Bug#791170: libsigc++-2.0: library transition may be needed when GCC 5 is the default

[Matthias Klose]

Control: tags -1 + confirmed patch
Control: tags -1 - moreinfo
Control: severity -1 serious
Control: retitle -1 libsigc++-2.0: library transition is needed when GCC 5 is
the default

so the incompatibilities are found in the not instantiated templates? however
with a rebuilt library I also find the symbol
_ZNSt7__cxx1110_List_baseIN4sigc9slot_baseESaIS2_EE8_M_clearEv

patch at
http://launchpadlibrarian.net/213230342/libsigc%2B%2B-2.0_2.4.1-1_2.4.1-1ubuntu2.diff.gz