GCC fixes for warnings

GCC was more picky about prototypes for inlines being required.

The generate_listener.py script used incorrect printf formats and
was casting %f params to float, but printf casts all %f params to
double per the spec.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/simulator/simulator.cpp

@@ -363,6 +363,14 @@ static void usage()
 	PX4_WARN("Publish sensors combined: simulator start -p");
 }
 
+__BEGIN_DECLS
+extern int simulator_main(int argc, char *argv[]);
+extern void led_init(void);
+extern void led_on(int led);
+extern void led_off(int led);
+extern void led_toggle(int led);
+__END_DECLS
+
 extern "C" {
 
 int simulator_main(int argc, char *argv[])
@@ -418,13 +426,6 @@ int simulator_main(int argc, char *argv[])
 
 }
 
-__BEGIN_DECLS
-extern void led_init(void);
-extern void led_on(int led);
-extern void led_off(int led);
-extern void led_toggle(int led);
-__END_DECLS
-
 bool static _led_state[2] = { false , false };
 
 __EXPORT void led_init()

src/platforms/posix/drivers/tonealrmsim/tone_alarm.cpp

@@ -788,7 +788,8 @@ tone_alarm_main(int argc, char *argv[])
 				PX4_WARN("not enough memory memory");
 				return 1;
 			}
-			fread(buffer, sz, 1, fd);
+			// FIXME - Make GCC happy
+			if (fread(buffer, sz, 1, fd)) { }
 			/* terminate the string */
 			buffer[sz] = 0;
 			ret = play_string(buffer, true);

src/platforms/posix/px4_layer/work_lock.h

@@ -37,12 +37,14 @@
 #pragma once
 extern sem_t _work_lock[];
 
+inline void work_lock(int id);
 inline void work_lock(int id)
 {
 	//printf("work_lock %d\n", id);
 	sem_wait(&_work_lock[id]);
 }
 
+inline void work_unlock(int id);
 inline void work_unlock(int id)
 {
 	//printf("work_unlock %d\n", id);