[Bug c/84293] system-header macro expansion location gives unexpected warning

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84293

--- Comment #1 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Created attachment 43380
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43380&action=edit
header file