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Add LTO and strip to pybind11_add_module

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This commit is contained in:
Dean Moldovan
2016-05-27 21:42:43 +02:00
parent 24ddf4b3f1
commit 9fb50c56d0
2 changed files with 51 additions and 71 deletions
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51
CMakeLists.txt
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@@ -59,14 +59,14 @@ function(pybind11_add_module target_name)
# missing symbols, but that's perfectly fine -- they will be resolved at
# import time.
if(MSVC)
target_link_libraries(${target_name} ${PYTHON_LIBRARIES})
target_link_libraries(${target_name} PRIVATE ${PYTHON_LIBRARIES})
elseif(APPLE)
# Make sure OS X does not have any issues with missing symbols
target_link_libraries(${target_name} PRIVATE "-undefined dynamic_lookup")
endif()
# Make sure C++11/14 are enabled
if(NOT MSVC)
# Make sure C++11/14 are enabled
check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
check_cxx_compiler_flag("-std=c++11" HAS_CPP11_FLAG)
@@ -78,11 +78,58 @@ function(pybind11_add_module target_name)
message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
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 ${U_CMAKE_BUILD_TYPE} MATCHES DEBUG)
# Check for Link Time Optimization support (GCC/Clang)
check_cxx_compiler_flag("-flto" HAS_LTO_FLAG)
if(HAS_LTO_FLAG)
target_compile_options(${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(${target_name} PRIVATE -ipo)
endif()
endif()
# Default symbol visibility
target_compile_options(${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()
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 ${target_name} APPEND_STRING PROPERTY LINK_FLAGS_RELWITHDEBINFO /LTCG)
endif()
endfunction()
# Compile with compiler warnings turned on
function(pybind11_turn_on_warnings target_name)
if(MSVC)
target_compile_options(${target_name} PRIVATE /W4)
else()
target_compile_options(${target_name} PRIVATE -Wall -Wextra)
endif()
endfunction()