# This file contains compile flags and general build configuration for Quassel # # (C) 2014-2020 by the Quassel Project # # Redistribution and use is allowed according to the terms of the BSD license. # For details see the accompanying COPYING-CMAKE-SCRIPTS file. include(QuasselMacros) # Helper function to check for linker flag support include(CheckCXXCompilerFlag) function(check_and_set_linker_flag flag name outvar) cmake_push_check_state(RESET) set(CMAKE_REQUIRED_FLAGS "${flag}") check_cxx_compiler_flag("" LINKER_SUPPORTS_${name}) if (LINKER_SUPPORTS_${name}) set(${outvar} "${${outvar}} ${flag}" PARENT_SCOPE) endif() cmake_pop_check_state() endfunction() # General compile settings set(CMAKE_CXX_STANDARD 14) set(CMAKE_CXX_STANDARD_REQUIRED OFF) # Rely on compile features if standard is not supported set(CMAKE_CXX_EXTENSIONS OFF) # We like to be standard conform set(CMAKE_CXX_VISIBILITY_PRESET hidden) set(CMAKE_VISIBILITY_INLINES_HIDDEN ON) set(CMAKE_POSITION_INDEPENDENT_CODE ON) # For GCC and Clang, enable a whole bunch of warnings if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang") add_compile_options( -fdiagnostics-color=always -fexceptions -fno-common -Wall -Wextra -Wcast-align -Wformat-security -Wnon-virtual-dtor -Woverloaded-virtual -Wpedantic -Wundef -Wvla -Werror=return-type "$<$:-Werror>" -Wno-error=deprecated # Don't break on Qt upgrades -Wno-unknown-pragmas "$<$>:-U_FORTIFY_SOURCE;-D_FORTIFY_SOURCE=2>" ) # ssp is currently very broken on MinGW if(NOT MINGW) add_compile_options(-fstack-protector-strong) endif() # Check for and set linker flags check_and_set_linker_flag("-Wl,-z,relro" RELRO LINKER_FLAGS) check_and_set_linker_flag("-Wl,-z,now" NOW LINKER_FLAGS) check_and_set_linker_flag("-Wl,--as-needed" AS_NEEDED LINKER_FLAGS) check_and_set_linker_flag("-Wl,--enable-new-dtags" ENABLE_NEW_DTAGS LINKER_FLAGS) check_and_set_linker_flag("-Wl,--no-undefined" NO_UNDEFINED LINKER_FLAGS) set(CMAKE_EXE_LINKER_FLAGS "${LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}") set(CMAKE_MODULE_LINKER_FLAGS "${LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}") set(CMAKE_SHARED_LINKER_FLAGS "${LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}") elseif(MSVC) # Target Windows Vista add_definitions(-D_WIN32_WINNT=0x0600 -DWINVER=0x0600 -D_WIN32_IE=0x0600) # Various settings for the Windows API add_definitions(-DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -D_USE_MATH_DEFINES -DNOMINMAX) # Compile options add_compile_options( /EHsc "$<$:/WX>" ) # Increase warning level on MSVC # CMake puts /W3 in CMAKE_CXX_FLAGS which will be appended later, so we need to replace string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") # Silence annoying/useless warnings # C4127: conditional expression is constant set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4127") # C4244: 'identifier': conversion from 't1' to 't2', possible loss of data set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4244") # C4456: declaration of 'identifier' hides previous local declaration set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4456") # C4458: declaration of 'identifier' hides class member set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4458") # C4996: deprecation warnings set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4996") # Link against the correct version of the C runtime set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/NODEFAULTLIB:libcmt /DEFAULTLIB:msvcrt ${CMAKE_EXE_LINKER_FLAGS_RELEASE}") set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "/NODEFAULTLIB:libcmt /DEFAULTLIB:msvcrt ${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}") set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "/NODEFAULTLIB:libcmt /DEFAULTLIB:msvcrt ${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}") set(CMAKE_EXE_LINKER_FLAGS_DEBUG "/NODEFAULTLIB:libcmtd /DEFAULTLIB:msvcrtd ${CMAKE_EXE_LINKER_FLAGS_DEBUG}") else() # For other compilers, we rely on default settings (unless someone provides a good set of options; patches welcome!) message(WARNING "${CMAKE_CXX_COMPILER_ID} is not a supported C++ compiler.") endif() # Mac build stuff if (APPLE) set(CMAKE_OSX_ARCHITECTURES "x86_64") add_compile_options( -mmacosx-version-min=10.9 -stdlib=libc++ ) add_definitions(-DQT_MAC_USE_COCOA -D_DARWIN_C_SOURCE) endif() # Optionally, produce clazy warnings if(CMAKE_CXX_COMPILER_ID MATCHES "Clang") option(ENABLE_CLAZY "Enable Clazy warnings" OFF) if(ENABLE_CLAZY) set(CMAKE_CXX_COMPILE_OBJECT "${CMAKE_CXX_COMPILE_OBJECT} -Xclang -load -Xclang ClangLazy${CMAKE_SHARED_LIBRARY_SUFFIX} -Xclang -add-plugin -Xclang clang-lazy") endif() endif() # Append CMAKE_CXX_FLAGS, so our flags can be overwritten externally. process_cmake_cxx_flags()