libiberty.a ends up in /usr/lib (and the multilib in /usr/lib/ppc64)
This appears to be ignoring the "--enable-version-specific-runtime-libs" flags (which is honored AFAICT by all the other libs).
libiberty is not a runtime library.
Is this an installation bug ?
I don't think so.
or is there some reason that libiberty.a should be treated differently from, say, libssp.a?
libssp _is_ a runtime library. Runtime libraries are those that programs compiled with GCC are linked against. Libiberty is used for compiling GCC itself. I have no idea why it is installed by default. Segher