rfc: macros accepting constructors

[Joern Rennecke]

>Aldy Hernandez <aldyh@redhat.com> writes:
>
>|> the cleanest solution i can think of is modifying the preprocessor to
>|> allow grouping with curlies as well.

Andreas Schwab:

>That would not be compliant with the C standard.

It would if that grouping is only enabled for macros that are
defined in a way that is non-standard or invokes implementation-defined
behaviour.
E.g. we could precede the macro definition with a
#pragma gcc initializer_argument ,
or have some funky syntax for the macro definition, like:

#define foo({x}) bar((x))

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