Please add the patch found in http://gcc.gnu.org/ml/gcc-patches/2006-01/msg01287.html to the gcc-4.1.0 patchseries. Without it, bootstrapping gcc-4.1.0 for SH4 fails with a segfault in 'fixproto' (crossdev, sh4 gcc stage 2).
Created attachment 85183 [details, diff] The patch mentioned in the URL
thanks, added to current patchset