My attempts to build lilypond (or rather guile) with gub are stopped
in the `tools' stage since a few days due to a nasty crash in `ar' in
combination with its `LLVMgold.so' plugin on openSuSE 42.3, cf.
Finding the above cost me hours of investigation :-/ I now believe to
know how to circumvent the issue locally, namely by adding a link to
`liblto_plugin.so' (which comes with gcc) in `/usr/lib/bfd-plugins'
and modifying the `AR_FLAGS' (and/or `ARFLAGS') environment variable
to also hold a `--plugin=liblto_plugin.so' option. Will test that
I wonder whether it makes sense to add `binutils' to gub not only for
cross compilation but to the `tools' stage also. If we build that
with `--disable-plugins', the above issue should completely vanish...