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General Build Information

Last Updated on December 21, 2019

OS Specific Build Guides

Dependencies

CMake External Project Dependencies

These dependencies need not be installed manually. They are automatically downloaded on the platforms where they are required.

The above dependencies will be downloaded, built, linked and included automatically by CMake where we require them. The CMakeLists files that handle grabbing each of the following external dependencies can be found in the cmake/externals folder. The resulting downloads, source files and binaries will be placed in the build/ext folder in each of the subfolders for each external project.

These are not placed in your normal build tree when doing an out of source build so that they do not need to be re-downloaded and re-compiled every time the CMake build folder is cleared. Should you want to force a re-download and re-compile of a specific external, you can simply remove that directory from the appropriate subfolder in build/ext. Should you want to force a re-download and re-compile of all externals, just remove the build/ext folder.

CMake

Athena uses CMake to generate build files and project files for your platform.

Qt

CMake will download Qt 5.12.3 using vcpkg.

To override this (i.e. use an installed Qt configuration - you will need to set a QT_CMAKE_PREFIX_PATH environment variable pointing to your Qt lib/cmake folder.
This can either be entered directly into your shell session before you build or in your shell profile (e.g.: ~/.bash_profile, ~/.bashrc, ~/.zshrc - this depends on your shell and environment). The path it needs to be set to will depend on where and how Qt5 was installed. e.g.

export QT_CMAKE_PREFIX_PATH=/usr/local/Qt5.12.3/gcc_64/lib/cmake
export QT_CMAKE_PREFIX_PATH=/usr/local/qt/5.12.3/clang_64/lib/cmake/
export QT_CMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.12.3/lib/cmake
export QT_CMAKE_PREFIX_PATH=/usr/local/opt/qt5/lib/cmake

Vcpkg

Athena uses vcpkg to download and build dependencies. You do not need to install vcpkg.

Building the dependencies can be lengthy and the resulting files will be stored in your OS temp directory. However, those files can potentially get cleaned up by the OS, so in order to avoid this and having to redo the lengthy build step, you can set the following environment variable:

export HIFI_VCPKG_BASE=/path/to/directory

Where /path/to/directory is the path to a directory where you wish the build files to get stored.

Generating build files

Create a build directory in the root of your checkout and then run the CMake build from there. This will keep the rest of the directory clean.

mkdir build
cd build
cmake ..

If cmake gives you the same error message repeatedly after the build fails, try removing CMakeCache.txt.

Variables

Any variables that need to be set for CMake to find dependencies can be set as ENV variables in your shell profile, or passed directly to CMake with a -D flag appended to the cmake .. command.

For example, to pass the QT_CMAKE_PREFIX_PATH variable (if not using the vcpkg'ed version) during build file generation:

cmake .. -DQT_CMAKE_PREFIX_PATH=/usr/local/qt/5.12.3/lib/cmake

Finding Dependencies

The following applies for dependencies we do not grab via CMake ExternalProject (OpenSSL is an example), or for dependencies you have opted not to grab as a CMake ExternalProject (via -DUSE_LOCAL_$NAME=0). The list of dependencies we grab by default as external projects can be found in the CMake External Project Dependencies section.

You can point our Cmake find modules to the correct version of dependencies by setting one of the three following variables to the location of the correct version of the dependency.

In the examples below the variable $NAME would be replaced by the name of the dependency in uppercase, and $name would be replaced by the name of the dependency in lowercase (ex: OPENSSL_ROOT_DIR, openssl).

  • $NAME_ROOT_DIR - pass this variable to Cmake with the -DNAME_ROOT_DIR= flag when running Cmake to generate build files
  • $NAME_ROOT_DIR - set this variable in your ENV
  • HIFI_LIB_DIR - set this variable in your ENV to your High Fidelity lib folder, should contain a folder '$name'

Optional Components

Build Options

The following build options can be used when running CMake

  • BUILD_CLIENT
  • BUILD_SERVER
  • BUILD_TESTS
  • BUILD_TOOLS

Developer Build Options

  • USE_GLES
  • DISABLE_UI

Devices

You can support external input/output devices such as Leap Motion, MIDI, and more by adding each individual SDK in the visible building path. Refer to the readme file available in each device folder in interface/external/ for the detailed explanation of the requirements to use the device.