[PATCH]: PR fortran/33197, use MPC for complex "arc" functions

[Kaveh R. Ghazi]

From: "Janis Johnson" <janis187@us.ibm.com>

> See the folding tests in gcc.dg, like builtins-7.c.  Tests that are not
> run use { dg-do link } with calls to non-existent function link_error,
> causing a link error if the expression is not folded.  The end result
> is the same as checking that there are no calls to abort, but it's a bit
> easier to understand the test.  The same trick could be used in an
> executable self-checking test.

Sorry, what would that look like in fortran?

        Thanks,
        --Kaveh