mirror of
https://github.com/pybind/pybind11.git
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240 lines
8.4 KiB
CMake
240 lines
8.4 KiB
CMake
# tools/pybind11Tools.cmake -- Build system for the pybind11 modules
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#
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# Copyright (c) 2020 Wenzel Jakob <wenzel.jakob@epfl.ch>
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#
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# All rights reserved. Use of this source code is governed by a
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# BSD-style license that can be found in the LICENSE file.
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# include_guard(global) (pre-CMake 3.10)
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if(TARGET pybind11::python_headers)
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return()
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endif()
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# Built-in in CMake 3.5+
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include(CMakeParseArguments)
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if(pybind11_FIND_QUIETLY)
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set(_pybind11_quiet QUIET)
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else()
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set(_pybind11_quiet "")
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endif()
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# If this is the first run, PYTHON_VERSION can stand in for PYBIND11_PYTHON_VERSION
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if(NOT DEFINED PYBIND11_PYTHON_VERSION AND DEFINED PYTHON_VERSION)
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message(WARNING "Set PYBIND11_PYTHON_VERSION to search for a specific version, not "
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"PYTHON_VERSION (which is an output). Assuming that is what you "
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"meant to do and continuing anyway.")
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set(PYBIND11_PYTHON_VERSION
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"${PYTHON_VERSION}"
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CACHE STRING "Python version to use for compiling modules")
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unset(PYTHON_VERSION)
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unset(PYTHON_VERSION CACHE)
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elseif(DEFINED PYBIND11_PYTHON_VERSION)
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# If this is set as a normal variable, promote it
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set(PYBIND11_PYTHON_VERSION
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"${PYBIND11_PYTHON_VERSION}"
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CACHE STRING "Python version to use for compiling modules")
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else()
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# Make an empty cache variable.
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set(PYBIND11_PYTHON_VERSION
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""
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CACHE STRING "Python version to use for compiling modules")
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endif()
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# A user can set versions manually too
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set(Python_ADDITIONAL_VERSIONS
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"3.12;3.11;3.10;3.9;3.8;3.7;3.6"
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CACHE INTERNAL "")
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
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find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} MODULE REQUIRED ${_pybind11_quiet})
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list(REMOVE_AT CMAKE_MODULE_PATH -1)
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# Makes a normal variable a cached variable
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macro(_PYBIND11_PROMOTE_TO_CACHE NAME)
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set(_tmp_ptc "${${NAME}}")
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# CMake 3.21 complains if a cached variable is shadowed by a normal one
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unset(${NAME})
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set(${NAME}
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"${_tmp_ptc}"
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CACHE INTERNAL "")
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endmacro()
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# Cache variables so pybind11_add_module can be used in parent projects
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_pybind11_promote_to_cache(PYTHON_INCLUDE_DIRS)
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_pybind11_promote_to_cache(PYTHON_LIBRARIES)
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_pybind11_promote_to_cache(PYTHON_MODULE_PREFIX)
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_pybind11_promote_to_cache(PYTHON_MODULE_EXTENSION)
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_pybind11_promote_to_cache(PYTHON_MODULE_DEBUG_POSTFIX)
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_pybind11_promote_to_cache(PYTHON_VERSION_MAJOR)
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_pybind11_promote_to_cache(PYTHON_VERSION_MINOR)
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_pybind11_promote_to_cache(PYTHON_VERSION)
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_pybind11_promote_to_cache(PYTHON_IS_DEBUG)
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if(PYBIND11_MASTER_PROJECT)
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if(PYTHON_MODULE_EXTENSION MATCHES "pypy")
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if(NOT DEFINED PYPY_VERSION)
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execute_process(
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COMMAND ${PYTHON_EXECUTABLE} -c
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[=[import sys; sys.stdout.write(".".join(map(str, sys.pypy_version_info[:3])))]=]
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OUTPUT_VARIABLE pypy_version)
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set(PYPY_VERSION
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${pypy_version}
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CACHE INTERNAL "")
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endif()
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message(STATUS "PYPY ${PYPY_VERSION} (Py ${PYTHON_VERSION})")
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else()
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message(STATUS "PYTHON ${PYTHON_VERSION}")
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endif()
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endif()
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# Only add Python for build - must be added during the import for config since
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# it has to be re-discovered.
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#
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# This needs to be an target to it is included after the local pybind11
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# directory, just in case there are multiple versions of pybind11, we want the
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# one we expect.
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add_library(pybind11::python_headers INTERFACE IMPORTED)
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set_property(TARGET pybind11::python_headers PROPERTY INTERFACE_INCLUDE_DIRECTORIES
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"$<BUILD_INTERFACE:${PYTHON_INCLUDE_DIRS}>")
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set_property(
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TARGET pybind11::pybind11
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APPEND
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PROPERTY INTERFACE_LINK_LIBRARIES pybind11::python_headers)
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set(pybind11_INCLUDE_DIRS
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"${pybind11_INCLUDE_DIR}" "${PYTHON_INCLUDE_DIRS}"
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CACHE INTERNAL "Directories where pybind11 and possibly Python headers are located")
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# Python debug libraries expose slightly different objects before 3.8
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# https://docs.python.org/3.6/c-api/intro.html#debugging-builds
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# https://stackoverflow.com/questions/39161202/how-to-work-around-missing-pymodule-create2-in-amd64-win-python35-d-lib
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if(PYTHON_IS_DEBUG)
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set_property(
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TARGET pybind11::pybind11
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APPEND
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PROPERTY INTERFACE_COMPILE_DEFINITIONS Py_DEBUG)
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endif()
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# The <3.11 code here does not support release/debug builds at the same time, like on vcpkg
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if(CMAKE_VERSION VERSION_LESS 3.11)
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set_property(
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TARGET pybind11::module
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APPEND
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PROPERTY
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INTERFACE_LINK_LIBRARIES
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pybind11::python_link_helper
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"$<$<OR:$<PLATFORM_ID:Windows>,$<PLATFORM_ID:Cygwin>>:$<BUILD_INTERFACE:${PYTHON_LIBRARIES}>>"
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)
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set_property(
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TARGET pybind11::embed
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APPEND
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PROPERTY INTERFACE_LINK_LIBRARIES pybind11::pybind11 $<BUILD_INTERFACE:${PYTHON_LIBRARIES}>)
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else()
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# The IMPORTED INTERFACE library here is to ensure that "debug" and "release" get processed outside
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# of a generator expression - https://gitlab.kitware.com/cmake/cmake/-/issues/18424, as they are
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# target_link_library keywords rather than real libraries.
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add_library(pybind11::_ClassicPythonLibraries IMPORTED INTERFACE)
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target_link_libraries(pybind11::_ClassicPythonLibraries INTERFACE ${PYTHON_LIBRARIES})
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target_link_libraries(
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pybind11::module
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INTERFACE
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pybind11::python_link_helper
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"$<$<OR:$<PLATFORM_ID:Windows>,$<PLATFORM_ID:Cygwin>>:pybind11::_ClassicPythonLibraries>")
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target_link_libraries(pybind11::embed INTERFACE pybind11::pybind11
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pybind11::_ClassicPythonLibraries)
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endif()
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function(pybind11_extension name)
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# The prefix and extension are provided by FindPythonLibsNew.cmake
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set_target_properties(
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${name}
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PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
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DEBUG_POSTFIX "${PYTHON_MODULE_DEBUG_POSTFIX}"
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SUFFIX "${PYTHON_MODULE_EXTENSION}")
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endfunction()
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# Build a Python extension module:
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# pybind11_add_module(<name> [MODULE | SHARED] [EXCLUDE_FROM_ALL]
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# [NO_EXTRAS] [THIN_LTO] [OPT_SIZE] source1 [source2 ...])
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#
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function(pybind11_add_module target_name)
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set(options "MODULE;SHARED;EXCLUDE_FROM_ALL;NO_EXTRAS;SYSTEM;THIN_LTO;OPT_SIZE")
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cmake_parse_arguments(ARG "${options}" "" "" ${ARGN})
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if(ARG_MODULE AND ARG_SHARED)
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message(FATAL_ERROR "Can't be both MODULE and SHARED")
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elseif(ARG_SHARED)
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set(lib_type SHARED)
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else()
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set(lib_type MODULE)
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endif()
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if(ARG_EXCLUDE_FROM_ALL)
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set(exclude_from_all EXCLUDE_FROM_ALL)
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else()
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set(exclude_from_all "")
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endif()
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add_library(${target_name} ${lib_type} ${exclude_from_all} ${ARG_UNPARSED_ARGUMENTS})
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target_link_libraries(${target_name} PRIVATE pybind11::module)
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if(ARG_SYSTEM)
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message(
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STATUS
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"Warning: this does not have an effect - use NO_SYSTEM_FROM_IMPORTED if using imported targets"
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)
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endif()
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pybind11_extension(${target_name})
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# -fvisibility=hidden is required to allow multiple modules compiled against
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# different pybind versions to work properly, and for some features (e.g.
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# py::module_local). We force it on everything inside the `pybind11`
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# namespace; also turning it on for a pybind module compilation here avoids
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# potential warnings or issues from having mixed hidden/non-hidden types.
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if(NOT DEFINED CMAKE_CXX_VISIBILITY_PRESET)
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set_target_properties(${target_name} PROPERTIES CXX_VISIBILITY_PRESET "hidden")
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endif()
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if(NOT DEFINED CMAKE_CUDA_VISIBILITY_PRESET)
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set_target_properties(${target_name} PROPERTIES CUDA_VISIBILITY_PRESET "hidden")
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endif()
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if(ARG_NO_EXTRAS)
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return()
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endif()
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if(NOT DEFINED CMAKE_INTERPROCEDURAL_OPTIMIZATION)
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if(ARG_THIN_LTO)
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target_link_libraries(${target_name} PRIVATE pybind11::thin_lto)
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else()
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target_link_libraries(${target_name} PRIVATE pybind11::lto)
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endif()
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endif()
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if(DEFINED CMAKE_BUILD_TYPE) # see https://github.com/pybind/pybind11/issues/4454
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# Use case-insensitive comparison to match the result of $<CONFIG:cfgs>
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string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
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if(NOT MSVC AND NOT "${uppercase_CMAKE_BUILD_TYPE}" MATCHES DEBUG|RELWITHDEBINFO)
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pybind11_strip(${target_name})
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endif()
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endif()
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if(MSVC)
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target_link_libraries(${target_name} PRIVATE pybind11::windows_extras)
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endif()
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if(ARG_OPT_SIZE)
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target_link_libraries(${target_name} PRIVATE pybind11::opt_size)
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endif()
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endfunction()
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# Provide general way to call common Python commands in "common" file.
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set(_Python
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PYTHON
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CACHE INTERNAL "" FORCE)
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