On both x86_64-linux and powerpc64-linux, a --disable-shared bootstrap dies with linker errors when building libcc1.so. You can't build a shared library using objects from the static libstdc++ (or any other library built without -fpic/-fPIC).
OK, so there is a workaround, specify --disable-plugin too, but shouldn't this be automatic if --disable-shared is given? -- Alan Modra Australia Development Lab, IBM