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FindBoost: Add legacy variables and targets for compatibility
This allows future BoostConfig to NOT define those and users relying on them use the newer FindBoost of newer CMake versions
This commit is contained in:
Alexander Grund
Brad King
parent
e4181eeaf2
commit
0dd6772a89
@ -249,6 +249,155 @@ include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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cmake_policy(PUSH)
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cmake_policy(SET CMP0057 NEW) # if IN_LIST
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function(_boost_get_existing_target component target_var)
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set(names "${component}")
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if(component MATCHES "^([a-z_]*)(python|numpy)([1-9])\\.?([0-9])?$")
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# handle pythonXY and numpyXY versioned components and also python X.Y, mpi_python etc.
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list(APPEND names
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"${CMAKE_MATCH_1}${CMAKE_MATCH_2}" # python
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"${CMAKE_MATCH_1}${CMAKE_MATCH_2}${CMAKE_MATCH_3}" # pythonX
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"${CMAKE_MATCH_1}${CMAKE_MATCH_2}${CMAKE_MATCH_3}${CMAKE_MATCH_4}" #pythonXY
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)
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endif()
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# https://github.com/boost-cmake/boost-cmake uses boost::file_system etc.
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# So handle similar constructions of target names
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string(TOLOWER "${component}" lower_component)
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list(APPEND names "${lower_component}")
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foreach(prefix Boost boost)
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foreach(name IN LISTS names)
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if(TARGET "${prefix}::${name}")
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set(${target_var} "${prefix}::${name}" PARENT_SCOPE)
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return()
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endif()
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endforeach()
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endforeach()
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set(${target_var} "" PARENT_SCOPE)
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endfunction()
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function(_boost_get_canonical_target_name component target_var)
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string(TOLOWER "${component}" component)
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if(component MATCHES "^([a-z_]*)(python|numpy)([1-9])\\.?([0-9])?$")
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# handle pythonXY and numpyXY versioned components and also python X.Y, mpi_python etc.
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set(${target_var} "Boost::${CMAKE_MATCH_1}${CMAKE_MATCH_2}" PARENT_SCOPE)
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else()
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set(${target_var} "Boost::${component}" PARENT_SCOPE)
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endif()
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endfunction()
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macro(_boost_set_in_parent_scope name value)
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# Set a variable in parent scope and make it visibile in current scope
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set(${name} "${value}" PARENT_SCOPE)
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set(${name} "${value}")
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endmacro()
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macro(_boost_set_if_unset name value)
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if(NOT ${name})
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_boost_set_in_parent_scope(${name} "${value}")
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endif()
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endmacro()
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macro(_boost_set_cache_if_unset name value)
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if(NOT ${name})
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set(${name} "${value}" CACHE STRING "" FORCE)
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endif()
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endmacro()
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macro(_boost_append_include_dir target)
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get_target_property(inc "${target}" INTERFACE_INCLUDE_DIRECTORIES)
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if(inc)
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list(APPEND include_dirs "${inc}")
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endif()
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endmacro()
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function(_boost_set_legacy_variables_from_config)
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# Set legacy variables for compatibility if not set
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set(include_dirs "")
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set(library_dirs "")
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set(libraries "")
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# Header targets Boost::headers or Boost::boost
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foreach(comp headers boost)
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_boost_get_existing_target(${comp} target)
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if(target)
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_boost_append_include_dir("${target}")
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endif()
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endforeach()
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# Library targets
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foreach(comp IN LISTS Boost_FIND_COMPONENTS)
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string(TOUPPER ${comp} uppercomp)
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# Overwrite if set
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_boost_set_in_parent_scope(Boost_${uppercomp}_FOUND "${Boost_${comp}_FOUND}")
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if(Boost_${comp}_FOUND)
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_boost_get_existing_target(${comp} target)
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if(NOT target)
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if(Boost_DEBUG OR Boost_VERBOSE)
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message(WARNING "Could not find imported target for required component '${comp}'. Standard variables for this component might be missing. Refer to the documentation of your Boost installation for help on variables to use.")
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endif()
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continue()
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endif()
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_boost_append_include_dir("${target}")
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_boost_set_if_unset(Boost_${uppercomp}_LIBRARY "${target}")
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_boost_set_if_unset(Boost_${uppercomp}_LIBRARIES "${target}") # Very old legacy variable
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list(APPEND libraries "${target}")
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foreach(cfg RELEASE DEBUG)
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get_target_property(lib ${target} IMPORTED_LOCATION_${cfg})
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if(lib)
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get_filename_component(lib_dir "${lib}" DIRECTORY)
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list(APPEND library_dirs ${lib_dir})
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_boost_set_cache_if_unset(Boost_${uppercomp}_LIBRARY_${cfg} "${lib}")
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endif()
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endforeach()
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_boost_get_canonical_target_name("${comp}" canonical_target)
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if(NOT TARGET "${canonical_target}")
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add_library("${canonical_target}" INTERFACE IMPORTED)
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target_link_libraries("${canonical_target}" INTERFACE "${target}")
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endif()
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endif()
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endforeach()
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list(REMOVE_DUPLICATES include_dirs)
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list(REMOVE_DUPLICATES library_dirs)
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_boost_set_if_unset(Boost_INCLUDE_DIRS "${include_dirs}")
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_boost_set_if_unset(Boost_LIBRARY_DIRS "${library_dirs}")
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_boost_set_if_unset(Boost_LIBRARIES "${libraries}")
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_boost_set_if_unset(Boost_VERSION_STRING "${Boost_VERSION_MAJOR}.${Boost_VERSION_MINOR}.${Boost_VERSION_PATCH}")
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find_path(Boost_INCLUDE_DIR
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NAMES boost/version.hpp boost/config.hpp
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HINTS ${Boost_INCLUDE_DIRS}
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NO_DEFAULT_PATH
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)
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if(NOT Boost_VERSION_MACRO OR NOT Boost_LIB_VERSION)
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set(version_file ${Boost_INCLUDE_DIR}/boost/version.hpp)
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if(EXISTS "${version_file}")
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file(STRINGS "${version_file}" contents REGEX "#define BOOST_(LIB_)?VERSION ")
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if(contents MATCHES "#define BOOST_VERSION ([0-9]+)")
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_boost_set_if_unset(Boost_VERSION_MACRO "${CMAKE_MATCH_1}")
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endif()
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if(contents MATCHES "#define BOOST_LIB_VERSION \"([0-9_]+)\"")
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_boost_set_if_unset(Boost_LIB_VERSION "${CMAKE_MATCH_1}")
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endif()
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endif()
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endif()
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_boost_set_if_unset(Boost_MAJOR_VERSION ${Boost_VERSION_MAJOR})
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_boost_set_if_unset(Boost_MINOR_VERSION ${Boost_VERSION_MINOR})
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_boost_set_if_unset(Boost_SUBMINOR_VERSION ${Boost_VERSION_PATCH})
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if(WIN32)
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_boost_set_if_unset(Boost_LIB_DIAGNOSTIC_DEFINITIONS "-DBOOST_LIB_DIAGNOSTIC")
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endif()
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if(NOT TARGET Boost::headers)
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add_library(Boost::headers INTERFACE IMPORTED)
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target_include_directories(Boost::headers INTERFACE ${Boost_INCLUDE_DIRS})
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endif()
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# Legacy targets w/o functionality as all handled by defined targets
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foreach(lib diagnostic_definitions disable_autolinking dynamic_linking)
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if(NOT TARGET Boost::${lib})
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add_library(Boost::${lib} INTERFACE IMPORTED)
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endif()
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endforeach()
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if(NOT TARGET Boost::boost)
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add_library(Boost::boost INTERFACE IMPORTED)
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target_link_libraries(Boost::boost INTERFACE Boost::headers)
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endif()
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endfunction()
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#-------------------------------------------------------------------------------
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# Before we go searching, check whether a boost cmake package is available, unless
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# the user specifically asked NOT to search for one.
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@ -293,6 +442,7 @@ if (NOT Boost_NO_BOOST_CMAKE)
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endif()
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find_package_handle_standard_args(Boost HANDLE_COMPONENTS CONFIG_MODE)
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_boost_set_legacy_variables_from_config()
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# Restore project's policies
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cmake_policy(POP)
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