[C++] warn_synth considered obsolete

[Gabriel Dos Reis]

Mark Mitchell <mark@codesourcery.com> writes:


[...]

| > from cp/call.c:build_new_op().  That removal would make the switch
| > actually unused; consequently I propose to deprecate it.
| 
| There's no point in deprecating an option that isn't used for
| anything; we deprecate things only when we're leaving them
| operational, but warning users that they're going away.  In this case,
| I think it's fine to remove the code, but then you should also update
| the manual, the changes HTML page.  You should also make sure that the
| compiler still accepts the option.  (In that sense, the option would
| indeed be deprecated.)
| 
| Such a patch is OK, as it is a low-risk way of solving this regression.

OK. 

Out of curiosity, how many such options do we have around,
i.e. options silently accepted but doing nothing?

-- Gaby