egcs 1.03, sparc-sun-solaris2.6: notes on bootstrap

[Zack Weinberg]

Two things that might be good to mention in INSTALL docs:

- You must use GNU make.  Sun make doesn't like the Fortran makefile;
it complains about not knowing how to make `f/bad.c'.  If you
accidentally use Sun make, you have to delete the build tree and start
over or GNU make will have the same problem.

- Bootstrapping with gcc 2.7.2 configured for solaris2.5.1 gives a
bunch of strange warnings due to conflicts between the fixed includes
for 2.5.1 and the system headers for 2.6.  I think this is harmless,
but I'm not sure.  (Also it frightened my apprentice.)  Using Sun's
unbundled compiler works fine.

Will post test results when compile is done.

zw