https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112873
--- Comment #24 from anlauf at gcc dot gnu.org ---
(In reply to Jerry DeLisle from comment #23)
> I am going to suggest the following. The wording was confusing around the
> functionality of the option vs the intrinsics. Hope this is OK?
>
> @opindex @code{fdec-math}
> @item -fdec-math
> Obsolete flag. The purpose of this option was to
> enable legacy math intrinsics such as COTAN and degree-valued trigonometric
> functions (e.g. TAND, ATAND, etc...) for compatibility with older code. This
> option is no longer operable. The trigonometric functions are now either
> part of Fortran 2023 or GNU extensions.
I am not a native speaker, so this is certainly better than what I wrote.
