While building ports in a poudriere jail defining WITH_DEBUG I had the need to disable debug for specific ports failing to build due to requiring too much RAM for debugging build (llvm, for example).
I discovered that most ports who check for WITH_DEBUG are ignoring WITHOUT_DEBUG.
Also, the same intended effect of the WITHOUT_DEBUG flag can be obtained by using ".undef WITH_DEBUG" without requiring port Makefiles to have any special support.
I'm updating the patch in this review with one to completely remove WITHOUT_DEBUG from the ports tree.
I'm also adding an UPDATING note to let users have at least some notice.