Re: __CONCAT

[Robert Millan <rmh@aybabtu.com>]

On Mon, Mar 20, 2006 at 04:03:21PM +0100, Petr Salinger wrote:
> >
> >Anyone has an idea on why gcc only expands __CONCAT once?
> 
> I think it is due to 
> http://developer.apple.com/documentation/developertools/gcc-4.0.1/cpp/Argument-Prescan.html
> 
> "If an argument is stringified or concatenated, the prescan does not occur."
> 
> As original FreeBSD <sys/cdefs.h> have
> 
> #define __CONCAT1(x,y)  x ## y
> #define __CONCAT(x,y)   __CONCAT1(x,y)
> 
> the solution for libfreebsd might be to put at the end of <bsd/cdefs.h>
> 
> #undef __CONCAT
> #define __CONCAT1(x,y)  x ## y
> #define __CONCAT(x,y)   __CONCAT1(x,y)

The header in question is using the standard (glibc) <sys/cdefs.h>.  Do you
think we can fix it there? (I.e. with upstream consentment)

-- 
Robert Millan