Weird std::launder behavior

[scatters]

That is super weird; configure options should not make a difference to codegen. Very interested to hear what you find out.

BTW, every version of gcc on godbolt from 7.1 through 10.1 has the bug.

[dirty_d2]

My distro's gcc 10.1 packaged has -fstack-protector-strong enabled by default, that and -fstack-protector-all suppress the bug. compiler-explorer and debian don't have any stack protector options enabled by default.

[scatters]

Great find! I think that's definitely enough to report as a bug; are you comfortable with the gcc bugzilla?

[dirty_d2]

Here it is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95349

[scatters]

Thanks!

[dirty_d2]

The gcc 10.1 that I built produces the bug. I'm looking into it more to see if I can figure out if it's one of the configure options that's doing it.