[Bug c++/61412] Warnings incorrectly suppressed when compiling previously preprocessed file

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61412

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Andreas Schwab from comment #6)
> May be a dup of bug 57201.

I think not: that one is about warnings appearing after preprocessing (and we
know why this happens). This one is about warnings disappearing (and we do not
know yet why this happens).