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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 gnu-sed pkg-config ninja crosstool-ng
* You'll also need to install ``clang-format 10.0.0`` to be able to ``make checkstyle``. This can be done with :ref:`this doc<install_clang_format_10_0_0>`
* You should link the binaries to make them available in your path with their original names e.g. :
.. code-block:: console
$ ln -s $(which gsed) /usr/local/bin/sed
**Setup**
* Create a `cross compile toolchain <https://crosstool-ng.github.io/>`_
* Create a case sensitive volume and mount the toolchain in it e.g. in ``/Volumes/xchain``
* Create a xchain.toolchain file with ``$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_clang_format_10_0_0 :
Installing clang-format 10.0.0
------------------------------
In order to install clang-format on macos :
.. code-block:: bash
$ wget https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/clang-10.0.0.src.tar.xz
$ tar -xvf clang+llvm-10.0.0-x86_64-apple-darwin.tar.xz
$ mv clang+llvm-10.0.0-x86_64-apple-darwin /usr/local/Cellar/
$ sudo ln -s ../Cellar/clang+llvm-10.0.0-x86_64-apple-darwin/bin/clang-format /usr/local/bin/clang-format
$ sudo ln -s ../Cellar/clang+llvm-10.0.0-x86_64-apple-darwin/bin/clang-format /usr/local/bin/clang-format-10
$ sudo ln -s ../Cellar/clang+llvm-10.0.0-x86_64-apple-darwin/share/clang/clang-format-diff.py /usr/local/bin/clang-format-diff-10
Source `Clang website <https://releases.llvm.org/download.html#git>`_
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