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# 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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# Scan the Boost headers and determine the library dependencies. Note
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# that this script only scans one Boost version at once; invoke once
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# for each Boost release. Note that this does require the headers for
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# a given component to match the library name, since this computes
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# inter-library dependencies. Library components for which this
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# assumption does not hold true and which have dependencies on other
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# Boost libraries will require special-casing. It also doesn't handle
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# private dependencies not described in the headers, for static
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# library dependencies--this is also a limitation of auto-linking, and
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# I'm unaware of any specific instances where this would be
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# problematic.
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#
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# Invoke in script mode, defining these variables:
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# BOOST_DIR - the root of the boost includes
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#
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# The script will process each directory under the root as a
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# "component". For each component, all the headers will be scanned to
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# determine the components it depends upon by following all the
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# possible includes from this component. This is to match the
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# behaviour of autolinking.
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# Written by Roger Leigh <rleigh@codelibre.net>
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# Determine header dependencies on libraries using the embedded dependency information.
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#
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# component - the component to check (uses all headers from boost/${component})
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# includedir - the path to the Boost headers
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# _ret_libs - list of library dependencies
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#
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function(_Boost_FIND_COMPONENT_DEPENDENCIES component includedir _ret_libs)
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# _boost_unprocessed_headers - list of headers requiring parsing
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# _boost_processed_headers - headers already parsed (or currently being parsed)
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# _boost_new_headers - new headers discovered for future processing
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set(library_component FALSE)
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# Start by finding all headers for the component; header
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# dependencies via #include will be solved by future passes
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file(GLOB_RECURSE _boost_mpi_python_headers
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RELATIVE "${includedir}"
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"${includedir}/boost/mpi/python/*")
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list(INSERT _boost_mpi_python_headers 0 "boost/mpi/python.hpp")
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file(GLOB_RECURSE _boost_python_numpy_headers
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RELATIVE "${includedir}"
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"${includedir}/boost/python/numpy/*")
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list(INSERT _boost_python_numpy_headers 0 "boost/python/numpy.hpp")
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# Special-case since it is part of mpi; look only in boost/mpi/python*
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if(component STREQUAL "mpi_python")
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set(_boost_DEPS "python")
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set(library_component TRUE)
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set(_boost_unprocessed_headers ${_boost_mpi_python_headers})
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# Special-case since it is part of python; look only in boost/python/numpy*
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elseif(component STREQUAL "numpy")
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set(_boost_DEPS "python")
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set(library_component TRUE)
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set(_boost_unprocessed_headers ${_boost_python_numpy_headers})
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# Special-case since it is a serialization variant; look in boost/serialization
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elseif(component STREQUAL "wserialization")
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set(library_component TRUE)
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file(GLOB_RECURSE _boost_unprocessed_headers
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RELATIVE "${includedir}"
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"${includedir}/boost/serialization/*")
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list(INSERT _boost_unprocessed_headers 0 "boost/serialization.hpp")
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# Not really a library in its own right, but treat it as one
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elseif(component STREQUAL "math")
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set(library_component TRUE)
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file(GLOB_RECURSE _boost_unprocessed_headers
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RELATIVE "${includedir}"
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"${includedir}/boost/math/*")
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list(INSERT _boost_unprocessed_headers 0 "boost/math.hpp")
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# Single test header
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elseif(component STREQUAL "unit_test_framework")
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set(library_component TRUE)
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set(_boost_unprocessed_headers "${BOOST_DIR}/test/unit_test.hpp")
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# Single test header
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elseif(component STREQUAL "prg_exec_monitor")
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set(library_component TRUE)
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set(_boost_unprocessed_headers "${BOOST_DIR}/test/prg_exec_monitor.hpp")
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# Single test header
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elseif(component STREQUAL "test_exec_monitor")
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set(library_component TRUE)
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set(_boost_unprocessed_headers "${BOOST_DIR}/test/test_exec_monitor.hpp")
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else()
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# Default behaviour where header directory is the same as the library name.
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file(GLOB_RECURSE _boost_unprocessed_headers
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RELATIVE "${includedir}"
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"${includedir}/boost/${component}/*")
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list(INSERT _boost_unprocessed_headers 0 "boost/${component}.hpp")
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list(REMOVE_ITEM _boost_unprocessed_headers ${_boost_mpi_python_headers} ${_boost_python_numpy_headers})
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endif()
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while(_boost_unprocessed_headers)
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list(APPEND _boost_processed_headers ${_boost_unprocessed_headers})
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foreach(header ${_boost_unprocessed_headers})
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if(EXISTS "${includedir}/${header}")
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file(STRINGS "${includedir}/${header}" _boost_header_includes REGEX "^#[ \t]*include[ \t]*<boost/[^>][^>]*>")
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# The optional whitespace before "#" is intentional
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# (boost/serialization/config.hpp bug).
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file(STRINGS "${includedir}/${header}" _boost_header_deps REGEX "^[ \t]*#[ \t]*define[ \t][ \t]*BOOST_LIB_NAME[ \t][ \t]*boost_")
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foreach(line ${_boost_header_includes})
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string(REGEX REPLACE "^#[ \t]*include[ \t]*<(boost/[^>][^>]*)>.*" "\\1" _boost_header_match "${line}")
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list(FIND _boost_processed_headers "${_boost_header_match}" _boost_header_processed)
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list(FIND _boost_new_headers "${_boost_header_match}" _boost_header_new)
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if (_boost_header_processed EQUAL -1 AND _boost_header_new EQUAL -1)
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list(APPEND _boost_new_headers ${_boost_header_match})
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endif()
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endforeach()
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foreach(line ${_boost_header_deps})
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string(REGEX REPLACE "^[ \t]*#[ \t]*define[ \t][ \t]*BOOST_LIB_NAME[ \t][ \t]*boost_([^ \t][^ \t]*).*" "\\1" _boost_component_match "${line}")
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string(REPLACE "python3" "python" _boost_component_match "${_boost_component_match}")
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string(REPLACE "numpy3" "numpy" _boost_component_match "${_boost_component_match}")
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list(FIND _boost_DEPS "${_boost_component_match}" _boost_dep_found)
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if(_boost_component_match STREQUAL "bzip2" OR
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_boost_component_match STREQUAL "zlib")
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# These components may or may not be required; not
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# possible to tell without knowing where and when
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# BOOST_BZIP2_BINARY and BOOST_ZLIB_BINARY are defined.
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# If building against an external zlib or bzip2, this is
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# undesirable.
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continue()
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endif()
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if(component STREQUAL "mpi" AND
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(_boost_component_match STREQUAL "mpi_python" OR
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_boost_component_match STREQUAL "python"))
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# Optional python dependency; skip to avoid making it a
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# hard dependency (handle as special-case for mpi_python).
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continue()
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endif()
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if(component STREQUAL "python" AND
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boost_component_match STREQUAL "numpy")
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# Optional python dependency; skip to avoid making it a
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# hard dependency (handle as special-case for numpy).
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continue()
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endif()
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if (_boost_dep_found EQUAL -1 AND
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NOT "${_boost_component_match}" STREQUAL "${component}")
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list(APPEND _boost_DEPS "${_boost_component_match}")
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endif()
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if("${_boost_component_match}" STREQUAL "${component}")
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set(library_component TRUE)
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endif()
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endforeach()
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endif()
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endforeach()
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set(_boost_unprocessed_headers ${_boost_new_headers})
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unset(_boost_new_headers)
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endwhile()
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# message(STATUS "Unfiltered dependencies for Boost::${component}: ${_boost_DEPS}")
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if(NOT library_component)
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unset(_boost_DEPS)
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endif()
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set(${_ret_libs} ${_boost_DEPS} PARENT_SCOPE)
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#string(REGEX REPLACE ";" " " _boost_DEPS_STRING "${_boost_DEPS}")
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#if (NOT _boost_DEPS_STRING)
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# set(_boost_DEPS_STRING "(none)")
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#endif()
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#message(STATUS "Dependencies for Boost::${component}: ${_boost_DEPS_STRING}")
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endfunction()
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message(STATUS "Scanning ${BOOST_DIR}")
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# List of all directories and files
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file(GLOB boost_contents RELATIVE "${BOOST_DIR}/boost" "${BOOST_DIR}/boost/*")
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# Components as directories
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foreach(component ${boost_contents})
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if(IS_DIRECTORY "${BOOST_DIR}/boost/${component}")
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list(APPEND boost_components "${component}")
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endif()
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endforeach()
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# The following components are not top-level directories, so require
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# special-casing:
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# Special-case mpi_python, since it's a part of mpi
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if(IS_DIRECTORY "${BOOST_DIR}/boost/mpi" AND
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IS_DIRECTORY "${BOOST_DIR}/boost/python")
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list(APPEND boost_components "mpi_python")
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endif()
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# Special-case numpy, since it's a part of python
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if(IS_DIRECTORY "${BOOST_DIR}/boost/python" AND
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IS_DIRECTORY "${BOOST_DIR}/boost/python/numpy")
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list(APPEND boost_components "numpy")
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endif()
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# Special-case wserialization, which is a variant of serialization
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if(IS_DIRECTORY "${BOOST_DIR}/boost/serialization")
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list(APPEND boost_components "wserialization")
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endif()
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# Special-case math* since there are six libraries, but no actual math
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# library component. Handle specially when scanning above.
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#
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# Special-case separate test libraries, which are all part of test
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if(EXISTS "${BOOST_DIR}/test/unit_test.hpp")
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list(APPEND boost_components "unit_test_framework")
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endif()
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if(EXISTS "${BOOST_DIR}/test/prg_exec_monitor.hpp")
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list(APPEND boost_components "prg_exec_monitor")
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endif()
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if(EXISTS "${BOOST_DIR}/test/test_exec_monitor.hpp")
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list(APPEND boost_components "test_exec_monitor")
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endif()
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if(boost_components)
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list(SORT boost_components)
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endif()
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# Process each component defined above
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foreach(component ${boost_components})
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string(TOUPPER ${component} UPPERCOMPONENT)
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_Boost_FIND_COMPONENT_DEPENDENCIES("${component}" "${BOOST_DIR}"
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_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES)
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endforeach()
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# Output results
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foreach(component ${boost_components})
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string(TOUPPER ${component} UPPERCOMPONENT)
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if(_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES)
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string(REGEX REPLACE ";" " " _boost_DEPS_STRING "${_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES}")
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message(STATUS "set(_Boost_${UPPERCOMPONENT}_DEPENDENCIES ${_boost_DEPS_STRING})")
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endif()
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endforeach()
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