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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# Scan the Boost headers and determine the library dependencies. Note
# that this script only scans one Boost version at once; invoke once
# for each Boost release. Note that this does require the headers for
# a given component to match the library name, since this computes
# inter-library dependencies. Library components for which this
# assumption does not hold true and which have dependencies on other
# Boost libraries will require special-casing. It also doesn't handle
# private dependencies not described in the headers, for static
# library dependencies--this is also a limitation of auto-linking, and
# I'm unaware of any specific instances where this would be
# problematic.
#
# Invoke in script mode, defining these variables:
# BOOST_DIR - the root of the boost includes
#
# The script will process each directory under the root as a
# "component". For each component, all the headers will be scanned to
# determine the components it depends upon by following all the
# possible includes from this component. This is to match the
# behaviour of autolinking.
# Written by Roger Leigh <rleigh@codelibre.net>
# Determine header dependencies on libraries using the embedded dependency information.
#
# component - the component to check (uses all headers from boost/${component})
# includedir - the path to the Boost headers
# _ret_libs - list of library dependencies
#
function(_Boost_FIND_COMPONENT_DEPENDENCIES component includedir _ret_libs)
# _boost_unprocessed_headers - list of headers requiring parsing
# _boost_processed_headers - headers already parsed (or currently being parsed)
# _boost_new_headers - new headers discovered for future processing
set(library_component FALSE)
# Start by finding all headers for the component; header
# dependencies via #include will be solved by future passes
file(GLOB_RECURSE _boost_mpi_python_headers
RELATIVE "${includedir}"
"${includedir}/boost/mpi/python/*")
list(INSERT _boost_mpi_python_headers 0 "boost/mpi/python.hpp")
file(GLOB_RECURSE _boost_python_numpy_headers
RELATIVE "${includedir}"
"${includedir}/boost/python/numpy/*")
list(INSERT _boost_python_numpy_headers 0 "boost/python/numpy.hpp")
# Special-case since it is part of mpi; look only in boost/mpi/python*
if(component STREQUAL "mpi_python")
set(_boost_DEPS "python\${component_python_version}")
set(library_component TRUE)
set(_boost_unprocessed_headers ${_boost_mpi_python_headers})
# Special-case since it is part of python; look only in boost/python/numpy*
elseif(component STREQUAL "numpy")
set(_boost_DEPS "python\${component_python_version}")
set(library_component TRUE)
set(_boost_unprocessed_headers ${_boost_python_numpy_headers})
# Special-case since it is a serialization variant; look in boost/serialization
elseif(component STREQUAL "wserialization")
set(library_component TRUE)
file(GLOB_RECURSE _boost_unprocessed_headers
RELATIVE "${includedir}"
"${includedir}/boost/serialization/*")
list(INSERT _boost_unprocessed_headers 0 "boost/serialization.hpp")
# Not really a library in its own right, but treat it as one
elseif(component STREQUAL "math")
set(library_component TRUE)
file(GLOB_RECURSE _boost_unprocessed_headers
RELATIVE "${includedir}"
"${includedir}/boost/math/*")
list(INSERT _boost_unprocessed_headers 0 "boost/math.hpp")
# Single test header
elseif(component STREQUAL "unit_test_framework")
set(library_component TRUE)
set(_boost_unprocessed_headers "${BOOST_DIR}/test/unit_test.hpp")
# Single test header
elseif(component STREQUAL "prg_exec_monitor")
set(library_component TRUE)
set(_boost_unprocessed_headers "${BOOST_DIR}/test/prg_exec_monitor.hpp")
# Single test header
elseif(component STREQUAL "test_exec_monitor")
set(library_component TRUE)
set(_boost_unprocessed_headers "${BOOST_DIR}/test/test_exec_monitor.hpp")
else()
# Default behaviour where header directory is the same as the library name.
file(GLOB_RECURSE _boost_unprocessed_headers
RELATIVE "${includedir}"
"${includedir}/boost/${component}/*")
list(INSERT _boost_unprocessed_headers 0 "boost/${component}.hpp")
list(REMOVE_ITEM _boost_unprocessed_headers ${_boost_mpi_python_headers} ${_boost_python_numpy_headers})
endif()
while(_boost_unprocessed_headers)
list(APPEND _boost_processed_headers ${_boost_unprocessed_headers})
foreach(header ${_boost_unprocessed_headers})
if(EXISTS "${includedir}/${header}")
file(STRINGS "${includedir}/${header}" _boost_header_includes REGEX "^#[ \t]*include[ \t]*<boost/[^>][^>]*>")
# The optional whitespace before "#" is intentional
# (boost/serialization/config.hpp bug).
file(STRINGS "${includedir}/${header}" _boost_header_deps REGEX "^[ \t]*#[ \t]*define[ \t][ \t]*BOOST_LIB_NAME[ \t][ \t]*boost_")
foreach(line ${_boost_header_includes})
string(REGEX REPLACE "^#[ \t]*include[ \t]*<(boost/[^>][^>]*)>.*" "\\1" _boost_header_match "${line}")
list(FIND _boost_processed_headers "${_boost_header_match}" _boost_header_processed)
list(FIND _boost_new_headers "${_boost_header_match}" _boost_header_new)
if (_boost_header_processed EQUAL -1 AND _boost_header_new EQUAL -1)
list(APPEND _boost_new_headers ${_boost_header_match})
endif()
endforeach()
foreach(line ${_boost_header_deps})
string(REGEX REPLACE "^[ \t]*#[ \t]*define[ \t][ \t]*BOOST_LIB_NAME[ \t][ \t]*boost_([^ \t][^ \t]*).*" "\\1" _boost_component_match "${line}")
string(REPLACE "python3" "python" _boost_component_match "${_boost_component_match}")
string(REPLACE "numpy3" "numpy" _boost_component_match "${_boost_component_match}")
list(FIND _boost_DEPS "${_boost_component_match}" _boost_dep_found)
if(_boost_component_match STREQUAL "bzip2" OR
_boost_component_match STREQUAL "zlib")
# These components may or may not be required; not
# possible to tell without knowing where and when
# BOOST_BZIP2_BINARY and BOOST_ZLIB_BINARY are defined.
# If building against an external zlib or bzip2, this is
# undesirable.
continue()
endif()
if(component STREQUAL "mpi" AND
(_boost_component_match STREQUAL "mpi_python" OR
_boost_component_match STREQUAL "python"))
# Optional python dependency; skip to avoid making it a
# hard dependency (handle as special-case for mpi_python).
continue()
endif()
if(component STREQUAL "python" AND
_boost_component_match STREQUAL "numpy")
# Optional python dependency; skip to avoid making it a
# hard dependency (handle as special-case for numpy).
continue()
endif()
if(component STREQUAL "nowide" AND
_boost_component_match STREQUAL "filesystem")
# Optional filesystem dependency; skip to avoid making it a
# hard dependency.
continue()
endif()
if (_boost_dep_found EQUAL -1 AND
NOT "${_boost_component_match}" STREQUAL "${component}")
list(APPEND _boost_DEPS "${_boost_component_match}")
endif()
if("${_boost_component_match}" STREQUAL "${component}")
set(library_component TRUE)
endif()
endforeach()
endif()
endforeach()
set(_boost_unprocessed_headers ${_boost_new_headers})
unset(_boost_new_headers)
endwhile()
# message(STATUS "Unfiltered dependencies for Boost::${component}: ${_boost_DEPS}")
if(NOT library_component)
unset(_boost_DEPS)
endif()
set(${_ret_libs} ${_boost_DEPS} PARENT_SCOPE)
#string(REGEX REPLACE ";" " " _boost_DEPS_STRING "${_boost_DEPS}")
#if (NOT _boost_DEPS_STRING)
# set(_boost_DEPS_STRING "(none)")
#endif()
#message(STATUS "Dependencies for Boost::${component}: ${_boost_DEPS_STRING}")
endfunction()
message(STATUS "Scanning ${BOOST_DIR}")
# List of all directories and files
file(GLOB boost_contents RELATIVE "${BOOST_DIR}/boost" "${BOOST_DIR}/boost/*")
# Components as directories
foreach(component ${boost_contents})
if(IS_DIRECTORY "${BOOST_DIR}/boost/${component}")
list(APPEND boost_components "${component}")
endif()
endforeach()
# The following components are not top-level directories, so require
# special-casing:
# Special-case mpi_python, since it's a part of mpi
if(IS_DIRECTORY "${BOOST_DIR}/boost/mpi" AND
IS_DIRECTORY "${BOOST_DIR}/boost/python")
list(APPEND boost_components "mpi_python")
endif()
# Special-case numpy, since it's a part of python
if(IS_DIRECTORY "${BOOST_DIR}/boost/python" AND
IS_DIRECTORY "${BOOST_DIR}/boost/python/numpy")
list(APPEND boost_components "numpy")
endif()
# Special-case wserialization, which is a variant of serialization
if(IS_DIRECTORY "${BOOST_DIR}/boost/serialization")
list(APPEND boost_components "wserialization")
endif()
# Special-case math* since there are six libraries, but no actual math
# library component. Handle specially when scanning above.
#
# Special-case separate test libraries, which are all part of test
if(EXISTS "${BOOST_DIR}/test/unit_test.hpp")
list(APPEND boost_components "unit_test_framework")
endif()
if(EXISTS "${BOOST_DIR}/test/prg_exec_monitor.hpp")
list(APPEND boost_components "prg_exec_monitor")
endif()
if(EXISTS "${BOOST_DIR}/test/test_exec_monitor.hpp")
list(APPEND boost_components "test_exec_monitor")
endif()
if(boost_components)
list(SORT boost_components)
endif()
# Process each component defined above
foreach(component ${boost_components})
string(TOUPPER ${component} UPPERCOMPONENT)
_Boost_FIND_COMPONENT_DEPENDENCIES("${component}" "${BOOST_DIR}"
_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES)
endforeach()
# Output results
foreach(component ${boost_components})
string(TOUPPER ${component} UPPERCOMPONENT)
if(_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES)
string(REGEX REPLACE ";" " " _boost_DEPS_STRING "${_Boost_${UPPERCOMPONENT}_LIBRARY_DEPENDENCIES}")
message(STATUS "set(_Boost_${UPPERCOMPONENT}_DEPENDENCIES ${_boost_DEPS_STRING})")
endif()
endforeach()
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