On 03/20/2015 12:48 PM, Jakub Jelinek wrote:
On Fri, Mar 20, 2015 at 12:30:44PM -0400, Jason Merrill wrote:
On 03/11/2015 03:10 PM, Jakub Jelinek wrote:
__has_{cpp_,}attribute builtin macros are effectively function-like macros
taking one argument (and the ISO preprocessor expands macros in the argument
which is IMHO desirable), but the traditional preprocessor has been crashing
on them or reporting errors.
Why do we want ISO preprocessor behavior in this specific situation?
You mean that we would handle
#define U unused
#if __has_attribute(U)
int u __attribute__((unused));
#endif
differently between ISO and traditional preprocessing?
That would be surprising to users.
Why surprising? Don't users of the traditional preprocessor expect
traditional preprocessor behavior?
Jason
