https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #13 from Leon Winter <winter-...@bfw-online.de> --- The incorrect warning is only displayed when using an optimization level better than none (-O0) (this applies to your testcase and my real-world code). Your minimized test case is already wrongfully blamed by gcc-4.8. My non-testcase real-world code (C++ in -O1 and -O2 and -O3) is even more exciting since g++-4.8 complains, g++-4.9 does not but g++-5 complains again. So there might be a recurring regression in place. I will try to track down the regression from 4.9 to 5.3 since it is the latest version.
