mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-14 09:34:46 +00:00
456 lines
16 KiB
CMake
456 lines
16 KiB
CMake
#[======================================================[.rst
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Adds the following targets::
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pybind11::pybind11 - link to Python headers and pybind11::headers
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pybind11::module - Adds module links
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pybind11::embed - Adds embed links
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pybind11::lto - Link time optimizations (only if CMAKE_INTERPROCEDURAL_OPTIMIZATION is not set)
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pybind11::thin_lto - Link time optimizations (only if CMAKE_INTERPROCEDURAL_OPTIMIZATION is not set)
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pybind11::python_link_helper - Adds link to Python libraries
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pybind11::windows_extras - MSVC bigobj and mp for building multithreaded
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pybind11::opt_size - avoid optimizations that increase code size
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Adds the following functions::
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pybind11_strip(target) - strip target after building on linux/macOS
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pybind11_find_import(module) - See if a module is installed.
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#]======================================================]
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# CMake 3.10 has an include_guard command, but we can't use that yet
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# include_guard(global) (pre-CMake 3.10)
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if(TARGET pybind11::pybind11)
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return()
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endif()
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# If we are in subdirectory mode, all IMPORTED targets must be GLOBAL. If we
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# are in CONFIG mode, they should be "normal" targets instead.
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# In CMake 3.11+ you can promote a target to global after you create it,
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# which might be simpler than this check.
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get_property(
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is_config
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TARGET pybind11::headers
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PROPERTY IMPORTED)
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if(NOT is_config)
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set(optional_global GLOBAL)
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endif()
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# If not run in Python mode, we still would like this to at least
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# include pybind11's include directory:
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set(pybind11_INCLUDE_DIRS
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"${pybind11_INCLUDE_DIR}"
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CACHE INTERNAL "Include directory for pybind11 (Python not requested)")
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if(CMAKE_CROSSCOMPILING AND PYBIND11_USE_CROSSCOMPILING)
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set(_PYBIND11_CROSSCOMPILING
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ON
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CACHE INTERNAL "")
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else()
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set(_PYBIND11_CROSSCOMPILING
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OFF
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CACHE INTERNAL "")
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endif()
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# --------------------- Shared targets ----------------------------
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# Build an interface library target:
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add_library(pybind11::pybind11 IMPORTED INTERFACE ${optional_global})
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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::headers)
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# Build a module target:
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add_library(pybind11::module IMPORTED INTERFACE ${optional_global})
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set_property(
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TARGET pybind11::module
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APPEND
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PROPERTY INTERFACE_LINK_LIBRARIES pybind11::pybind11)
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# Build an embed library target:
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add_library(pybind11::embed IMPORTED INTERFACE ${optional_global})
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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)
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# -------------- emscripten requires exceptions enabled -------------
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# _pybind11_no_exceptions is a private mechanism to disable this addition.
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# Please open an issue if you need to use it; it will be removed if no one
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# needs it.
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if(CMAKE_SYSTEM_NAME MATCHES Emscripten AND NOT _pybind11_no_exceptions)
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if(CMAKE_VERSION VERSION_LESS 3.13)
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message(WARNING "CMake 3.13+ is required to build for Emscripten. Some flags will be missing")
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else()
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if(is_config)
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set(_tmp_config_target pybind11::pybind11_headers)
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else()
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set(_tmp_config_target pybind11_headers)
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endif()
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set_property(
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TARGET ${_tmp_config_target}
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APPEND
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PROPERTY INTERFACE_LINK_OPTIONS -fexceptions)
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set_property(
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TARGET ${_tmp_config_target}
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS -fexceptions)
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unset(_tmp_config_target)
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endif()
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endif()
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# --------------------------- link helper ---------------------------
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add_library(pybind11::python_link_helper IMPORTED INTERFACE ${optional_global})
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if(CMAKE_VERSION VERSION_LESS 3.13)
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# In CMake 3.11+, you can set INTERFACE properties via the normal methods, and
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# this would be simpler.
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set_property(
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TARGET pybind11::python_link_helper
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APPEND
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PROPERTY INTERFACE_LINK_LIBRARIES "$<$<PLATFORM_ID:Darwin>:-undefined dynamic_lookup>")
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else()
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# link_options was added in 3.13+
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# This is safer, because you are ensured the deduplication pass in CMake will not consider
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# these separate and remove one but not the other.
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set_property(
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TARGET pybind11::python_link_helper
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APPEND
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PROPERTY INTERFACE_LINK_OPTIONS "$<$<PLATFORM_ID:Darwin>:LINKER:-undefined,dynamic_lookup>")
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endif()
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# ------------------------ Windows extras -------------------------
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add_library(pybind11::windows_extras IMPORTED INTERFACE ${optional_global})
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if(MSVC) # That's also clang-cl
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# /bigobj is needed for bigger binding projects due to the limit to 64k
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# addressable sections
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set_property(
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TARGET pybind11::windows_extras
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS $<$<COMPILE_LANGUAGE:CXX>:/bigobj>)
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# /MP enables multithreaded builds (relevant when there are many files) for MSVC
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if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") # no Clang no Intel
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if(CMAKE_VERSION VERSION_LESS 3.11)
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set_property(
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TARGET pybind11::windows_extras
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS $<$<NOT:$<CONFIG:Debug>>:/MP>)
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else()
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# Only set these options for C++ files. This is important so that, for
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# instance, projects that include other types of source files like CUDA
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# .cu files don't get these options propagated to nvcc since that would
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# cause the build to fail.
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set_property(
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TARGET pybind11::windows_extras
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS
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$<$<NOT:$<CONFIG:Debug>>:$<$<COMPILE_LANGUAGE:CXX>:/MP>>)
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endif()
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endif()
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endif()
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# ----------------------- Optimize binary size --------------------------
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add_library(pybind11::opt_size IMPORTED INTERFACE ${optional_global})
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if(MSVC)
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set(PYBIND11_OPT_SIZE /Os)
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else()
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set(PYBIND11_OPT_SIZE -Os)
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endif()
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set_property(
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TARGET pybind11::opt_size
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS $<$<CONFIG:Release>:${PYBIND11_OPT_SIZE}>
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$<$<CONFIG:MinSizeRel>:${PYBIND11_OPT_SIZE}>
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$<$<CONFIG:RelWithDebInfo>:${PYBIND11_OPT_SIZE}>)
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# ----------------------- Legacy option --------------------------
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# Warn or error if old variable name used
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if(PYBIND11_CPP_STANDARD)
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string(REGEX MATCH [[..$]] VAL "${PYBIND11_CPP_STANDARD}")
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if(CMAKE_CXX_STANDARD)
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if(NOT CMAKE_CXX_STANDARD STREQUAL VAL)
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message(WARNING "CMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD} does not match "
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"PYBIND11_CPP_STANDARD=${PYBIND11_CPP_STANDARD}, "
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"please remove PYBIND11_CPP_STANDARD from your cache")
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endif()
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else()
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set(supported_standards 11 14 17 20)
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if("${VAL}" IN_LIST supported_standards)
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message(WARNING "USE -DCMAKE_CXX_STANDARD=${VAL} instead of PYBIND11_CPP_STANDARD")
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set(CMAKE_CXX_STANDARD
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${VAL}
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CACHE STRING "From PYBIND11_CPP_STANDARD")
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else()
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message(FATAL_ERROR "PYBIND11_CPP_STANDARD should be replaced with CMAKE_CXX_STANDARD "
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"(last two chars: ${VAL} not understood as a valid CXX std)")
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endif()
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endif()
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endif()
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# --------------------- Python specifics -------------------------
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# CMake 3.27 removes the classic FindPythonInterp if CMP0148 is NEW
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if(CMAKE_VERSION VERSION_LESS "3.27")
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set(_pybind11_missing_old_python "OLD")
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else()
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cmake_policy(GET CMP0148 _pybind11_missing_old_python)
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endif()
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# Check to see which Python mode we are in, new, old, or no python
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if(PYBIND11_NOPYTHON)
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set(_pybind11_nopython ON)
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# We won't use new FindPython if PYBIND11_FINDPYTHON is defined and falselike
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# Otherwise, we use if FindPythonLibs is missing or if FindPython was already used
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elseif(
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(NOT DEFINED PYBIND11_FINDPYTHON OR PYBIND11_FINDPYTHON)
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AND (_pybind11_missing_old_python STREQUAL "NEW"
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OR PYBIND11_FINDPYTHON
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OR Python_FOUND
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OR Python3_FOUND
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))
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# New mode
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include("${CMAKE_CURRENT_LIST_DIR}/pybind11NewTools.cmake")
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else()
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# Classic mode
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include("${CMAKE_CURRENT_LIST_DIR}/pybind11Tools.cmake")
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endif()
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# --------------------- pybind11_find_import -------------------------------
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if(NOT _pybind11_nopython AND NOT _PYBIND11_CROSSCOMPILING)
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# Check to see if modules are importable. Use REQUIRED to force an error if
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# one of the modules is not found. <package_name>_FOUND will be set if the
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# package was found (underscores replace dashes if present). QUIET will hide
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# the found message, and VERSION will require a minimum version. A successful
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# find will cache the result.
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function(pybind11_find_import PYPI_NAME)
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# CMake variables need underscores (PyPI doesn't care)
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string(REPLACE "-" "_" NORM_PYPI_NAME "${PYPI_NAME}")
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# Return if found previously
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if(${NORM_PYPI_NAME}_FOUND)
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return()
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endif()
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set(options "REQUIRED;QUIET")
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set(oneValueArgs "VERSION")
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cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "" ${ARGN})
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if(ARG_REQUIRED)
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set(status_level FATAL_ERROR)
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else()
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set(status_level WARNING)
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endif()
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execute_process(
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COMMAND
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${${_Python}_EXECUTABLE} -c "
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try:
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from importlib.metadata import version
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except ImportError:
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from pkg_resources import get_distribution
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def version(s):
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return get_distribution(s).version
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print(version('${PYPI_NAME}'))
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"
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RESULT_VARIABLE RESULT_PRESENT
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OUTPUT_VARIABLE PKG_VERSION
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ERROR_QUIET)
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string(STRIP "${PKG_VERSION}" PKG_VERSION)
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# If a result is present, this failed
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if(RESULT_PRESENT)
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set(${NORM_PYPI_NAME}_FOUND
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${NORM_PYPI_NAME}-NOTFOUND
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CACHE INTERNAL "")
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# Always warn or error
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message(
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${status_level}
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"Missing: ${PYPI_NAME} ${ARG_VERSION}\nTry: ${${_Python}_EXECUTABLE} -m pip install ${PYPI_NAME}"
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)
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else()
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if(ARG_VERSION AND PKG_VERSION VERSION_LESS ARG_VERSION)
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message(
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${status_level}
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"Version incorrect: ${PYPI_NAME} ${PKG_VERSION} found, ${ARG_VERSION} required - try upgrading"
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)
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else()
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set(${NORM_PYPI_NAME}_FOUND
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YES
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CACHE INTERNAL "")
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set(${NORM_PYPI_NAME}_VERSION
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${PKG_VERSION}
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CACHE INTERNAL "")
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endif()
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if(NOT ARG_QUIET)
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message(STATUS "Found ${PYPI_NAME} ${PKG_VERSION}")
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endif()
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endif()
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if(NOT ARG_VERSION OR (NOT PKG_VERSION VERSION_LESS ARG_VERSION))
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# We have successfully found a good version, cache to avoid calling again.
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endif()
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endfunction()
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endif()
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# --------------------- LTO -------------------------------
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include(CheckCXXCompilerFlag)
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# Checks whether the given CXX/linker flags can compile and link a cxx file.
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# cxxflags and linkerflags are lists of flags to use. The result variable is a
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# unique variable name for each set of flags: the compilation result will be
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# cached base on the result variable. If the flags work, sets them in
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# cxxflags_out/linkerflags_out internal cache variables (in addition to
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# ${result}).
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function(_pybind11_return_if_cxx_and_linker_flags_work result cxxflags linkerflags cxxflags_out
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linkerflags_out)
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set(CMAKE_REQUIRED_LIBRARIES ${linkerflags})
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check_cxx_compiler_flag("${cxxflags}" ${result})
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if(${result})
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set(${cxxflags_out}
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"${cxxflags}"
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PARENT_SCOPE)
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set(${linkerflags_out}
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"${linkerflags}"
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PARENT_SCOPE)
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endif()
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endfunction()
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function(_pybind11_generate_lto target prefer_thin_lto)
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if(MINGW)
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message(STATUS "${target} disabled (problems with undefined symbols for MinGW for now)")
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return()
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endif()
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if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
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set(cxx_append "")
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set(linker_append "")
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if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT APPLE)
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# Clang Gold plugin does not support -Os; append -O3 to MinSizeRel builds to override it
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set(linker_append ";$<$<CONFIG:MinSizeRel>:-O3>")
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND NOT MINGW)
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set(cxx_append ";-fno-fat-lto-objects")
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endif()
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if(prefer_thin_lto)
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set(thin "=thin")
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else()
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set(thin "")
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endif()
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le" OR CMAKE_SYSTEM_PROCESSOR MATCHES "mips64")
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# Do nothing
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elseif(CMAKE_SYSTEM_NAME MATCHES Emscripten)
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# This compile is very costly when cross-compiling, so set this without checking
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set(PYBIND11_LTO_CXX_FLAGS "-flto${thin}${cxx_append}")
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set(PYBIND11_LTO_LINKER_FLAGS "-flto${thin}${linker_append}")
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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_pybind11_return_if_cxx_and_linker_flags_work(
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HAS_FLTO_THIN "-flto${thin}${cxx_append}" "-flto${thin}${linker_append}"
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PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
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endif()
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if(NOT HAS_FLTO_THIN)
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_pybind11_return_if_cxx_and_linker_flags_work(
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HAS_FLTO "-flto${cxx_append}" "-flto${linker_append}" PYBIND11_LTO_CXX_FLAGS
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PYBIND11_LTO_LINKER_FLAGS)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "IntelLLVM")
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# IntelLLVM equivalent to LTO is called IPO; also IntelLLVM is WIN32/UNIX
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# WARNING/HELP WANTED: This block of code is currently not covered by pybind11 GitHub Actions!
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if(WIN32)
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_pybind11_return_if_cxx_and_linker_flags_work(
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HAS_INTEL_IPO "-Qipo" "-Qipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
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else()
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_pybind11_return_if_cxx_and_linker_flags_work(
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HAS_INTEL_IPO "-ipo" "-ipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
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# Intel equivalent to LTO is called IPO
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_pybind11_return_if_cxx_and_linker_flags_work(HAS_INTEL_IPO "-ipo" "-ipo"
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PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
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elseif(MSVC)
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# cmake only interprets libraries as linker flags when they start with a - (otherwise it
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# converts /LTCG to \LTCG as if it was a Windows path). Luckily MSVC supports passing flags
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# with - instead of /, even if it is a bit non-standard:
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_pybind11_return_if_cxx_and_linker_flags_work(HAS_MSVC_GL_LTCG "/GL" "-LTCG"
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PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
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endif()
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# Enable LTO flags if found, except for Debug builds
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if(PYBIND11_LTO_CXX_FLAGS)
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# CONFIG takes multiple values in CMake 3.19+, until then we have to use OR
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set(is_debug "$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>")
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set(not_debug "$<NOT:${is_debug}>")
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set(cxx_lang "$<COMPILE_LANGUAGE:CXX>")
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if(MSVC AND CMAKE_VERSION VERSION_LESS 3.11)
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set(genex "${not_debug}")
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else()
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set(genex "$<AND:${not_debug},${cxx_lang}>")
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endif()
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set_property(
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TARGET ${target}
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APPEND
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PROPERTY INTERFACE_COMPILE_OPTIONS "$<${genex}:${PYBIND11_LTO_CXX_FLAGS}>")
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if(CMAKE_PROJECT_NAME STREQUAL "pybind11")
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message(STATUS "${target} enabled")
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endif()
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else()
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if(CMAKE_PROJECT_NAME STREQUAL "pybind11")
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message(STATUS "${target} disabled (not supported by the compiler and/or linker)")
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endif()
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endif()
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if(PYBIND11_LTO_LINKER_FLAGS)
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if(CMAKE_VERSION VERSION_LESS 3.11)
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set_property(
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TARGET ${target}
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APPEND
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PROPERTY INTERFACE_LINK_LIBRARIES "$<${not_debug}:${PYBIND11_LTO_LINKER_FLAGS}>")
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else()
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set_property(
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TARGET ${target}
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APPEND
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PROPERTY INTERFACE_LINK_OPTIONS "$<${not_debug}:${PYBIND11_LTO_LINKER_FLAGS}>")
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endif()
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endif()
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endfunction()
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if(NOT DEFINED CMAKE_INTERPROCEDURAL_OPTIMIZATION)
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add_library(pybind11::lto IMPORTED INTERFACE ${optional_global})
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_pybind11_generate_lto(pybind11::lto FALSE)
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add_library(pybind11::thin_lto IMPORTED INTERFACE ${optional_global})
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_pybind11_generate_lto(pybind11::thin_lto TRUE)
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endif()
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# ---------------------- pybind11_strip -----------------------------
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function(pybind11_strip target_name)
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# Strip unnecessary sections of the binary on Linux/macOS
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if(CMAKE_STRIP)
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if(APPLE)
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set(x_opt -x)
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endif()
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add_custom_command(
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TARGET ${target_name}
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POST_BUILD
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COMMAND ${CMAKE_STRIP} ${x_opt} $<TARGET_FILE:${target_name}>)
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endif()
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endfunction()
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