[Bug c++/71442] [5/6/7 Regression] r232569 breaks -Wunused-*

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71442

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 38655
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38655&action=edit
gcc7-pr71442.patch

Untested fix.