tests/local.supp

{
   macos valgrind 1
   Memcheck:Leak
   match-leak-kinds: possible
   fun:calloc
   fun:map_images_nolock
   ...
   fun:_dyld_objc_notify_register
   fun:_objc_init
   fun:_os_object_init
   fun:libdispatch_init
   fun:libSystem_initializer
   ...
}