[Bug c++/65547] Gcc not giving preprocessor error for invalid invocation of variadic macro

["eldlistmailingz at tropicsoft dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65547

--- Comment #6 from Edward Diener <eldlistmailingz at tropicsoft dot com> ---
(In reply to Jonathan Wakely from comment #4)
> (In reply to Edward Diener from comment #3)
> > Where do you get the idea that the standard doesn't require an error, it
> > requires a diagnostic message ?
> 
> 1.4 [intro.compliance], the text I quoted. Where do you get the idea it
> requires an error?

You are not following the C++ standard as specified by the section I quoted.
Does gcc just decide arbitrarily if it does not follow the C++ standard it can
either issue an error, warning, or diagnostic message. That is an odd way to
create a language compiler. Is not the idea of a compiler like gcc that it
should follow the C++ standard as to be a standard-conforming compiler, and if
the end-user writes C++ code that does not follow the C++ standard an error
should be issued by the compiler ?

I am clearly missing something here. The C++ standard, in the section/paragraph
I quoted, is saying that when a macro accepts variadic parameters as its final
parameter, some input, even if it is an argument consisting of no preprocessing
tokens, must be passed for the variadic parameter. In the example I gave, no
argument at all is being passed for the variadic parameter. If the invocation
had been VMACRO(1,) then there is no problem. But some argument must be passed.