[Bug c++/68948] G++ voluntarily removes a function call with terrible side effects

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68948

--- Comment #12 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Created attachment 37596
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37596&action=edit
better fix for gcc 7