I've been agitating on the mailing list. True cases of this seem to be fairly rare, and I have come up with a slightly more effective (but ridiculous) workaround: have the multiple target command create an archive of its output, and then each actual target depends on the archive and extracts itself from the archive.

There is yacc, as a fairly common standard case, and I find that quite a few of my homegrown tools for little languages fall into this category (e.g. translating a table into a header file, a source file, and a ruby script).