From 3e4b3ada5e674fc77e5220c5ed0a913cd25103ce Mon Sep 17 00:00:00 2001
From: David Sidrane <David.Sidrane@NscDg.com>
Date: Wed, 14 Jul 2021 15:40:40 -0700
Subject: [PATCH] syslog:syslog_channel:Fix compiler warnings

   syslog_channel.c:98:8: error: unknown type name 'sem_t'
   syslog/syslog_channel.c:99:14: error: 'g_syslog_default_sem'
   defined but not used
---
 drivers/syslog/syslog_channel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/syslog/syslog_channel.c b/drivers/syslog/syslog_channel.c
index c05c4ba1df..bff3d8d1cc 100644
--- a/drivers/syslog/syslog_channel.c
+++ b/drivers/syslog/syslog_channel.c
@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <assert.h>
 #include <errno.h>
+#include <semaphore.h>
 
 #include <nuttx/syslog/syslog.h>
 #include <nuttx/compiler.h>
@@ -95,7 +96,9 @@ static struct syslog_channel_s g_rpmsg_channel =
 #endif
 
 #if defined(CONFIG_SYSLOG_DEFAULT)
+#  if defined(CONFIG_ARCH_LOWPUTC)
 static sem_t g_syslog_default_sem = SEM_INITIALIZER(1);
+#  endif
 
 static const struct syslog_channel_ops_s g_default_channel_ops =
 {