[Mesa-dev] void operation in glsl

[Liu Xin]

HI, list,

i don't understand why glsl source  have  so many 'cast to void' 
operations, like this.

ir_rvalue *
ast_node::hir(exec_list *instructions,
           struct _mesa_glsl_parse_state *state)
{
    (void) instructions;
    (void) state;

    return NULL;
}

i think it's totally void operation, do you guy just make gcc compiler 
happy?

thanks,
--lx