.. _build.rst:

Building the XRT Software Stack
-------------------------------

Building the XRT Installation Package
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Installing Building Dependencies
................................

XRT requires C++14 compiler and a few development libraries bundled
with modern Linux distribution. Please install the necessary tools and
dependencies using the provided ``xrtdeps.sh``.

::

   sudo <XRT>/src/runtime_src/tools/scripts/xrtdeps.sh

The ``xrtdeps.sh`` script installs the standard distribution packages
for the tools and libraries XRT depends on. If any system libraries
XRT depends on (for example Boost libraries) are updated to non
standard versions, then XRT must be rebuilt.

On RHEL7.x/CentOS7.x use devtoolset to switch to C++14 devlopment
environment. This step is not applicable to Ubuntu, which already has
C++14 capable GCC.

::

   scl enable devtoolset-9 bash

XRT includes source code for ERT firmware. 
It needs to be compiled with the MicroBlaze GCC compiler, which is available in `Xilinx Vitis™ Software Platform <https://www.xilinx.com/products/design-tools/vitis.html>`_. 
To generate a complete XRT package, please install Vitis™ Software Platform and setup XILINX_VITIS environment variable. 
If XILINX_VITIS is not available in the build system, the building and packaging steps for ERT will be skipped. 
On the deployment system, XRT will try to find the ERT firmware in ``/lib/firmware/xilinx`` directory. 
If it's not available, errors will be reported. 


Building the XRT Runtime
........................

::

   cd build
   ./build.sh

``build.sh`` script builds for both Debug and Release profiles.  

On RHEL/CentOS, if ``build.sh`` was accidentally run prior to enabling
the devtoolset, then it is necessary to clean stale files makefiles by
running ``build.sh clean`` prior to the next build.

Please check ERT firmware is built properly at ``build/Release/opt/xilinx/xrt/share/fw/sched*.bin``.


Packaging RPM on RHEL/CentOS or DEB on Ubuntu
.............................................

The package is automatically built for the ``Release``
version but not for the ``Debug`` version::

   cd build/Release
   make package
   cd ../Debug
   make package



Building the XRT Documentation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

XRT Documentation can be built automatically using ``Sphinx`` doc builder
together with Linux kernel based ``kernel-doc`` utility.

To compile and install the documentation into the ``doc`` directory at
the top of the repository::

   cd build
   ./build.sh docs
   # To browse the generated local documentation with a web browser:
   xdg-open Release/runtime_src/doc/html/index.html