Package: gcc-5 Version: 5.4.0-6 According to this buildd log
https://buildd.debian.org/status/fetch.php?pkg=liburcu&arch=alpha&ver=0.9.2-3&stamp=1467933496 attempting to build liburcu 0.9.2-3 on alpha makes gcc 5.4.0-6 crash with an internal compiler error (could not split insn). I don't have access to an alpha system, so I can't confirm the crash myself, but this should be simple to verify since the log has the preprocessed source that gcc outputs when it crashes.
