https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67056
--- Comment #4 from Henning Baldersheim <bal...@yahoo-inc.com> --- Using the -fsanitize-undefined caused this error. configretriever.cpp: info: running test suite 'configretriever.cpp' /home/y/include/c++/5.2.0/bits/unique_ptr.h:76:2: runtime error: execution reached a __builtin_unreachable() call make: *** [test] Error 1 While it works fine when not inlining the constructor.