cross-builds failing

[Jeffrey A Law]

  In message < 199810131447.PAA17838@sun52.NIS.cambridge >you write:
  > Any particular reason?  (Other than finding the correct include files is 
  > problematical).
None other than finding the right include files.   Part of the problem is
newlib has include files scattered all over the newlib sources.

  > > Either something is including stdio and unistd unconditionally, or inhibi
  > t_libc
  > > is not being defined.
  > 
  > It isn't defined until about 10 lines later in the file.
It should have been defined on the command line.  See LIBGCC2_CFLAGS or
whatever it is.

  > Ah!  The arm ports are overriding LIBGCC2_CFLAGS.  I guess this was 
  > probably done before TARGET_LIBGCC2_CFLAGS was added and never fixed up.
Ah.  Yes.  I think TARGET_LIBGCC2_CFLAGS may have been invented for this
exact reason!

  > PS. It has always struck me as somewhat odd that gcc, which is supposedly 
  > an ANSI/ISO C compiler needs a Posix header file (unistd.h) and associated 
  > functions in order to compile its support library.
Yes, it's hokey.

Much of the braindamage can be traced back to assert.h, which gcc provides
for reasons I never understood.  A few other things have been added through
the years which want to use stdio.h (gcov & eh support), but at the heart
of the problem was the assert.h support code.

jeff