How exactly does one build libjava successfully?

[Zack Weinberg]

There are a couple of different things I would like to try out gcj
with, but I cannot successfully build libgcj.  On both HEAD and the
branch, with or without --enable-shared to configure, I get these link
errors:

./.libs/libgcj.so: undefined reference to `__eh_alloc@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__eh_free@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__throw@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__get_eh_info@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__get_eh_table_language@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__terminate@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__terminate_set_func@GCC_3.0'
./.libs/libgcj.so: undefined reference to `__rethrow@GCC_3.0'

Any clues would be appreciated.  This is i686-pc-linux-gnu.

zw