Fix CMake configuration

Author: lorentey

CMakeLists.txt

@@ -25,6 +25,18 @@ endif()
 include(CTest)
 include(SwiftSupport)
 
+set(ATOMICS_SWIFT_FLAGS)
+set(ATOMICS_C_FLAGS)
+
+if(CMAKE_Swift_COMPILER_VERSION VERSION_GREATER_EQUAL 5.9)
+  list(APPEND ATOMICS_SWIFT_FLAGS
+    "-enable-experimental-feature BuiltinModule"
+    "-DATOMICS_NATIVE_BUILTINS"
+    "-Xcc" "-DATOMICS_NATIVE_BUILTINS=1")
+  list(APPEND ATOMICS_C_FLAGS
+    "-DATOMICS_NATIVE_BUILTINS=1")
+endif()
+
 add_subdirectory(Sources)
 if(BUILD_TESTING)
   add_subdirectory(Tests)

Sources/Atomics/CMakeLists.txt

@@ -31,6 +31,9 @@ add_library(Atomics
 
 set_target_properties(Atomics PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
+target_compile_options(Atomics PUBLIC
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:${ATOMICS_SWIFT_FLAGS}>"
+  "$<$<COMPILE_LANGUAGE:C,CXX>:SHELL:${ATOMICS_C_FLAGS}>")  
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64")
   target_compile_options(Atomics PUBLIC
     "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xcc -mcx16>")

Sources/_AtomicsShims/CMakeLists.txt

@@ -11,6 +11,9 @@ add_library(_AtomicsShims STATIC
   src/_AtomicsShims.c)
 target_include_directories(_AtomicsShims PUBLIC
   include)
+target_compile_options(_AtomicsShims PUBLIC
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:${ATOMICS_SWIFT_FLAGS}>"
+  "$<$<COMPILE_LANGUAGE:C,CXX>:SHELL:${ATOMICS_C_FLAGS}>")  
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64")
   target_compile_options(_AtomicsShims PUBLIC
     "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xcc -mcx16>")