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added a few more comments to the CMake build system

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Wenzel Jakob 2015-10-12 23:57:20 +02:00
parent 215fc6a4ce
commit bcd3182f3d
1 changed files with 27 additions and 11 deletions
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38
CMakeLists.txt
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@ -9,22 +9,28 @@ cmake_minimum_required(VERSION 2.8)
project(pybind)
# Add a CMake parameter for choosing a desired Python version
set(PYBIND_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling the example application")
# Set a default build configuration if none is specified. 'MinSizeRel' produces the smallest binaries
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
message(STATUS "Setting build type to 'MinSizeRel' as none was specified.")
set(CMAKE_BUILD_TYPE MinSizeRel CACHE STRING "Choose the type of build." FORCE)
set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
"MinSizeRel" "RelWithDebInfo")
endif()
set(PYBIND_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling the example application")
string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
set(Python_ADDITIONAL_VERSIONS 3.4 3.5 3.6)
find_package(PythonLibs ${PYBIND_PYTHON_VERSION} REQUIRED)
find_package(PythonInterp ${PYBIND_PYTHON_VERSION} REQUIRED)
string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
if (UNIX)
# Enable C++11 mode
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
# Enable link time optimization and set the default symbol
# visibility to hidden (very important to obtain small binaries)
if (NOT ${U_CMAKE_BUILD_TYPE} MATCHES DEBUG)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -flto")
endif()
@ -41,8 +47,13 @@ else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
endif()
include_directories(${PYTHON_INCLUDE_DIR} include)
# Include path for Python header files
include_directories(${PYTHON_INCLUDE_DIR})
# Include path for pybind11 header files
include_directories(include)
# Create the binding library
add_library(example SHARED
include/pybind/cast.h
include/pybind/common.h
@ -66,14 +77,18 @@ add_library(example SHARED
example/example12.cpp
)
# Don't add a 'lib' prefix to the shared library
set_target_properties(example PROPERTIES PREFIX "")
# Write the output file directly into the 'example' directory
set_target_properties(example PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/example)
if (WIN32)
if (MSVC)
# Enforce size-based optimization and link time code generation on MSVC (~30% smaller binaries in experiments)
# /bigobj is needed for bigger binding projects due to the limit to 64k addressable sections
# /MP enables multithreaded builds
# Enforce size-based optimization and link time code generation
# on MSVC (~30% smaller binaries in experiments). /bigobj is needed
# for bigger binding projects due to the limit to 64k addressable sections
# /MP enables multithreaded builds (relevant when there are many files).
set_target_properties(example PROPERTIES COMPILE_FLAGS "/Os /GL /MP /bigobj")
set_target_properties(example PROPERTIES LINK_FLAGS "/LTCG")
endif()
@ -91,10 +106,11 @@ elseif (UNIX)
# into Blender or Maya later on, this will cause segfaults when multiple
# conflicting Python instances are active at the same time.
# Windows does not seem to be affected by this issue. 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.
# 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.
# .SO file extension on Linux/Mac OS
set_target_properties(example PROPERTIES SUFFIX ".so")