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doctest/doc/markdown/build-systems.md

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## 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 ```v1.4.8``` 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.md#automatic-test-registration).
### Package managers
**doctest** is available through the following package managers:
- vcpkg
- hunter
- conan
- https://conan.io/center/doctest
- https://github.com/conan-io/conan-center-index/tree/master/recipes/doctest
- Homebrew (`brew install doctest`)
---
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