build: enable cross-linking

Author: compnerd

cmake/modules/SwiftSupport.cmake

@@ -13,6 +13,7 @@ function(add_swift_target target)
 
   if(AST_TARGET)
     list(APPEND compile_flags -target;${AST_TARGET})
+    list(APPEND link_flags -target;${AST_TARGET})
   endif()
   if(AST_MODULE_NAME)
     list(APPEND compile_flags -module-name;${AST_MODULE_NAME})
@@ -25,6 +26,9 @@ function(add_swift_target target)
   if(AST_MODULE_CACHE_PATH)
     list(APPEND compile_flags -module-cache-path;${AST_MODULE_CACHE_PATH})
   endif()
+  if(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES RelWithDebInfo)
+    list(APPEND compile_flags -g)
+  endif()
   if(AST_SWIFT_FLAGS)
     foreach(flag ${AST_SWIFT_FLAGS})
       list(APPEND compile_flags ${flag})