64 lines
3.2 KiB
CMake
64 lines
3.2 KiB
CMake
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if(NOT DEFINED EXTERNAL_LIBRARIES_EXISTS)
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set(EXTERNAL_LIBRARIES_EXISTS true)
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macro(use_external_library_from_package NAME VERSION INCLUDE_VAR LIBRARY_VAR LINKAGE REQUIRED)
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# need to set CMAKE_FIND_LIBRARY_SUFFIXES temporarily to be able to find static libs, save the current value to be able to restore
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set(DEFAULT_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
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# handle arguments VERSION and REQUIRED
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if("${VERSION}" STREQUAL "ANY_VERSION")
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set(${NAME}_COMPATIBLE_VERSION "")
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else()
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set(${NAME}_COMPATIBLE_VERSION ${VERSION})
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endif()
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if("${REQUIRED}" STREQUAL "OPTIONAL")
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set(${NAME}_REQUIRED "")
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elseif("${REQUIRED}" STREQUAL "REQUIRED")
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set(${NAME}_REQUIRED "REQUIRED")
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else()
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message(FATAL_ERROR "Invalid use of use_external_library; must specify either REQUIRED or OPTIONAL.")
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endif()
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# find dynamic library
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if(WIN32)
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set(CMAKE_FIND_LIBRARY_SUFFIXES .so)
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else()
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set(CMAKE_FIND_LIBRARY_SUFFIXES .dll.a .dll)
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endif()
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find_package(${NAME} ${${NAME}_COMPATIBLE_VERSION})
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include_directories(${${INCLUDE_VAR}})
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set(${NAME}_DYNAMIC_LIB ${${LIBRARY_VAR}})
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set(${${LIBRARY_VAR}} "")
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# find static library
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if(WIN32)
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set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a)
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else()
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set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
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endif()
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find_package(${NAME} ${${NAME}_COMPATIBLE_VERSION})
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set(${NAME}_STATIC_LIB ${${LIBRARY_VAR}})
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# add library to list of libraries to link against when building dynamic libraries or applications
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if(${NAME}_STATIC_LIB AND (("${LINKAGE}" STREQUAL "AUTO_LINKAGE" AND ((STATIC_LINKAGE AND "${META_PROJECT_TYPE}" STREQUAL "application") OR (STATIC_LIBRARY_LINKAGE AND ("${META_PROJECT_TYPE}" STREQUAL "" OR "${META_PROJECT_TYPE}" STREQUAL "library")))) OR ("${LINKAGE}" STREQUAL "STATIC")))
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list(APPEND LIBRARIES ${${NAME}_STATIC_LIB})
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message(STATUS "Linking ${META_PROJECT_NAME} statically against external library ${NAME}.")
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elseif(${NAME}_DYNAMIC_LIB AND ("${LINKAGE}" STREQUAL "AUTO_LINKAGE" OR ("${LINKAGE}" STREQUAL "SHARED")))
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list(APPEND LIBRARIES ${${NAME}_DYNAMIC_LIB})
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message(STATUS "Linking ${META_PROJECT_NAME} dynamically against external library ${NAME}.")
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else()
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if(${REQUIRED})
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message(FATAL_ERROR "External library ${NAME} required by ${META_PROJECT_NAME} is not available for the specified linkage ${LINKAGE}.")
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else()
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message(WARNING "External library ${NAME} required by ${META_PROJECT_NAME} is not available for the specified linkage ${LINKAGE}.")
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endif()
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endif()
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# add library to list of libraries to be provided as transitive dependencies when building static libraries
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list(APPEND STATIC_LIBRARIES ${${LIBRARY_VAR}})
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# restore altered CMAKE_FIND_LIBRARY_SUFFIXES
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set(CMAKE_FIND_LIBRARY_SUFFIXES ${DEFAULT_CMAKE_FIND_LIBRARY_SUFFIXES})
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set(DEFAULT_CMAKE_FIND_LIBRARY_SUFFIXES "")
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endmacro()
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endif()
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