build-systems

    ## Build systems

    The latest released version of doctest can be obtained from here: https://raw.githubusercontent.com/doctest/doctest/master/doctest/doctest.h

    You can substitute ```master``` with ```dev``` or a tag like ```1.2.9``` for a specific version in the URL above.

    ### CMake

    - **doctest** is easiest to use as a single file inside your own repository. Then the following minimal example will work:

    ```cmake
    cmake_minimum_required(VERSION 3.0)
    project(cmake_test VERSION 0.0.1 LANGUAGES CXX)

    # Prepare doctest for other targets to use
    find_package(doctest REQUIRED)

    # Make test executable
    add_executable(tests main.cpp)
    target_compile_features(test PRIVATE cxx_std_17)
    target_link_libraries(test PRIVATE doctest::doctest)
    ```

    - You can also use the following CMake snippet to automatically fetch the entire **doctest** repository from github and configure it as an external project:

    ```cmake
    include(ExternalProject)
    find_package(Git REQUIRED)

    ExternalProject_Add(
        doctest
        PREFIX ${CMAKE_BINARY_DIR}/doctest
        GIT_REPOSITORY https://github.com/doctest/doctest.git
        TIMEOUT 10
        UPDATE_COMMAND ${GIT_EXECUTABLE} pull
        CONFIGURE_COMMAND ""
        BUILD_COMMAND ""
        INSTALL_COMMAND ""
        LOG_DOWNLOAD ON
    )

    # Expose required variable (DOCTEST_INCLUDE_DIR) to parent scope
    ExternalProject_Get_Property(doctest source_dir)
    set(DOCTEST_INCLUDE_DIR ${source_dir}/doctest CACHE INTERNAL "Path to include folder for doctest")
    ```

    And later you'll be able to use the doctest include directory like this:

    ```cmake
    # add it globally
    include_directories(${DOCTEST_INCLUDE_DIR})

    # or per target
    target_include_directories(my_target PUBLIC ${DOCTEST_INCLUDE_DIR})
    ```

    - If you have the entire doctest repository available (as a submodule or just as files) you could also include it in your CMake build by using ```add_subdirectory(path/to/doctest)``` and then you could use it like this:

    ```cmake
    add_executable(my_tests src_1.cpp src_2.cpp ...)
    target_link_libraries(my_tests doctest)
    ```

    - The ```CMakeLists.txt``` file of the doctest repository has ```install()``` commands so you could also use doctest as a package.

    - To discover tests from an executable and register them in ctest you could use [```doctest_discover_tests(<target>)``` from scripts/cmake/doctest.cmake](../../scripts/cmake/doctest.cmake) - read the comments in the file on how to use it. It works just like [the same functionality in Catch](https://github.com/catchorg/Catch2/blob/master/docs/cmake-integration.html#automatic-test-registration).

    ### Package managers

    **doctest** is available through the following package managers:

    - vcpkg
    - hunter
    - conan
        - https://bintray.com/bincrafters/public-conan/doctest:bincrafters
        - https://bintray.com/mmha/conan/doctest%3Ammha
    - Homebrew (`brew install doctest`)

    ---

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