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# CMakeLists.txt -- Build system for the pybind11 modules
#
# Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
#
# All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.
cmake_minimum_required(VERSION 2.8.12)
project(pybind11)
# Check if pybind11 is being used directly or via add_subdirectory
set(PYBIND11_MASTER_PROJECT OFF)
if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
set(PYBIND11_MASTER_PROJECT ON)
endif()
option(PYBIND11_INSTALL "Install pybind11 header files?" ${PYBIND11_MASTER_PROJECT})
option(PYBIND11_TEST "Build pybind11 test suite?" ${PYBIND11_MASTER_PROJECT})
option(PYBIND11_WERROR "Report all warnings as errors" OFF)
# Add a CMake parameter for choosing a desired Python version
set(PYBIND11_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling modules")
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/tools")
set(Python_ADDITIONAL_VERSIONS 3.4 3.5 3.6 3.7)
find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} REQUIRED)
include(CheckCXXCompilerFlag)
if(NOT MSVC AND NOT PYBIND11_CPP_STANDARD)
check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
check_cxx_compiler_flag("-std=c++11" HAS_CPP11_FLAG)
if (HAS_CPP14_FLAG)
set(PYBIND11_CPP_STANDARD -std=c++14)
elseif (HAS_CPP11_FLAG)
set(PYBIND11_CPP_STANDARD -std=c++11)
else()
message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
endif()
set(PYBIND11_CPP_STANDARD ${PYBIND11_CPP_STANDARD} CACHE STRING
"C++ standard flag, e.g. -std=c++11 or -std=c++14. Defaults to latest available." FORCE)
endif()
# Cache variables so pybind11_add_module can be used in parent projects
set(PYBIND11_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}/include" CACHE INTERNAL "")
set(PYTHON_INCLUDE_DIRS ${PYTHON_INCLUDE_DIRS} CACHE INTERNAL "")
set(PYTHON_LIBRARIES ${PYTHON_LIBRARIES} CACHE INTERNAL "")
set(PYTHON_MODULE_PREFIX ${PYTHON_MODULE_PREFIX} CACHE INTERNAL "")
set(PYTHON_MODULE_EXTENSION ${PYTHON_MODULE_EXTENSION} CACHE INTERNAL "")
# Build a Python extension module:
# pybind11_add_module(<name> source1 [source2 ...])
#
function(pybind11_add_module target_name)
add_library(${target_name} MODULE ${ARGN})
target_include_directories(${target_name}
PRIVATE ${PYBIND11_INCLUDE_DIR}
PRIVATE ${PYTHON_INCLUDE_DIRS})
# The prefix and extension are provided by FindPythonLibsNew.cmake
set_target_properties(${target_name} PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}")
set_target_properties(${target_name} PROPERTIES SUFFIX "${PYTHON_MODULE_EXTENSION}")
if(WIN32 OR CYGWIN)
# Link against the Python shared library on Windows
target_link_libraries(${target_name} PRIVATE ${PYTHON_LIBRARIES})
elseif(APPLE)
# It's quite common to have multiple copies of the same Python version
# installed on one's system. E.g.: one copy from the OS and another copy
# that's statically linked into an application like Blender or Maya.
# If we link our plugin library against the OS Python here and import it
# into Blender or Maya later on, this will cause segfaults when multiple
# conflicting Python instances are active at the same time (even when they
# are of the same version).
# Windows is not affected by this issue since it handles DLL imports
# differently. The solution for Linux and Mac OS is simple: we just don't
# link against the Python library. The resulting shared library will have
# missing symbols, but that's perfectly fine -- they will be resolved at
# import time.
target_link_libraries(${target_name} PRIVATE "-undefined dynamic_lookup")
endif()
if(NOT MSVC)
# Make sure C++11/14 are enabled
target_compile_options(${target_name} PUBLIC ${PYBIND11_CPP_STANDARD})
# Enable link time optimization and set the default symbol
# visibility to hidden (very important to obtain small binaries)
string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
if (NOT ${U_CMAKE_BUILD_TYPE} MATCHES DEBUG)
# # Check for Link Time Optimization support (GCC/Clang)
check_cxx_compiler_flag("-flto" HAS_LTO_FLAG)
if(HAS_LTO_FLAG AND NOT CYGWIN)
target_compile_options(${target_name} PRIVATE -flto)
endif()
# Intel equivalent to LTO is called IPO
if(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
check_cxx_compiler_flag("-ipo" HAS_IPO_FLAG)
if(HAS_IPO_FLAG)
target_compile_options(${target_name} PRIVATE -ipo)
endif()
endif()
#
if(NOT APPLE)
# # Default symbol visibility
target_compile_options(${target_name} PRIVATE "-fvisibility=hidden")
endif()
# # Strip unnecessary sections of the binary on Linux/Mac OS
if(CMAKE_STRIP)
if(APPLE)
add_custom_command(TARGET ${target_name} POST_BUILD
COMMAND ${CMAKE_STRIP} -u -r $<TARGET_FILE:${target_name}>)
else()
add_custom_command(TARGET ${target_name} POST_BUILD
COMMAND ${CMAKE_STRIP} $<TARGET_FILE:${target_name}>)
endif()
endif()
endif()
elseif(MSVC)
# /MP enables multithreaded builds (relevant when there are many files), /bigobj is
# needed for bigger binding projects due to the limit to 64k addressable sections
target_compile_options(${target_name} PRIVATE /MP /bigobj)
# Enforce link time code generation on MSVC, except in debug mode
target_compile_options(${target_name} PRIVATE $<$<NOT:$<CONFIG:Debug>>:/GL>)
# Fancy generator expressions don't work with linker flags, for reasons unknown
set_property(TARGET ${target_name} APPEND_STRING PROPERTY LINK_FLAGS_RELEASE /LTCG)
set_property(TARGET ${target_name} APPEND_STRING PROPERTY LINK_FLAGS_MINSIZEREL /LTCG)
set_property(TARGET ${target_name} APPEND_STRING PROPERTY LINK_FLAGS_RELWITHDEBINFO /LTCG)
endif()
endfunction()
# Compile with compiler warnings turned on
function(pybind11_enable_warnings target_name)
if(MSVC)
target_compile_options(${target_name} PRIVATE /W4)
else()
target_compile_options(${target_name} PRIVATE -Wall -Wextra -Wconversion)
endif()
if(PYBIND11_WERROR)
if(MSVC)
target_compile_options(${target_name} PRIVATE /WX)
else()
target_compile_options(${target_name} PRIVATE -Werror)
endif()
endif()
endfunction()
set(PYBIND11_HEADERS
include/pybind11/attr.h
include/pybind11/cast.h
include/pybind11/chrono.h
include/pybind11/common.h
include/pybind11/complex.h
include/pybind11/descr.h
include/pybind11/options.h
include/pybind11/eigen.h
include/pybind11/eval.h
include/pybind11/functional.h
include/pybind11/numpy.h
include/pybind11/operators.h
include/pybind11/pybind11.h
include/pybind11/pytypes.h
include/pybind11/stl.h
include/pybind11/stl_bind.h
include/pybind11/typeid.h
)
string(REPLACE "include/" "${CMAKE_CURRENT_SOURCE_DIR}/include/"
PYBIND11_HEADERS "${PYBIND11_HEADERS}")
if (PYBIND11_TEST)
add_subdirectory(tests)
endif()
if (PYBIND11_INSTALL)
install(FILES ${PYBIND11_HEADERS} DESTINATION include/pybind11)
endif()