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Re: glibc 2.1.1pre2 breaks libstdc++-v3 build
On Fri, Jan 12, 2001 at 06:12:53PM +0000, Neil Booth wrote:
> Joseph S. Myers wrote:-
>
> > I'll also suggest that warnings about what ISO C99 requires make sense
> > only for C99-style variadic macros, not for GNU-style ones with named rest
> > arguments.
>
> OK, that's fair enough I think.
Careful. I want named rest arguments to be completely orthogonal to
all other extensions to varargs macros. This is because named rest
arguments have a good chance of being accepted for standardization,
but the others don't.
So the behavior of
#define printf(format, args...) fprintf(stdout, format, ##args)
should be _identical_ to
#define printf(format, ...) fprintf(stdout, format, ##__VA_ARGS__)
and IMO that includes the warnings it generates.
[Glibc should be doing
#define printf(args...) fprintf(stdout, args...)
which will DTRT with all versions of GCC that support varargs macros
at all.]
zw