[Bug tree-optimization/109717] -Warray-bound error with gnu++20 and fmt library

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109717

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Some of the warnings were always present, but suppressed unless you used
-Wsystem-headers

Now they're issued even when the "problem" is in a system header.

This is considered progress ;-)