I should add that I see the same problem if I execute... make -k check RUNTESTFLAGS='--target_board "unix{,-m32}"'
...from the toplevel of the linux_obj directory on gcc trunk built on a x86_64 Fedora Core 5 machine. The behavior is the same as on darwin. If I execute the above command from the gcc subdirectory, the make check completes. This is preventing any testing of the the libraries in gcc for -m32 on x86_64 or -m64 on Darwin ppc. Jack