bootstrap compiles C files twice

[Glenn Morris]

make bootstrap compiles all thes src/*.c files twice over (at least it
does for me).

In the top-level Makefile, bootstrap-build does:

(cd src; $(MAKE) $(MFLAGS) bootstrap)

which compiles them all once, before compiling the lisp files. Then it does:

(cd src; $(MAKE) $(MFLAGS) mostlyclean)

which deletes temacs, *.o, and some other stuff. Then it does:

$(MAKE) $(MFLAGS) all

which requires temacs and so causes all the .o files to be rebuilt.
(Even if temacs is retained at this point, some time-stamping seems to
cause it to need a spurious rebuild, but that is probably a separate
issue.)

Can anyone explain why `mostlyclean' is called after compiling the
lisp files? Things seem to work fine (and obviously more quickly)
without doing this.


Thanks.