c and cpp mixed attempt

Sources/SDLSwift/CMakeLists.txt

@@ -1,7 +1,6 @@
 add_library(SDLSwift INTERFACE)
 set_property(TARGET SDLSwift PROPERTY Swift_MODULE_NAME "SDL3")
 
-target_compile_options(SDLSwift INTERFACE "$<$<COMPILE_LANGUAGE:Swift>:-cxx-interoperability-mode=default>")
 target_include_directories(SDLSwift INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")
 
 target_link_libraries(SDLSwift INTERFACE ${SDL3})

Sources/SDLSwift/module.modulemap

@@ -1,3 +1,3 @@
-module SDL3 {
+module SDL3 [extern_c] {
   header "shim.h"
 }