[Bug pch/71622] gcc 5.3.1 crashes when it tries to compile qtbase [dev]

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71622

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
valgrind --track-origins=yes --trace-children=yes g++...
will probably also print a backtrace.