Re: Unused parameter warnings

[Paul Eggert]

> -static size_t
> +static size_t _GL_ATTRIBUTE_PURE
>  gl_tree_size (gl_list_t list)

Although changes like these don't break anything, I generally don't bother doing 
them if only older GCCs warn about a missing attribute, under the theory that 
people stuck with older compilers can build with --disable-gcc-warnings and it 
lessens the maintenance burden if we don't bloat the code with obvious detail 
that a decent compiler should deduce automatically.