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# Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
# 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)
# Otherwise 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)
set(toolset "${CMAKE_C_COMPILER_ID}")
elseif(CMAKE_CXX_COMPILER)
set(toolset "${CMAKE_CXX_COMPILER_ID}")
else()
set(toolset "unknown")
endif()
message(STATUS "Toolset: ${toolset}")
if(toolset STREQUAL "GNU")
set(is_gcc ON)
elseif(toolset STREQUAL "MSVC")
set(is_msvc ON)
else()
message(WARNING "Unrecognized toolset: ${toolset}")
endif()
# Compilation options almost always useful:
function(best_practices_msvc target)
set(compile_options /MP /W4)
set(compile_definitions WIN32_LEAN_AND_MEAN NOMINMAX)
get_target_property(target_type "${target}" TYPE)
if(target_type STREQUAL "INTERFACE_LIBRARY")
target_compile_definitions("${target}" INTERFACE ${compile_definitions})
else()
target_compile_options("${target}" PRIVATE ${compile_options})
target_compile_definitions("${target}" PRIVATE ${compile_definitions})
endif()
endfunction()
function(best_practices_gcc target)
set(compile_options -Wall -Wextra)
get_target_property(target_type "${target}" TYPE)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY")
target_compile_options("${target}" PRIVATE ${compile_options})
endif()
endfunction()
function(best_practices target)
if(is_msvc)
best_practices_msvc("${target}")
elseif(is_gcc)
best_practices_gcc("${target}")
endif()
endfunction()
# User-defined switches:
set(default_value ON)
get_directory_property(parent_directory PARENT_DIRECTORY)
if(parent_directory)
set(default_value OFF)
endif()
option(CC_BEST_PRACTICES "Apply useful compilation options" "${default_value}")
option(CC_STATIC_RUNTIME "Link the runtime statically" "${default_value}")
option(CC_STRIP_SYMBOLS "Strip debug symbols" "${default_value}")
set(CC_CXX_STANDARD "14" CACHE STRING "C++ standard version")
message(STATUS "Best practices: ${CC_BEST_PRACTICES}")
message(STATUS "Static runtime: ${CC_STATIC_RUNTIME}")
message(STATUS "Strip symbols: ${CC_STRIP_SYMBOLS}")
message(STATUS "C++ standard: ${CC_CXX_STANDARD}")
# C++ standard version:
set(CMAKE_CXX_STANDARD "${CC_CXX_STANDARD}")
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Static runtime routines:
function(static_runtime_msvc target)
get_target_property(target_type "${target}" TYPE)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY")
target_compile_options("${target}" PRIVATE
$<$<CONFIG:Debug>:/MTd>
$<$<NOT:$<CONFIG:Debug>>:/MT>)
endif()
endfunction()
function(static_runtime_gcc target)
get_target_property(target_type "${target}" TYPE)
if(target_type STREQUAL "EXECUTABLE")
target_link_libraries("${target}" PRIVATE -static)
endif()
endfunction()
function(static_runtime target)
if(is_msvc)
static_runtime_msvc("${target}")
elseif(is_gcc)
static_runtime_gcc("${target}")
endif()
endfunction()
# Symbol stripping routines:
function(strip_symbols_gcc target)
get_target_property(target_type "${target}" TYPE)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY")
set(release_build $<OR:$<CONFIG:Release>,$<CONFIG:MinSizeRel>>)
target_link_libraries("${target}" PRIVATE $<${release_build}:-s>)
endif()
endfunction()
function(strip_symbols target)
if(is_gcc)
strip_symbols_gcc("${target}")
endif()
endfunction()
# Main macros:
function(apply_common_settings target)
if(TARGET "${target}")
get_target_property(target_imported "${target}" IMPORTED)
if(NOT target_imported)
if(CC_BEST_PRACTICES)
best_practices("${target}")
endif()
if(CC_STRIP_SYMBOLS)
strip_symbols("${target}")
endif()
if(CC_STATIC_RUNTIME)
static_runtime("${target}")
endif()
endif()
endif()
endfunction()
macro(add_executable target)
_add_executable(${ARGV})
apply_common_settings("${target}")
endmacro()
macro(add_library target)
_add_library(${ARGV})
apply_common_settings("${target}")
endmacro()
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