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Export Catch as a CMake package and 'linkable' target

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Create a namespaced Catch2::Catch target that is 'linkable' through
`target_link_libraries()` and export it so it is findable through
`find_package()`.

`find_package()` will find versions with the same major number and with
minor number >= requested.

This makes catch a lot easier to use in CMake-based projects. Whether it
is found using `find_package` or included in the client project as a
subdirectory, the client can include the catch headers per-target with
`target_include_directories(target PRIVATE Catch2::Catch).

Example usage:

    cmake_minimum_required(VERSION 3.1)

    # include Catch2 as subdirectory or installed package
    # add_subdirectory(Catch2)
    find_package(Catch2 VERSION 2.1.0 REQUIRED)

    add_executable(tests tests/catch_main.cpp)
    target_link_libraries(tests PRIVATE Catch2::Catch)
This commit is contained in:
Daniel J. Rollins 2018-01-29 22:56:43 +00:00 committed by Martin Hořeňovský
parent ba6d33fb8c
commit 39bfc6e82b
1 changed files with 35 additions and 1 deletions
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36
CMakeLists.txt
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@ -1,4 +1,4 @@
cmake_minimum_required(VERSION 3.0)
cmake_minimum_required(VERSION 3.1)
# detect if Catch is being bundled,
# disable testsuite in that case
@ -405,3 +405,37 @@ if(NOT WIN32 OR NOT CMAKE_HOST_SYSTEM_NAME MATCHES Windows)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/catch.pc DESTINATION ${PKGCONFIG_INSTALL_DIR})
endif()
# add catch as a 'linkable' target
add_library(Catch INTERFACE)
# depend on some obvious c++11 features so the dependency is transitively added dependants
target_compile_features(Catch INTERFACE cxx_auto_type cxx_constexpr cxx_noexcept)
target_include_directories(Catch
INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/single_include>
$<INSTALL_INTERFACE:include/catch>
$<INSTALL_INTERFACE:include>)
# provide a namespaced alias for clients to 'link' against if catch is included as a sub-project
add_library(Catch2::Catch ALIAS Catch)
set(CATCH_CMAKE_CONFIG_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Catch2")
# create and install an export set for catch target as Catch2::Catch
install(TARGETS Catch EXPORT Catch2Config DESTINATION ${CMAKE_INSTALL_LIBDIR})
install(EXPORT Catch2Config
NAMESPACE Catch2::
DESTINATION ${CATCH_CMAKE_CONFIG_DESTINATION})
# install Catch2ConfigVersion.cmake file to handle versions in find_package
include(CMakePackageConfigHelpers)
write_basic_package_version_file(Catch2ConfigVersion.cmake
COMPATIBILITY SameMajorVersion)
install(FILES
"${CMAKE_BINARY_DIR}/Catch2ConfigVersion.cmake"
DESTINATION ${CATCH_CMAKE_CONFIG_DESTINATION})