Is there any "official" decision about the use of ISO/ANSI standard C
in NetBSD?

Not knowing about previous discussions (possibly flame wars) of this 
theme, I tend to recommend that new code is written according to Standard
C and that current code should be converted to standard C when revisions 
are done to various source files.

This could be applied to the kernel as well as to the user mode 
applications, and as we use gcc, we already have the compiler tools to do 
this.

One thing that we could start doing is to move multiple external 
declarations of the same functions and variables from the .c source files 
using them to header files, to guarantee that the same declaration is used
everywhere. When doing this I recommend using real prototypes instead of 
K&R function declarations.

I am aware of the fact that this is actually a non-negligible amount of 
work to do this, but if the principle is nailed down, we may start a slow 
but determined conversion of the NetBSD code to Standard C.

regards
Erik Bertelsen
UNI-C