Update to SDL3

1 files changed, 162 insertions, 0 deletions

diff --git a/src/contrib/SDL-3.2.20/cmake/sdlcompilers.cmake b/src/contrib/SDL-3.2.20/cmake/sdlcompilers.cmake
new file mode 100644
index 0000000..c3d8c47
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/cmake/sdlcompilers.cmake
@@ -0,0 +1,162 @@
+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$")
+    set(USE_INTELCC TRUE)
+  elseif(CMAKE_C_COMPILER_ID MATCHES "QCC")
+    set(USE_QCC TRUE)
+  endif()
+endmacro()
+
+function(sdl_target_compile_option_all_languages TARGET OPTION)
+  target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:${OPTION}>")
+  if(CMAKE_OBJC_COMPILER)
+    target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:OBJC>:${OPTION}>")
+  endif()
+endfunction()
+
+function(SDL_AddCommonCompilerFlags TARGET)
+  option(SDL_WERROR "Enable -Werror" OFF)
+
+  get_property(TARGET_TYPE TARGET "${TARGET}" PROPERTY TYPE)
+  if(MSVC)
+    cmake_push_check_state()
+    check_c_compiler_flag("/W3" COMPILER_SUPPORTS_W3)
+    if(COMPILER_SUPPORTS_W3)
+      target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:/W3>")
+    endif()
+    cmake_pop_check_state()
+  endif()
+
+  if(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QCC)
+    if(MINGW)
+      # See if GCC's -gdwarf-4 is supported
+      # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101377 for why this is needed on Windows
+      cmake_push_check_state()
+      check_c_compiler_flag("-gdwarf-4" HAVE_GDWARF_4)
+      if(HAVE_GDWARF_4)
+        target_compile_options(${TARGET} PRIVATE "$<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:-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(${TARGET} PRIVATE "/W3")
+    elseif(HAVE_GCC_WALL)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wall")
+      if(HAIKU)
+        sdl_target_compile_option_all_languages(${TARGET} "-Wno-multichar")
+      endif()
+    endif()
+
+    check_c_compiler_flag(-Wundef HAVE_GCC_WUNDEF)
+    if(HAVE_GCC_WUNDEF)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wundef")
+    endif()
+
+    check_c_compiler_flag(-Wfloat-conversion HAVE_GCC_WFLOAT_CONVERSION)
+    if(HAVE_GCC_WFLOAT_CONVERSION)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wfloat-conversion")
+    endif()
+
+    check_c_compiler_flag(-fno-strict-aliasing HAVE_GCC_NO_STRICT_ALIASING)
+    if(HAVE_GCC_NO_STRICT_ALIASING)
+      sdl_target_compile_option_all_languages(${TARGET} "-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)
+          sdl_target_compile_option_all_languages(${TARGET} "-Werror=documentation")
+        endif()
+      endif()
+      sdl_target_compile_option_all_languages(${TARGET} "-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)
+          sdl_target_compile_option_all_languages(${TARGET} "-Werror=documentation-unknown-command")
+        endif()
+      endif()
+      sdl_target_compile_option_all_languages(${TARGET} "-Wdocumentation-unknown-command")
+    endif()
+
+    check_c_compiler_flag(-fcomment-block-commands=threadsafety HAVE_GCC_COMMENT_BLOCK_COMMANDS)
+    if(HAVE_GCC_COMMENT_BLOCK_COMMANDS)
+      sdl_target_compile_option_all_languages(${TARGET} "-fcomment-block-commands=threadsafety")
+    else()
+      check_c_compiler_flag(/clang:-fcomment-block-commands=threadsafety HAVE_CLANG_COMMENT_BLOCK_COMMANDS)
+      if(HAVE_CLANG_COMMENT_BLOCK_COMMANDS)
+        sdl_target_compile_option_all_languages(${TARGET} "/clang:-fcomment-block-commands=threadsafety")
+      endif()
+    endif()
+
+    check_c_compiler_flag(-Wshadow HAVE_GCC_WSHADOW)
+    if(HAVE_GCC_WSHADOW)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wshadow")
+    endif()
+
+    check_c_compiler_flag(-Wunused-local-typedefs HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
+    if(HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wno-unused-local-typedefs")
+    endif()
+
+    check_c_compiler_flag(-Wimplicit-fallthrough HAVE_GCC_WIMPLICIT_FALLTHROUGH)
+    if(HAVE_GCC_WIMPLICIT_FALLTHROUGH)
+      sdl_target_compile_option_all_languages(${TARGET} "-Wimplicit-fallthrough")
+    endif()
+  endif()
+
+  if(SDL_WERROR)
+    if(MSVC)
+      check_c_compiler_flag(/WX HAVE_WX)
+      if(HAVE_WX)
+        target_compile_options(${TARGET} PRIVATE "$<$<COMPILE_LANGUAGE:C,CXX>:/WX>")
+      endif()
+    elseif(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QNX)
+      check_c_compiler_flag(-Werror HAVE_WERROR)
+      if(HAVE_WERROR)
+        sdl_target_compile_option_all_languages(${TARGET} "-Werror")
+      endif()
+
+      if(TARGET_TYPE STREQUAL "SHARED_LIBRARY")
+        check_linker_flag(C "-Wl,--no-undefined-version" LINKER_SUPPORTS_NO_UNDEFINED_VERSION)
+        if(LINKER_SUPPORTS_NO_UNDEFINED_VERSION)
+          target_link_options(${TARGET} PRIVATE "-Wl,--no-undefined-version")
+        endif()
+      endif()
+    endif()
+  endif()
+
+  if(USE_CLANG)
+    check_c_compiler_flag("-fcolor-diagnostics" COMPILER_SUPPORTS_FCOLOR_DIAGNOSTICS)
+    if(COMPILER_SUPPORTS_FCOLOR_DIAGNOSTICS)
+      sdl_target_compile_option_all_languages(${TARGET} "-fcolor-diagnostics")
+    endif()
+  else()
+    check_c_compiler_flag("-fdiagnostics-color=always" COMPILER_SUPPORTS_FDIAGNOSTICS_COLOR_ALWAYS)
+    if(COMPILER_SUPPORTS_FDIAGNOSTICS_COLOR_ALWAYS)
+      sdl_target_compile_option_all_languages(${TARGET} "-fdiagnostics-color=always")
+    endif()
+  endif()
+endfunction()