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kern/38977: gcc variadic macro comma-deletion extension in sys/dev/ieee1394/if_fwip.c

>Number:         38977
>Category:       kern
>Synopsis:       gcc variadic macro comma-deletion extension in 
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 18 04:10:00 +0000 2008
>Originator:     Gregory McGarry
>Release:        -current
According to, it is a 
GCC extension to use ## inside variadic macros to permit variadic arguments 
from being omitted (comma-deletion)

#define eprintf(format, ...) fprintf (stderr, format, ## __VA_ARGS__)

and call it like this:

eprintf("only one argument");

Compile with c99 compiler.

Revert to using the standard FWIPDEBUG((...)) syntax that almost every other 
source file uses.  Or just use the FreeBSD defintition of FWIPDEBUG.

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