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- macro(SDL_DetectCompiler)
- set(USE_CLANG FALSE)
- set(USE_GCC FALSE)
- set(USE_INTELCC FALSE)
- set(USE_QCC FALSE)
- if(CMAKE_C_COMPILER_ID MATCHES "Clang|IntelLLVM")
- set(USE_CLANG TRUE)
- # Visual Studio 2019 v16.2 added support for Clang/LLVM.
- # Check if a Visual Studio project is being generated with the Clang toolset.
- if(MSVC)
- set(MSVC_CLANG TRUE)
- endif()
- elseif(CMAKE_COMPILER_IS_GNUCC)
- set(USE_GCC TRUE)
- elseif(CMAKE_C_COMPILER_ID MATCHES "^Intel$")
- set(USE_INTELCC TRUE)
- elseif(CMAKE_C_COMPILER_ID MATCHES "QCC")
- set(USE_QCC TRUE)
- endif()
- endmacro()
- function(SDL_AddCommonCompilerFlags TARGET)
- option(SDL_WERROR "Enable -Werror" OFF)
- if(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QCC)
- if(MINGW)
- # See if GCC's -gdwarf-4 is supported
- # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101377 for why this is needed on Windows
- cmake_push_check_state()
- check_c_compiler_flag("-gdwarf-4" HAVE_GDWARF_4)
- if(HAVE_GDWARF_4)
- target_compile_options(${TARGET} PRIVATE "-gdwarf-4")
- endif()
- cmake_pop_check_state()
- endif()
- # Check for -Wall first, so later things can override pieces of it.
- # Note: clang-cl treats -Wall as -Weverything (which is very loud),
- # /W3 as -Wall, and /W4 as -Wall -Wextra. So: /W3 is enough.
- check_c_compiler_flag(-Wall HAVE_GCC_WALL)
- if(MSVC_CLANG)
- target_compile_options(${TARGET} PRIVATE "/W3")
- elseif(HAVE_GCC_WALL)
- target_compile_options(${TARGET} PRIVATE "-Wall")
- if(HAIKU)
- target_compile_options(${TARGET} PRIVATE "-Wno-multichar")
- endif()
- endif()
- check_c_compiler_flag(-Wundef HAVE_GCC_WUNDEF)
- if(HAVE_GCC_WUNDEF)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Wundef>")
- endif()
- check_c_compiler_flag(-fno-strict-aliasing HAVE_GCC_NO_STRICT_ALIASING)
- if(HAVE_GCC_NO_STRICT_ALIASING)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-fno-strict-aliasing>")
- endif()
- check_c_compiler_flag(-Wdocumentation HAVE_GCC_WDOCUMENTATION)
- if(HAVE_GCC_WDOCUMENTATION)
- if(SDL_WERROR)
- check_c_compiler_flag(-Werror=documentation HAVE_GCC_WERROR_DOCUMENTATION)
- if(HAVE_GCC_WERROR_DOCUMENTATION)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Werror=documentation>")
- endif()
- endif()
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Wdocumentation>")
- endif()
- check_c_compiler_flag(-Wdocumentation-unknown-command HAVE_GCC_WDOCUMENTATION_UNKNOWN_COMMAND)
- if(HAVE_GCC_WDOCUMENTATION_UNKNOWN_COMMAND)
- if(SDL_WERROR)
- check_c_compiler_flag(-Werror=documentation-unknown-command HAVE_GCC_WERROR_DOCUMENTATION_UNKNOWN_COMMAND)
- if(HAVE_GCC_WERROR_DOCUMENTATION_UNKNOWN_COMMAND)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Werror=documentation-unknown-command>")
- endif()
- endif()
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Wdocumentation-unknown-command>")
- endif()
- check_c_compiler_flag(-fcomment-block-commands=threadsafety HAVE_GCC_COMMENT_BLOCK_COMMANDS)
- if(HAVE_GCC_COMMENT_BLOCK_COMMANDS)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-fcomment-block-commands=threadsafety>")
- else()
- check_c_compiler_flag(/clang:-fcomment-block-commands=threadsafety HAVE_CLANG_COMMENT_BLOCK_COMMANDS)
- if(HAVE_CLANG_COMMENT_BLOCK_COMMANDS)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:/clang:-fcomment-block-commands=threadsafety>")
- endif()
- endif()
- check_c_compiler_flag(-Wshadow HAVE_GCC_WSHADOW)
- if(HAVE_GCC_WSHADOW)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Wshadow>")
- endif()
- check_c_compiler_flag(-Wunused-local-typedefs HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
- if(HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-local-typedefs>")
- endif()
- endif()
- if(SDL_WERROR)
- if(MSVC)
- check_c_compiler_flag(/WX HAVE_WX)
- if(HAVE_WX)
- target_compile_options(${TARGET} PRIVATE "/WX")
- endif()
- elseif(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QNX)
- check_c_compiler_flag(-Werror HAVE_WERROR)
- if(HAVE_WERROR)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-Werror>")
- endif()
- endif()
- endif()
- if(USE_CLANG)
- check_c_compiler_flag("-fcolor-diagnostics" COMPILER_SUPPORTS_FCOLOR_DIAGNOSTICS)
- if(COMPILER_SUPPORTS_FCOLOR_DIAGNOSTICS)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-fcolor-diagnostics>")
- endif()
- else()
- check_c_compiler_flag("-fdiagnostics-color=always" COMPILER_SUPPORTS_FDIAGNOSTICS_COLOR_ALWAYS)
- if(COMPILER_SUPPORTS_FDIAGNOSTICS_COLOR_ALWAYS)
- target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:-fdiagnostics-color=always>")
- endif()
- endif()
- endfunction()
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