build: follow the Swift semantics for linking

The Foundation module is a public link target as that is re-exposed to
users of FoundationNetwork and FoundationXML.  Explicitly make the link
to Foundation `PUBLIC`.

Author: compnerd

Sources/FoundationNetworking/CMakeLists.txt

@@ -34,9 +34,11 @@ target_compile_definitions(FoundationNetworking PRIVATE
 target_compile_options(FoundationNetworking PUBLIC
   $<$<BOOL:${ENABLE_TESTING}>:-enable-testing>
   "SHELL:-Xcc -F${CMAKE_BINARY_DIR}")
-target_link_libraries(FoundationNetworking PRIVATE
-  Foundation
-  CFURLSessionInterface)
+target_link_libraries(FoundationNetworking
+  PRIVATE
+    CFURLSessionInterface
+  PUBLIC
+    Foundation)
 set_target_properties(FoundationNetworking PROPERTIES
   INSTALL_RPATH "$ORIGIN"
   Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift

Sources/FoundationXML/CMakeLists.txt

@@ -10,9 +10,11 @@ target_compile_definitions(FoundationXML PRIVATE
 target_compile_options(FoundationXML PUBLIC
   $<$<BOOL:${ENABLE_TESTING}>:-enable-testing>
   "SHELL:-Xcc -F${CMAKE_BINARY_DIR}")
-target_link_libraries(FoundationXML PRIVATE
-  Foundation
-  CFXMLInterface)
+target_link_libraries(FoundationXML
+  PRIVATE
+    CFXMLInterface
+  PUBLIC
+    Foundation)
 set_target_properties(FoundationXML PROPERTIES
   INSTALL_RPATH "$ORIGIN"
   Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift