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pybind11/tools/pybind11NewTools.cmake

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CMake
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# tools/pybind11NewTools.cmake -- Build system for the pybind11 modules
#
# Copyright (c) 2020 Wenzel Jakob <wenzel@inf.ethz.ch> and Henry Schreiner
#
# All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.
get_property(
is_config
TARGET pybind11::headers
PROPERTY IMPORTED)
if(pybind11_FIND_QUIETLY)
set(_pybind11_quiet QUIET)
endif()
if(CMAKE_VERSION VERSION_LESS 3.12)
message(FATAL_ERROR "You cannot use the new FindPython module with CMake < 3.12")
endif()
if(NOT Python_FOUND
AND NOT Python3_FOUND
AND NOT Python2_FOUND)
if(NOT DEFINED Python_FIND_IMPLEMENTATIONS)
set(Python_FIND_IMPLEMENTATIONS CPython PyPy)
endif()
# GitHub Actions like activation
if(NOT DEFINED Python_ROOT_DIR AND DEFINED ENV{pythonLocation})
set(Python_ROOT_DIR "$ENV{pythonLocation}")
endif()
find_package(Python REQUIRED COMPONENTS Interpreter Development ${_pybind11_quiet})
# If we are in submodule mode, export the Python targets to global targets.
# If this behavior is not desired, FindPython _before_ pybind11.
if(NOT is_config)
set_property(TARGET Python::Python PROPERTY IMPORTED_GLOBAL TRUE)
set_property(TARGET Python::Interpreter PROPERTY IMPORTED_GLOBAL TRUE)
if(TARGET Python::Module)
set_property(TARGET Python::Module PROPERTY IMPORTED_GLOBAL TRUE)
endif()
endif()
endif()
if(Python_FOUND)
set(_Python
Python
CACHE INTERNAL "" FORCE)
elseif(Python3_FOUND AND NOT Python2_FOUND)
set(_Python
Python3
CACHE INTERNAL "" FORCE)
elseif(Python2_FOUND AND NOT Python3_FOUND)
set(_Python
Python2
CACHE INTERNAL "" FORCE)
else()
message(AUTHOR_WARNING "Python2 and Python3 both present, pybind11 in "
"PYBIND11_NOPYTHON mode (manually activate to silence warning)")
set(_pybind11_nopython ON)
return()
endif()
if(PYBIND11_MASTER_PROJECT)
if(${_Python}_INTERPRETER_ID MATCHES "PyPy")
message(STATUS "PyPy ${${_Python}_PyPy_VERSION} (Py ${${_Python}_VERSION})")
else()
message(STATUS "${_Python} ${${_Python}_VERSION}")
endif()
endif()
# If a user finds Python, they may forget to include the Interpreter component
# and the following two steps require it. It is highly recommended by CMake
# when finding development libraries anyway, so we will require it.
if(NOT DEFINED ${_Python}_EXECUTABLE)
message(
FATAL_ERROR
"${_Python} was found without the Interpreter component. Pybind11 requires this component.")
endif()
if(NOT DEFINED PYTHON_IS_DEBUG)
# Debug check - see https://stackoverflow.com/questions/646518/python-how-to-detect-debug-Interpreter
execute_process(
COMMAND "${${_Python}_EXECUTABLE}" "-c"
"import sys; sys.exit(hasattr(sys, 'gettotalrefcount'))"
RESULT_VARIABLE _PYTHON_IS_DEBUG)
set(PYTHON_IS_DEBUG
"${_PYTHON_IS_DEBUG}"
CACHE INTERNAL "Python debug status")
endif()
# Get the suffix - SO is deprecated, should use EXT_SUFFIX, but this is
# required for PyPy3 (as of 7.3.1)
if(NOT DEFINED PYTHON_MODULE_EXTENSION)
execute_process(
COMMAND
"${${_Python}_EXECUTABLE}" "-c"
"from distutils import sysconfig as s;print(s.get_config_var('EXT_SUFFIX') or s.get_config_var('SO'))"
OUTPUT_VARIABLE _PYTHON_MODULE_EXTENSION
ERROR_VARIABLE _PYTHON_MODULE_EXTENSION_ERR
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(_PYTHON_MODULE_EXTENSION STREQUAL "")
message(
FATAL_ERROR "pybind11 could not query the module file extension, likely the 'distutils'"
"package is not installed. Full error message:\n${_PYTHON_MODULE_EXTENSION_ERR}")
endif()
# This needs to be available for the pybind11_extension function
set(PYTHON_MODULE_EXTENSION
"${_PYTHON_MODULE_EXTENSION}"
CACHE INTERNAL "")
endif()
# Python debug libraries expose slightly different objects before 3.8
# https://docs.python.org/3.6/c-api/intro.html#debugging-builds
# https://stackoverflow.com/questions/39161202/how-to-work-around-missing-pymodule-create2-in-amd64-win-python35-d-lib
if(PYTHON_IS_DEBUG)
set_property(
TARGET pybind11::pybind11
APPEND
PROPERTY INTERFACE_COMPILE_DEFINITIONS Py_DEBUG)
endif()
# Check on every access - since Python2 and Python3 could have been used - do nothing in that case.
if(DEFINED ${_Python}_INCLUDE_DIRS)
set_property(
TARGET pybind11::pybind11
APPEND
PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<BUILD_INTERFACE:${${_Python}_INCLUDE_DIRS}>)
set(pybind11_INCLUDE_DIRS
"${pybind11_INCLUDE_DIR}" "${${_Python}_INCLUDE_DIRS}"
CACHE INTERNAL "Directories where pybind11 and possibly Python headers are located")
endif()
if(DEFINED ${_Python}_VERSION AND ${_Python}_VERSION VERSION_LESS 3)
set_property(
TARGET pybind11::pybind11
APPEND
PROPERTY INTERFACE_LINK_LIBRARIES pybind11::python2_no_register)
endif()
# In CMake 3.18+, you can find these separately, so include an if
if(TARGET ${_Python}::Python)
set_property(
TARGET pybind11::embed
APPEND
PROPERTY INTERFACE_LINK_LIBRARIES ${_Python}::Python)
endif()
# CMake 3.15+ has this
if(TARGET ${_Python}::Module)
set_property(
TARGET pybind11::module
APPEND
PROPERTY INTERFACE_LINK_LIBRARIES ${_Python}::Module)
else()
set_property(
TARGET pybind11::module
APPEND
PROPERTY INTERFACE_LINK_LIBRARIES pybind11::python_link_helper)
endif()
# WITHOUT_SOABI and WITH_SOABI will disable the custom extension handling used by pybind11.
# WITH_SOABI is passed on to python_add_library.
function(pybind11_add_module target_name)
cmake_parse_arguments(PARSE_ARGV 1 ARG
"STATIC;SHARED;MODULE;THIN_LTO;OPT_SIZE;NO_EXTRAS;WITHOUT_SOABI" "" "")
if(ARG_ADD_LIBRARY_STATIC)
set(type STATIC)
elseif(ARG_ADD_LIBRARY_SHARED)
set(type SHARED)
else()
set(type MODULE)
endif()
if("${_Python}" STREQUAL "Python")
python_add_library(${target_name} ${type} ${ARG_UNPARSED_ARGUMENTS})
elseif("${_Python}" STREQUAL "Python3")
python3_add_library(${target_name} ${type} ${ARG_UNPARSED_ARGUMENTS})
elseif("${_Python}" STREQUAL "Python2")
python2_add_library(${target_name} ${type} ${ARG_UNPARSED_ARGUMENTS})
else()
message(FATAL_ERROR "Cannot detect FindPython version: ${_Python}")
endif()
target_link_libraries(${target_name} PRIVATE pybind11::headers)
if(type STREQUAL "MODULE")
target_link_libraries(${target_name} PRIVATE pybind11::module)
else()
target_link_libraries(${target_name} PRIVATE pybind11::embed)
endif()
if(MSVC)
target_link_libraries(${target_name} PRIVATE pybind11::windows_extras)
endif()
if(DEFINED ${_Python}_VERSION AND ${_Python}_VERSION VERSION_LESS 3)
target_link_libraries(${target_name} PRIVATE pybind11::python2_no_register)
endif()
set_target_properties(${target_name} PROPERTIES CXX_VISIBILITY_PRESET "hidden"
CUDA_VISIBILITY_PRESET "hidden")
# If we don't pass a WITH_SOABI or WITHOUT_SOABI, use our own default handling of extensions
if("${type}" STREQUAL "MODULE" AND (NOT ARG_WITHOUT_SOABI OR NOT "WITH_SOABI" IN_LIST
ARG_UNPARSED_ARGUMENTS))
pybind11_extension(${target_name})
endif()
if(ARG_NO_EXTRAS)
return()
endif()
if(NOT DEFINED CMAKE_INTERPROCEDURAL_OPTIMIZATION)
if(ARG_THIN_LTO)
target_link_libraries(${target_name} PRIVATE pybind11::thin_lto)
else()
target_link_libraries(${target_name} PRIVATE pybind11::lto)
endif()
endif()
if(NOT MSVC AND NOT ${CMAKE_BUILD_TYPE} MATCHES Debug|RelWithDebInfo)
# Strip unnecessary sections of the binary on Linux/macOS
pybind11_strip(${target_name})
endif()
if(MSVC)
target_link_libraries(${target_name} PRIVATE pybind11::windows_extras)
endif()
if(ARG_OPT_SIZE)
target_link_libraries(${target_name} PRIVATE pybind11::opt_size)
endif()
endfunction()
function(pybind11_extension name)
# The extension is precomputed
set_target_properties(${name} PROPERTIES PREFIX "" SUFFIX "${PYTHON_MODULE_EXTENSION}")
endfunction()
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