Avoiding statement with no effect warning

src/racket/gc/dbg_mlc.c

@@ -888,7 +888,6 @@ void GC_check_heap_block(struct hblk *hbp, word dummy)
 void GC_check_heap_proc(void)
 {
 #   ifndef SMALL_CONFIG
-      /* Ignore gcc no effect warning on the following.		*/
       GC_STATIC_ASSERT((sizeof(oh) & (GRANULE_BYTES - 1)) == 0);
       /* FIXME: Should we check for twice that alignment?	*/
 #   endif

src/racket/gc/include/private/gc_priv.h

@@ -1957,7 +1957,7 @@ void GC_err_puts(const char *s);
    This code works correctly (ugliness is to avoid "unused var" warnings) */
 # define GC_STATIC_ASSERT(expr) do { if (0) { char j[(expr)? 1 : -1]; j[0]='\0'; j[0]=j[0]; } } while(0)
 #else
-# define GC_STATIC_ASSERT(expr) sizeof(char[(expr)? 1 : -1])
+# define GC_STATIC_ASSERT(expr) (void) sizeof(char[(expr)? 1 : -1])
 #endif
 
 # if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)

src/racket/gc/new_hblk.c

@@ -181,7 +181,6 @@ void GC_new_hblk(size_t gran, int kind)
   struct hblk *h;	/* the new heap block			*/
   GC_bool clear = GC_obj_kinds[kind].ok_init;
 
-  /* Ignore gcc "no effect" warning on the following: */
   GC_STATIC_ASSERT((sizeof (struct hblk)) == HBLKSIZE);
   
   if (GC_debugging_started) clear = TRUE;

src/racket/gc/typd_mlc.c

@@ -343,8 +343,6 @@ void GC_init_explicit_typing(void)
     register int i;
     DCL_LOCK_STATE;
 
-    
-    /* Ignore gcc "no effect" warning.	*/
     GC_STATIC_ASSERT(sizeof(struct LeafDescriptor) % sizeof(word) == 0);
     LOCK();
     if (GC_explicit_typing_initialized) {