olm/lib/doctest/doc/markdown/build-systems.md

Build systems

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

include(ExternalProject)
find_package(Git REQUIRED)

ExternalProject_Add(
    doctest
    PREFIX ${CMAKE_BINARY_DIR}/doctest
    GIT_REPOSITORY https://github.com/onqtam/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:

# 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:

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 - read the comments in the file on how to use it. It works just like the same functionality in Catch.

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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