I followed the above instructions and compiled AOSP after the update Error
error: declaration uses identifier '_FORTIFY_SOURCE', which is a reserved identifier [cert-dcl37-c,-warnings-as-errors]
error: declaration uses identifier '_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS', which is a reserved identifier [cert-dcl37-c,-warnings-as-errors]
note: this fix will not be applied because it overlaps with another fix
error: declaration uses identifier '__ANDROID_VNDK__', which is a reserved identifier [cert-dcl37-c,-warnings-as-errors]
note: this fix will not be applied because it overlaps with another fix
error: declaration uses identifier '__clang_analyzer__', which is a reserved identifier [cert-dcl37-c,-warnings-as-errors