cross_compile_macos.sh conf /Volumes/xchan``
For now we don't support e-build so dpdk, rdma, quicly won't be compiled as part of ``make build``
To build with the toolchain do:
.. code-block:: console
$ $VPP_DIR/extras/scripts/cross_compile_macos.sh build
To get the compile_commands.json do
.. code-block:: console
$ $VPP_DIR/extras/scripts/cross_compile_macos.sh cc
$ >> ./build-root/build-vpp[_debug]-native/vpp/compile_commands.json
This should build vpp on MacOS
Good luck :)
.. _install_indent_2_2_11 :
Installing indent 2.2.11
------------------------
In order to install indent on macos :
.. code-block:: bash
$ wget http://mirror.sergal.org/gnu/indent/indent-2.2.11.tar.gz
$ tar -xzvf indent-2.2.11.tar.gz
$ cd indent-2.2.11
$ ./configure --disable-dependency-tracking --disable-debug --program-prefix=g --prefix=/usr/local/Cellar/gnu-indent/2.2.11
Install will exit with an error code, but indent 2.2.11 will still be installed in ``/usr/local/bin/gindent``
Other mirrors can be found on the `GNU website <https://www.gnu.org/prep/ftp.html>`_
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