Should structure with flexible array be allowed to be passed by value?

[H.J. Lu]

Gcc supports zero-length array:

http://gcc.gnu.org/onlinedocs/gcc-4.3.3/gcc/Zero-Length.html#Zero-Length

Should

struct line {
       int length;
       char contents[0];
 };

or

struct line {
       int length;
       char contents[];
 };

be allowed to be passed by value? If yes, how do you access the contents field?


-- 
H.J.