Re: 'static' in array-size func parm

[Paul Eggert]

In looking into this I realized a couple of things.  First, I partially 
addressed this problem in 2006 in gnulib's AC_C_VARARRAYS macro (sorry, 
I forgot about this until today).  Second, the C standardization 
committee addressed it in a different way, in C11's __STDC_NO_VLA__ 
macro.  So just now I fixed gnulib to do things the C11 way.  RCS should 
be able to use the vararrays module of the updated gnulib, and then do 
something like this:

/* A function's argument must point to an array with at least N 
elements.
   Example: 'int main (int argc, char *argv[VLA_ELEMS (argc)]);'.  */
#ifdef __STDC_NO_VLA__
# define VLA_ELEMS(n)
#else
# define VLA_ELEMS(n) static n
#endif

I prefer the name VLA_ELEMS to ARSZ_FN_PARM, as it's shorter and more 
mnemonic to people who are used to the standard terminology.

It might be helpful to have a gnulib module that implements VLA_ELEMS, 
such as in the attached patch; what do you think?  (I haven't installed it.)

0001-vla-new-module.patch
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