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# Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cmake-common" project.
# For details, see https://github.com/egor-tensin/cmake-common.
# Distributed under the MIT License.
# It's a CMake code snippet I use in all of my CMake projects.
# It makes targets link the runtime statically by default, strips debug symbols
# in release builds and sets a couple of useful compilation options.
# Add this to the top-level CMakeLists.txt (unless a higher version has already
# been specified):
#
# cmake_minimum_required(VERSION 3.1)
# Without this policy set, this line:
#
# if(toolset STREQUAL "MSVC")
#
# evaluates to false even when using Visual Studio (since MSVC is a predefined
# variable; it's completely bonkers).
if(NOT POLICY CMP0054)
message(FATAL_ERROR "common.cmake uses CMP0054, which is unsupported by this CMake version")
endif()
cmake_policy(SET CMP0054 NEW)
# Toolset identification:
if(CMAKE_C_COMPILER_ID)
set(toolset "${CMAKE_C_COMPILER_ID}")
elseif(CMAKE_CXX_COMPILER_ID)
set(toolset "${CMAKE_CXX_COMPILER_ID}")
else()
set(toolset "unknown")
endif()
if(toolset STREQUAL "GNU")
set(is_gcc ON)
elseif(toolset STREQUAL "MSVC")
set(is_msvc ON)
else()
message(WARNING "Unrecognized toolset: ${toolset}")
endif()
# User-defined switches:
set(default_value ON)
get_directory_property(parent_dir PARENT_DIRECTORY)
if(parent_dir)
set(default_value OFF)
endif()
if(NOT DEFINED CC_CXX_STANDARD)
set(CC_CXX_STANDARD "14" CACHE STRING "C++ standard version")
endif()
if(NOT DEFINED CC_BEST_PRACTICES)
option(CC_BEST_PRACTICES "Set common compiler options" "${default_value}")
endif()
if(NOT DEFINED CC_WINDOWS_DEF)
option(CC_WINDOWS_DEF "Define useful Windows macros" "${default_value}")
endif()
if(NOT DEFINED CC_STATIC_RUNTIME)
set(static_runtime_default_value "${default_value}")
if(DEFINED Boost_USE_STATIC_LIBS AND NOT Boost_USE_STATIC_LIBS)
# Linking to dynamic Boost libs and the static runtime is a no-no:
set(static_runtime_default_value OFF)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows" OR MINGW)
else()
# At this point, Linux-like environment & the GNU C Library are assumed.
set(static_runtime_default_value OFF)
endif()
option(CC_STATIC_RUNTIME "Link the runtime statically" "${static_runtime_default_value}")
endif()
if(NOT DEFINED CC_STRIP_SYMBOLS)
option(CC_STRIP_SYMBOLS "Strip debug symbols" "${default_value}")
endif()
option(Boost_USE_STATIC_LIBS "Use the static Boost libraries" "${default_value}")
option(Boost_USE_STATIC_RUNTIME "Use Boost libraries linked to the runtime statically" "${CC_STATIC_RUNTIME}")
if(NOT parent_dir)
message(STATUS "Toolset: ${toolset}")
message(STATUS "C++ standard: ${CC_CXX_STANDARD}")
message(STATUS "Set common compiler options: ${CC_BEST_PRACTICES}")
message(STATUS "Define useful Windows macros: ${CC_WINDOWS_DEF}")
message(STATUS "Use the static Boost libraries: ${Boost_USE_STATIC_LIBS}")
message(STATUS "Link the runtime statically: ${CC_STATIC_RUNTIME}")
message(STATUS "Strip symbols: ${CC_STRIP_SYMBOLS}")
endif()
# C++ standard version:
set(CMAKE_CXX_STANDARD "${CC_CXX_STANDARD}")
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Common compiler options routines:
function(_cc_best_practices_msvc target)
set(compile_options /MP /W4)
get_target_property(target_type "${target}" TYPE)
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY" AND NOT aliased)
target_compile_options("${target}" PRIVATE ${compile_options})
endif()
endfunction()
function(_cc_best_practices_gcc target)
set(compile_options -Wall -Wextra)
get_target_property(target_type "${target}" TYPE)
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY" AND NOT aliased)
target_compile_options("${target}" PRIVATE ${compile_options})
endif()
endfunction()
function(_cc_best_practices target)
if(is_msvc)
_cc_best_practices_msvc("${target}")
elseif(is_gcc)
_cc_best_practices_gcc("${target}")
endif()
endfunction()
# Useful Windows macros routines:
function(_cc_common_windows_definitions target)
set(compile_definitions WIN32_LEAN_AND_MEAN NOMINMAX)
get_target_property(target_type "${target}" TYPE)
if(target_type STREQUAL "INTERFACE_LIBRARY")
target_compile_definitions("${target}" INTERFACE ${compile_definitions})
else()
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT aliased)
target_compile_definitions("${target}" PRIVATE ${compile_definitions})
endif()
endif()
endfunction()
# Static runtime routines:
function(_cc_static_runtime_msvc target)
get_target_property(target_type "${target}" TYPE)
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY" AND NOT aliased)
target_compile_options("${target}" PRIVATE
$<$<CONFIG:Debug>:/MTd>
$<$<NOT:$<CONFIG:Debug>>:/MT>)
endif()
endfunction()
function(_cc_static_runtime_gcc target)
get_target_property(target_type "${target}" TYPE)
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY" AND NOT aliased)
# This causes issues with mixing keyword- and plain- versions of
# target_link_libraries:
#target_link_libraries("${target}" PRIVATE -static)
set_property(TARGET "${target}" APPEND_STRING PROPERTY LINK_FLAGS " -static")
# Or (haven't tested this), if CMake 3.13+ is used:
#target_link_options("${target}" PRIVATE -static)
endif()
endfunction()
function(_cc_static_runtime target)
if(is_msvc)
_cc_static_runtime_msvc("${target}")
elseif(is_gcc)
_cc_static_runtime_gcc("${target}")
endif()
endfunction()
# Symbol stripping routines:
function(_cc_strip_symbols_gcc target)
get_target_property(target_type "${target}" TYPE)
get_target_property(aliased "${target}" ALIASED_TARGET)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY" AND NOT aliased)
set(release_build $<OR:$<CONFIG:Release>,$<CONFIG:MinSizeRel>>)
if(release_build)
# This causes issues with mixing keyword- and plain- versions of
# target_link_libraries:
#target_link_libraries("${target}" PRIVATE -s)
set_property(TARGET "${target}" APPEND_STRING PROPERTY LINK_FLAGS " -s")
endif()
endif()
endfunction()
function(_cc_strip_symbols target)
if(is_gcc)
_cc_strip_symbols_gcc("${target}")
endif()
endfunction()
# Main macros:
function(_cc_apply_settings target)
if(TARGET "${target}")
get_target_property(target_imported "${target}" IMPORTED)
if(NOT target_imported)
if(CC_BEST_PRACTICES)
_cc_best_practices("${target}")
endif()
if(CC_WINDOWS_DEF)
_cc_common_windows_definitions("${target}")
endif()
if(CC_STRIP_SYMBOLS)
_cc_strip_symbols("${target}")
endif()
if(CC_STATIC_RUNTIME)
_cc_static_runtime("${target}")
endif()
endif()
endif()
endfunction()
if(NOT parent_dir)
macro(add_executable target)
_add_executable(${ARGV})
_cc_apply_settings("${target}")
endmacro()
macro(add_library target)
_add_library(${ARGV})
_cc_apply_settings("${target}")
endmacro()
endif()
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