cast, container_of, tlist: Fix warning with GCC 4.6: -Wunused-but-set-variable

ccan/cast/test/compile_fail-cast_const.c

@@ -18,6 +18,7 @@ int main(int argc, char *argv[])
 		*p = NULL;
 
 	uc = cast_const(char *, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_const2.c

@@ -18,6 +18,7 @@ int main(int argc, char *argv[])
 		**p = NULL;
 
 	uc = cast_const2(char **, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_const3.c

@@ -18,6 +18,7 @@ int main(int argc, char *argv[])
 		***p = NULL;
 
 	uc = cast_const3(char ***, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_signed-const.c

@@ -11,6 +11,7 @@ int main(int argc, char *argv[])
 		*p = NULL;
 
 	uc = cast_signed(unsigned char *, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_signed-sizesame.c

@@ -18,6 +18,7 @@ int main(int argc, char *argv[])
 
 	uc = cast_signed(unsigned char *, p);
 
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_signed.c

@@ -12,5 +12,6 @@ int main(int argc, char *argv[])
 		*p = NULL;
 
 	uc = cast_signed(unsigned char *, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }

ccan/cast/test/compile_fail-cast_static-2.c

@@ -12,6 +12,7 @@ int main(int argc, char *argv[])
 		*p = 0;
 
 	c = cast_static(char *, p);
+	(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_static-3.c

@@ -10,6 +10,7 @@ int main(int argc, char *argv[])
 		char *p = 0;
 
 	c = cast_static(char *, p);
+	(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }
 

ccan/cast/test/compile_fail-cast_static.c

@@ -12,5 +12,6 @@ int main(int argc, char *argv[])
 		x = 0;
 
 	c = cast_static(char, x);
+	(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }

ccan/container_of/test/compile_fail-types.c

@@ -17,5 +17,6 @@ int main(int argc, char *argv[])
 #else
 	foop = NULL;
 #endif
+	(void) foop; /* Suppress unused-but-set-variable warning. */
 	return intp == NULL;
 }

ccan/container_of/test/compile_fail-var-types.c

@@ -20,5 +20,6 @@ int main(int argc, char *argv[])
 #else
 	foop = NULL;
 #endif
+	(void) foop; /* Suppress unused-but-set-variable warning. */
 	return intp == NULL;
 }

ccan/tlist/test/compile_fail-tlist_for_each.c

@@ -28,6 +28,7 @@ int main(int argc, char *argv[])
 	tlist_init(&children);
 	tlist_add(&children, &child, list);
 
-	tlist_for_each(&children, c, list);
+	tlist_for_each(&children, c, list)
+		(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }

ccan/tlist/test/compile_fail-tlist_tail.c

@@ -31,5 +31,6 @@ int main(int argc, char *argv[])
 		      struct child,
 #endif
 		      list);
+	(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }

ccan/tlist/test/compile_fail-tlist_top.c

@@ -31,5 +31,6 @@ int main(int argc, char *argv[])
 		      struct child,
 #endif
 		      list);
+	(void) c; /* Suppress unused-but-set-variable warning. */
 	return 0;
 }