[C++] warn_synth considered obsolete

[Jason Merrill]

On 02 Jan 2005 14:37:02 +0100, gcc@integrable-solutions.net wrote:

> While looking into PR C++/18644, it occurs to me that the option
> -Wsynth is no longer useful. 

Your proposal for fixing 18644 is to make -Wsynth useless.  I don't have
much of a problem with that, but I suspect that the user is probably using
it for a reason...

> First, the diagnostic does not make any sense to me.  Does anybody
> understand it, what it is trying to say and how it could have been
> useful?

A user back in 1995 (I think) was migrating from Cfront to g++; this
warning pointed out to them places where they needed to update their code.
Now that cfront is just a memory, the warning doesn't seem that relevant
today.

Jason