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gcc tends to report the error message "cpp: too many input files" when
it cannot find tools in the places it expects them to be. One cause is if you configured
with a --prefix or a --exec-prefix argument with a trailing slash. You must ensure
there are no trailing slashes to the arguments to --prefix and --exec-prefix.
Another cause is if you have moved your gcc installation from the location you originally
specified when it was configured. This location is determined primarily by the
--exec-prefix argument to gcc's configure script.
More recent gcc snapshots do not have this limitation, which is specific to gcc 2.95.2
or earlier. To resolve it, you can: use a more recent gcc snapshot; reconfigure gcc
with the intended installation location set correctly; or set up symlinks from the
old location to the new one.
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eCos FAQ : 
Multiply defined symbols when target is built twice