Fix warnings

Author: pablogs9

rclc/complex_msg_publisher/main.c

@@ -12,7 +12,7 @@
 #define RCSOFTCHECK(fn) { rcl_ret_t temp_rc = fn; if((temp_rc != RCL_RET_OK)){printf("Failed status on line %d: %d. Continuing.\n",__LINE__,(int)temp_rc);}}
 
 
-void main(void)
+int main()
 {	
 	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/configuration_example/configured_publisher/main.c

@@ -25,7 +25,7 @@ void timer_callback(rcl_timer_t * timer, int64_t last_call_time)
 	}
 }
 
-void main(int argc, char * const argv[])
+int main(int argc, char * const argv[])
 {	
   	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/configuration_example/configured_subscriber/main.c

@@ -21,7 +21,7 @@ void subscription_callback(const void * msgin)
 	printf("Received: %d\n", msg->data);
 }
 
-void main(int argc, const char * const * argv)
+int main(int argc, const char * const * argv)
 {
   	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/int32_publisher/main.c

@@ -24,7 +24,7 @@ void timer_callback(rcl_timer_t * timer, int64_t last_call_time)
 	}
 }
 
-void main(void)
+int main()
 {	
 	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/int32_subscriber/main.c

@@ -19,7 +19,7 @@ void subscription_callback(const void * msgin)
 	printf("Received: %d\n", msg->data);
 }
 
-void main()
+int main()
 {
   	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/ping_pong/main.c

@@ -73,7 +73,7 @@ void pong_subscription_callback(const void * msgin)
 }
 
 
-void main()
+int main()
 {
 	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;

rclc/timer/main.c

@@ -12,11 +12,11 @@
 void timer_callback(rcl_timer_t * timer, int64_t last_call_time)
 {
   if (timer != NULL) {
-	  printf("Timer callback executed. Last time %d\n", last_call_time);
+	  printf("Timer callback executed. Last time %ld\n", last_call_time);
   }
 }
 
-void main(void)
+int main()
 {	
 	rcl_allocator_t allocator = rcl_get_default_allocator();
 	rclc_support_t support;