The problem is that last step: it takes a LONG time to build libjava,
for example. If I make a change that I need to give a sanity check to,
I want to compile GCC with it, but not all the other additional code: that's
for a later state in the development/testing cycle. Since building a stage
of GCC is about three times faster than "other target libraries", if there's
no way to suppress that, the time to do this test goes up by a factor of four.
Would you feel OK if there were a make target to do a bootstrap
without building the other target libraries? The change from today's
bootstrap with --disable-bootstrap would be that it would build
libiberty, libcpp, and friends at each stage, rather than only once.