sem_setprotocol: Handle a case of missing proxy for sem_setprotocol. Reorder so that (1) this error is avoided, and (2) >No proxy is needed if priority inheritance is not enabled.

sched/semaphore/Make.defs

@@ -37,10 +37,10 @@
 
 CSRCS += sem_destroy.c sem_wait.c sem_trywait.c sem_tickwait.c
 CSRCS += sem_timedwait.c sem_timeout.c sem_post.c sem_recover.c
-CSRCS += sem_reset.c sem_setprotocol.c sem_waitirq.c
+CSRCS += sem_reset.c sem_waitirq.c
 
 ifeq ($(CONFIG_PRIORITY_INHERITANCE),y)
-CSRCS += sem_initialize.c sem_holder.c
+CSRCS += sem_initialize.c sem_holder.c sem_setprotocol.c
 endif
 
 ifeq ($(CONFIG_SPINLOCK),y)

sched/semaphore/sem_setprotocol.c

@@ -46,6 +46,8 @@
 
 #include "semaphore/semaphore.h"
 
+#ifdef CONFIG_PRIORITY_INHERITANCE
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -95,7 +97,6 @@ int sem_setprotocol(FAR sem_t *sem, int protocol)
   switch (protocol)
     {
       case SEM_PRIO_NONE:
-#ifdef CONFIG_PRIORITY_INHERITANCE
         /* Disable priority inheritance */
 
         sem->flags |= PRIOINHERIT_FLAGS_DISABLE;
@@ -103,16 +104,13 @@ int sem_setprotocol(FAR sem_t *sem, int protocol)
         /* Remove any current holders */
 
         sem_destroyholder(sem);
-#endif
         return OK;
 
       case SEM_PRIO_INHERIT:
-#ifdef CONFIG_PRIORITY_INHERITANCE
         /* Enable priority inheritance (dangerous) */
 
         sem->flags &= ~PRIOINHERIT_FLAGS_DISABLE;
         return OK;
-#endif
 
       case SEM_PRIO_PROTECT:
         /* Not yet supported */
@@ -128,3 +126,5 @@ int sem_setprotocol(FAR sem_t *sem, int protocol)
   set_errno(errcode);
   return ERROR;
 }
+
+endif /* CONFIG_PRIORITY_INHERITANCE */