kc3-lang/libevent/test-export/CMakeLists.txt

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• Hash : acfac7ae
  Author :
  Date : 2022-12-01T18:39:52
  

  Make dependency paths relocatable
  
  The generated configurations for both CMake and pkg-config included
  absolute paths to dependencies (OpenSSL, MbedTLS). This is contrary
  to the general CMake advise to create relocatable packages [1].
  
  Additionally, when building both mbedtls and libevent via CMake's
  FetchContent in the same project, loading the project would fail with
  
    INTERFACE_INCLUDE_DIRECTORIES property contains path:
      "/home/user/project/cmake-build/_deps/mbedtls-build/include"
    which is prefixed in the source directory.
  
  The required changes include:
  - Adding the outer includes only to the BUILD_INTERFACE solves the
    makes the CMake paths relocatable and thus solves the FetchContent
    problem.
  - Updates to libevent_*.pc.in fixes the relocatable issues for
    pkg-config and properly declares currently missing dependencies.
  - Using components for linking to OpenSSL (requiring CMake 3.4)
    and MbedTLS. The new MbedTLS target names now match the component
    names of the MbedTLS' CMake project.
  - Use the Threads CMake library reference instead of a direct
    reference to support both built-in pthread and -lpthread.
  
  v2 (azat): get back CMAKE_REQUIRED_LIBRARIES
  
  [1] https://cmake.org/cmake/help/v3.25/manual/cmake-packages.7.html#creating-relocatable-packages
  

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• test-export/CMakeLists.txt

• cmake_minimum_required(VERSION 3.4)
  if (POLICY CMP0074)
      cmake_policy(SET CMP0074 NEW)
  endif()
  list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../cmake")
  project(verify)
  # set(CMAKE_VERBOSE_MAKEFILE 1)
  if(NOT ${EVENT__CODE_COMPONENT} STREQUAL "")
      string(TOUPPER ${EVENT__CODE_COMPONENT} _UPPER_COMPONENT)
  endif()
  find_package(Libevent 2.2.0 REQUIRED COMPONENTS ${EVENT__LINK_COMPONENT})
  add_definitions(-DEVENT_EXPORT_TEST_COMPONENT_${_UPPER_COMPONENT})
  add_executable(test-export test-export.c)
  target_link_libraries(test-export ${LIBEVENT_LIBRARIES})
  enable_testing()
  add_test(test-export test-export)
  

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