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-rw-r--r--ext/pybind11/tools/pybind11Tools.cmake171
1 files changed, 114 insertions, 57 deletions
diff --git a/ext/pybind11/tools/pybind11Tools.cmake b/ext/pybind11/tools/pybind11Tools.cmake
index 4922982fa..3fbffeeff 100644
--- a/ext/pybind11/tools/pybind11Tools.cmake
+++ b/ext/pybind11/tools/pybind11Tools.cmake
@@ -8,12 +8,15 @@
cmake_minimum_required(VERSION 2.8.12)
# Add a CMake parameter for choosing a desired Python version
-set(PYBIND11_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling modules")
+if(NOT PYBIND11_PYTHON_VERSION)
+ set(PYBIND11_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling modules")
+endif()
set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 3.4)
find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} REQUIRED)
include(CheckCXXCompilerFlag)
+include(CMakeParseArguments)
function(select_cxx_standard)
if(NOT MSVC AND NOT PYBIND11_CPP_STANDARD)
@@ -33,29 +36,95 @@ function(select_cxx_standard)
endif()
endfunction()
+# Checks whether the given CXX/linker flags can compile and link a cxx file. cxxflags and
+# linkerflags are lists of flags to use. The result variable is a unique variable name for each set
+# of flags: the compilation result will be cached base on the result variable. If the flags work,
+# sets them in cxxflags_out/linkerflags_out internal cache variables (in addition to ${result}).
+function(_pybind11_return_if_cxx_and_linker_flags_work result cxxflags linkerflags cxxflags_out linkerflags_out)
+ set(CMAKE_REQUIRED_LIBRARIES ${linkerflags})
+ check_cxx_compiler_flag("${cxxflags}" ${result})
+ if (${result})
+ set(${cxxflags_out} "${cxxflags}" CACHE INTERNAL "" FORCE)
+ set(${linkerflags_out} "${linkerflags}" CACHE INTERNAL "" FORCE)
+ endif()
+endfunction()
+
+# Internal: find the appropriate link time optimization flags for this compiler
+function(_pybind11_add_lto_flags target_name prefer_thin_lto)
+ if (NOT DEFINED PYBIND11_LTO_CXX_FLAGS)
+ set(PYBIND11_LTO_CXX_FLAGS "" CACHE INTERNAL "")
+ set(PYBIND11_LTO_LINKER_FLAGS "" CACHE INTERNAL "")
+
+ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+ set(cxx_append "")
+ set(linker_append "")
+ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT APPLE)
+ # Clang Gold plugin does not support -Os; append -O3 to MinSizeRel builds to override it
+ set(linker_append ";$<$<CONFIG:MinSizeRel>:-O3>")
+ elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+ set(cxx_append ";-fno-fat-lto-objects")
+ endif()
+
+ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND prefer_thin_lto)
+ _pybind11_return_if_cxx_and_linker_flags_work(HAS_FLTO_THIN
+ "-flto=thin${cxx_append}" "-flto=thin${linker_append}"
+ PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+ endif()
+
+ if (NOT HAS_FLTO_THIN)
+ _pybind11_return_if_cxx_and_linker_flags_work(HAS_FLTO
+ "-flto${cxx_append}" "-flto${linker_append}"
+ PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+ endif()
+ elseif (CMAKE_CXX_COMPILER_ID MATCHES "Intel")
+ # Intel equivalent to LTO is called IPO
+ _pybind11_return_if_cxx_and_linker_flags_work(HAS_INTEL_IPO
+ "-ipo" "-ipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+ elseif(MSVC)
+ # cmake only interprets libraries as linker flags when they start with a - (otherwise it
+ # converts /LTCG to \LTCG as if it was a Windows path). Luckily MSVC supports passing flags
+ # with - instead of /, even if it is a bit non-standard:
+ _pybind11_return_if_cxx_and_linker_flags_work(HAS_MSVC_GL_LTCG
+ "/GL" "-LTCG" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+ endif()
+
+ if (PYBIND11_LTO_CXX_FLAGS)
+ message(STATUS "LTO enabled")
+ else()
+ message(STATUS "LTO disabled (not supported by the compiler and/or linker)")
+ endif()
+ endif()
+
+ # Enable LTO flags if found, except for Debug builds
+ if (PYBIND11_LTO_CXX_FLAGS)
+ target_compile_options(${target_name} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:${PYBIND11_LTO_CXX_FLAGS}>")
+ endif()
+ if (PYBIND11_LTO_LINKER_FLAGS)
+ target_link_libraries(${target_name} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:${PYBIND11_LTO_LINKER_FLAGS}>")
+ endif()
+endfunction()
+
# Build a Python extension module:
-# pybind11_add_module(<name> [MODULE | SHARED] [EXCLUDE_FROM_ALL] source1 [source2 ...])
+# pybind11_add_module(<name> [MODULE | SHARED] [EXCLUDE_FROM_ALL]
+# [NO_EXTRAS] [THIN_LTO] source1 [source2 ...])
#
function(pybind11_add_module target_name)
- set(lib_type "MODULE")
- set(do_lto True)
- set(exclude_from_all "")
- set(sources "")
-
- set(_args_to_try "${ARGN}")
- foreach(_ex_arg IN LISTS _args_to_try)
- if(${_ex_arg} STREQUAL "MODULE")
- set(lib_type "MODULE")
- elseif(${_ex_arg} STREQUAL "SHARED")
- set(lib_type "SHARED")
- elseif(${_ex_arg} STREQUAL "EXCLUDE_FROM_ALL")
- set(exclude_from_all "EXCLUDE_FROM_ALL")
- else()
- list(APPEND sources "${_ex_arg}")
- endif()
- endforeach()
+ set(options MODULE SHARED EXCLUDE_FROM_ALL NO_EXTRAS THIN_LTO)
+ cmake_parse_arguments(ARG "${options}" "" "" ${ARGN})
+
+ if(ARG_MODULE AND ARG_SHARED)
+ message(FATAL_ERROR "Can't be both MODULE and SHARED")
+ elseif(ARG_SHARED)
+ set(lib_type SHARED)
+ else()
+ set(lib_type MODULE)
+ endif()
- add_library(${target_name} ${lib_type} ${exclude_from_all} ${sources})
+ if(ARG_EXCLUDE_FROM_ALL)
+ set(exclude_from_all EXCLUDE_FROM_ALL)
+ endif()
+
+ add_library(${target_name} ${lib_type} ${exclude_from_all} ${ARG_UNPARSED_ARGUMENTS})
target_include_directories(${target_name}
PRIVATE ${PYBIND11_INCLUDE_DIR} # from project CMakeLists.txt
@@ -85,56 +154,44 @@ function(pybind11_add_module target_name)
# import time.
target_link_libraries(${target_name} PRIVATE "-undefined dynamic_lookup")
+
+ if(ARG_SHARED)
+ # Suppress CMake >= 3.0 warning for shared libraries
+ set_target_properties(${target_name} PROPERTIES MACOSX_RPATH ON)
+ endif()
endif()
select_cxx_standard()
if(NOT MSVC)
# Make sure C++11/14 are enabled
target_compile_options(${target_name} PUBLIC ${PYBIND11_CPP_STANDARD})
+ endif()
- # Enable link time optimization and set the default symbol
- # visibility to hidden (very important to obtain small binaries)
- string(TOUPPER "${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()
+ if(ARG_NO_EXTRAS)
+ return()
+ 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(${target_name} PRIVATE -ipo)
- endif()
- endif()
+ _pybind11_add_lto_flags(${target_name} ${ARG_THIN_LTO})
+
+ if (NOT MSVC AND NOT ${CMAKE_BUILD_TYPE} MATCHES Debug)
+ # Set the default symbol visibility to hidden (very important to obtain small binaries)
+ target_compile_options(${target_name} PRIVATE "-fvisibility=hidden")
- # Default symbol visibility
- target_compile_options(${target_name} PRIVATE "-fvisibility=hidden")
-
- # 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()
+ # 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} -x $<TARGET_FILE:${target_name}>)
+ else()
+ add_custom_command(TARGET ${target_name} POST_BUILD
+ COMMAND ${CMAKE_STRIP} $<TARGET_FILE:${target_name}>)
endif()
endif()
- elseif(MSVC)
+ endif()
+
+ if(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()
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 10:22:32 +0000