diff --git a/stdlib/cmake/modules/StdlibOptions.cmake b/stdlib/cmake/modules/StdlibOptions.cmake
index 6c8bd8b43f29f..a23f379e6486b 100644
--- a/stdlib/cmake/modules/StdlibOptions.cmake
+++ b/stdlib/cmake/modules/StdlibOptions.cmake
@@ -99,6 +99,13 @@ option(SWIFT_STDLIB_EMIT_API_DESCRIPTORS
         "Emit api descriptors for the standard library"
         FALSE)
 
+option(SWIFT_STDLIB_BUILD_ONLY_CORE_MODULES
+       "Build only the core subset of the standard library,
+       ignoring additional libraries such as Concurrency, Distributed and StringProcessing.
+       This is an option meant for internal configurations inside Apple
+       that need to build the standard libraries in chunks when constructing an SDK"
+       FALSE)
+
 if("${SWIFT_HOST_VARIANT_SDK}" IN_LIST SWIFT_DARWIN_PLATFORMS)
   set(SWIFT_STDLIB_ENABLE_PRESPECIALIZATION_default TRUE)
 elseif("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "LINUX")
diff --git a/stdlib/public/CMakeLists.txt b/stdlib/public/CMakeLists.txt
index 20364f2470d52..86115cbf8ea75 100644
--- a/stdlib/public/CMakeLists.txt
+++ b/stdlib/public/CMakeLists.txt
@@ -166,7 +166,12 @@ if(SWIFT_BUILD_STDLIB)
   add_subdirectory(stubs)
   add_subdirectory(core)
   add_subdirectory(SwiftOnoneSupport)
+endif()
 
+if(SWIFT_BUILD_STDLIB AND NOT SWIFT_STDLIB_BUILD_ONLY_CORE_MODULES)
+  # In some internal Apple configurations we have the need
+  # to build Core and Onone separately from the rest
+  # of the stdlib
   if(SWIFT_ENABLE_EXPERIMENTAL_DIFFERENTIABLE_PROGRAMMING)
     add_subdirectory(Differentiation)
   endif()