[Bug c++/125775] Precompiled header is not used when -Wpedantic is enabled

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125775

--- Comment #6 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Udo Steinbach from comment #3)
> g++ -fmodules -std=c++26 -I"."  -c --compile-std-module
> ==> no output, gcm.cache/.../stdc++.h.gcm and gcm.cache/std.compat.gcm and
> gcm.cache/std.gcm generated

Also the -std=c++26 issue might already be fixed.