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acfac7ae4a
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
17 lines
620 B
CMake
17 lines
620 B
CMake
cmake_minimum_required(VERSION 3.4)
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if (POLICY CMP0074)
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cmake_policy(SET CMP0074 NEW)
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endif()
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../cmake")
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project(verify)
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# set(CMAKE_VERBOSE_MAKEFILE 1)
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if(NOT ${EVENT__CODE_COMPONENT} STREQUAL "")
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string(TOUPPER ${EVENT__CODE_COMPONENT} _UPPER_COMPONENT)
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endif()
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find_package(Libevent 2.2.0 REQUIRED COMPONENTS ${EVENT__LINK_COMPONENT})
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add_definitions(-DEVENT_EXPORT_TEST_COMPONENT_${_UPPER_COMPONENT})
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add_executable(test-export test-export.c)
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target_link_libraries(test-export ${LIBEVENT_LIBRARIES})
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enable_testing()
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add_test(test-export test-export)
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