Richard> Well, as this only affects re-builds (?) in gcc/ it isn't
Richard> fatal (I just hit Ctrl-C and make again, that makes it work).
That seems very unsatisfying to me, especially because I can easily
reproduce the problem with 'make -j2 all'.
I think unpredictable hangs are much worse than manually maintaining
dependencies. We can always try again in a couple years, after a new
make is released.
I'm bootstrapping the reversion on a couple machines now. I will send
it before the end of the day.