76 lines
2.4 KiB
CMake
76 lines
2.4 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# CMakeFindDependencyMacro
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# -------------------------
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#
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# ::
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#
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# find_dependency(<dep> [<version> [EXACT]])
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#
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#
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# ``find_dependency()`` wraps a :command:`find_package` call for a package
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# dependency. It is designed to be used in a <package>Config.cmake file, and it
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# forwards the correct parameters for EXACT, QUIET and REQUIRED which were
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# passed to the original :command:`find_package` call. It also sets an
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# informative diagnostic message if the dependency could not be found.
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#
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macro(find_dependency dep)
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if (NOT ${dep}_FOUND)
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set(cmake_fd_version)
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if (${ARGC} GREATER 1)
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if ("${ARGV1}" STREQUAL "")
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message(FATAL_ERROR "Invalid arguments to find_dependency. VERSION is empty")
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endif()
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if ("${ARGV1}" STREQUAL EXACT)
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message(FATAL_ERROR "Invalid arguments to find_dependency. EXACT may only be specified if a VERSION is specified")
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endif()
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set(cmake_fd_version ${ARGV1})
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endif()
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set(cmake_fd_exact_arg)
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if(${ARGC} GREATER 2)
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if (NOT "${ARGV2}" STREQUAL EXACT)
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message(FATAL_ERROR "Invalid arguments to find_dependency")
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endif()
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set(cmake_fd_exact_arg EXACT)
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endif()
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if(${ARGC} GREATER 3)
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message(FATAL_ERROR "Invalid arguments to find_dependency")
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endif()
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set(cmake_fd_quiet_arg)
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if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
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set(cmake_fd_quiet_arg QUIET)
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endif()
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set(cmake_fd_required_arg)
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if(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
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set(cmake_fd_required_arg REQUIRED)
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endif()
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get_property(cmake_fd_alreadyTransitive GLOBAL PROPERTY
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_CMAKE_${dep}_TRANSITIVE_DEPENDENCY
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)
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find_package(${dep} ${cmake_fd_version}
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${cmake_fd_exact_arg}
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${cmake_fd_quiet_arg}
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${cmake_fd_required_arg}
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)
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if(NOT DEFINED cmake_fd_alreadyTransitive OR cmake_fd_alreadyTransitive)
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set_property(GLOBAL PROPERTY _CMAKE_${dep}_TRANSITIVE_DEPENDENCY TRUE)
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endif()
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if (NOT ${dep}_FOUND)
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set(${CMAKE_FIND_PACKAGE_NAME}_NOT_FOUND_MESSAGE "${CMAKE_FIND_PACKAGE_NAME} could not be found because dependency ${dep} could not be found.")
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set(${CMAKE_FIND_PACKAGE_NAME}_FOUND False)
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return()
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endif()
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set(cmake_fd_version)
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set(cmake_fd_required_arg)
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set(cmake_fd_quiet_arg)
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set(cmake_fd_exact_arg)
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endif()
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endmacro()
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