Re: FYI, recent gcc vs. glibc's `#define printf(...' vs texinfo-4.0b

[Nathan Sidwell]

Alexandre Oliva wrote:

> The problem is in the program that assumes any C standard function is
> not implemented as a macro.  The C Standard explicitly allows a number
> of functions to be implemented as preprocessor macros, and it doesn't
> allow preprocessor directives within macro expansions.
We have a problem here.
printf is a varadic function
in C89 there are no varadic macros
ergo, a programmer might reasonably deduce printf cannot be a macro

can the glibc behaviour be gated on STDC_VERSION?
#if !__STDC__ || __STDC_VERSION__ >= 199909 /* or whatever the right number is 
*/
#define printf(format, ...) (fprintf (stdout, format, __VA_ARGS__))
#endif

in C99 the case is different of course.

nathan

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