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CONTRIBUTING.md

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Table of Contents

  1. Contributing to CUB
  2. CMake Options
  3. Development Model

Contributing to CUB

CUB uses Github to manage all open-source development, including bug tracking, pull requests, and design discussions. CUB is tightly coupled to the Thrust project, and a compatible version of Thrust is required when working on the development version of CUB.

To setup a CUB development branch, it is recommended to recursively clone the Thrust repository and use the CUB submodule at dependencies/cub to stage changes. CUB's tests and examples can be built by configuring Thrust with the CMake option THRUST_INCLUDE_CUB_CMAKE=ON.

This process is described in more detail in Thrust's CONTRIBUTING.md.

The CMake options in the following section may be used to customize CUB's build process. Note that some of these are controlled by Thrust for compatibility and may not have an effect when building CUB through the Thrust build system. This is pointed out in the documentation below where applicable.

CMake Options

A CUB build is configured using CMake options. These may be passed to CMake using

cmake -D<option_name>=<value> [Thrust or CUB project source root]

or configured interactively with the ccmake or cmake-gui interfaces.

The configuration options for CUB are:

  • CMAKE_BUILD_TYPE={Release, Debug, RelWithDebInfo, MinSizeRel}
    • Standard CMake build option. Default: RelWithDebInfo
  • CUB_ENABLE_INSTALL_RULES={ON, OFF}
    • If true, installation rules will be generated for CUB. Default is ON when building CUB alone, and OFF when CUB is a subproject added via CMake's add_subdirectory.
  • CUB_ENABLE_HEADER_TESTING={ON, OFF}
    • Whether to test compile public headers. Default is ON.
  • CUB_ENABLE_TESTING={ON, OFF}
    • Whether to build unit tests. Default is ON.
  • CUB_ENABLE_EXAMPLES={ON, OFF}
    • Whether to build examples. Default is ON.
  • CUB_ENABLE_DIALECT_CPPXX={ON, OFF}
    • Setting this has no effect when building CUB as a component of Thrust. See Thrust's dialect options, which CUB will inherit.
    • Toggle whether a specific C++ dialect will be targeted.
    • Multiple dialects may be targeted in a single build.
    • Possible values of XX are {11, 14, 17}.
    • By default, only C++14 is enabled.
  • CUB_ENABLE_RDC_TESTS={ON, OFF}
    • Enable tests that require separable compilation.
    • Default is ON.
  • CUB_FORCE_RDC={ON, OFF}
    • Enable separable compilation on all targets that are agnostic of RDC.
    • Targets that explicitly require RDC to be enabled or disabled will ignore this setting.
    • Default is OFF.

Development Model

CUB follows the same development model as Thrust, described here.