Hi,
I am not sure whether you are aware of Fedora’s mass-build test
of emerging gcc 5.0
(http://article.gmane.org/gmane.linux.redhat.fedora.devel/204517),
which resulted among many other failures with:
xiphos-4.0.0-3.fc22.src.rpm
this package failed to build because the limit of the
instantiation depth has been reached.
Blessings,
Matěj