diff --git a/mysys/stacktrace.c b/mysys/stacktrace.c
index 175ee8a3025..a3ccc3185ac 100644
--- a/mysys/stacktrace.c
+++ b/mysys/stacktrace.c
@@ -166,7 +166,7 @@ void my_print_stacktrace(uchar* stack_bottom __attribute__((unused)),
     my_safe_printf_stderr("%s",
       "Error when traversing the stack, stack appears corrupt.\n");
   else
-    my_safe_printf_stderr("%s"
+    my_safe_printf_stderr("%s",
       "Please read "
       "http://dev.mysql.com/doc/refman/5.1/en/resolve-stack-dump.html\n"
       "and follow instructions on how to resolve the stack trace.\n"
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 6cf173266ca..33dd94d99f2 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -2411,10 +2411,6 @@ static void check_data_home(const char *path)
 
 #endif /* __WIN__ */
 
-#ifdef HAVE_LINUXTHREADS
-#define UNSAFE_DEFAULT_LINUX_THREADS 200
-#endif
-
 
 #if BACKTRACE_DEMANGLE
 #include <cxxabi.h>
diff --git a/sql/signal_handler.cc b/sql/signal_handler.cc
index 27fcf741e2a..2cffd4c43e6 100644
--- a/sql/signal_handler.cc
+++ b/sql/signal_handler.cc
@@ -131,6 +131,7 @@ extern "C" sig_handler handle_fatal_signal(int sig)
     "Hope that's ok; if not, decrease some variables in the equation.\n\n");
 
 #if defined(HAVE_LINUXTHREADS)
+#define UNSAFE_DEFAULT_LINUX_THREADS 200
   if (sizeof(char*) == 4 && thread_count > UNSAFE_DEFAULT_LINUX_THREADS)
   {
     my_safe_printf_stderr(
diff --git a/storage/innobase/include/sync0rw.ic b/storage/innobase/include/sync0rw.ic
index 51cf7121b4c..f451ae24d59 100644
--- a/storage/innobase/include/sync0rw.ic
+++ b/storage/innobase/include/sync0rw.ic
@@ -90,7 +90,7 @@ rw_lock_set_waiter_flag(
 	rw_lock_t*	lock)	/*!< in/out: rw-lock */
 {
 #ifdef INNODB_RW_LOCKS_USE_ATOMICS
-	os_compare_and_swap_ulint(&lock->waiters, 0, 1);
+	(void) os_compare_and_swap_ulint(&lock->waiters, 0, 1);
 #else /* INNODB_RW_LOCKS_USE_ATOMICS */
 	lock->waiters = 1;
 #endif /* INNODB_RW_LOCKS_USE_ATOMICS */
@@ -107,7 +107,7 @@ rw_lock_reset_waiter_flag(
 	rw_lock_t*	lock)	/*!< in/out: rw-lock */
 {
 #ifdef INNODB_RW_LOCKS_USE_ATOMICS
-	os_compare_and_swap_ulint(&lock->waiters, 1, 0);
+	(void) os_compare_and_swap_ulint(&lock->waiters, 1, 0);
 #else /* INNODB_RW_LOCKS_USE_ATOMICS */
 	lock->waiters = 0;
 #endif /* INNODB_RW_LOCKS_USE_ATOMICS */
diff --git a/storage/myisam/mi_dynrec.c b/storage/myisam/mi_dynrec.c
index 6ebbe983938..6acee89b0a8 100644
--- a/storage/myisam/mi_dynrec.c
+++ b/storage/myisam/mi_dynrec.c
@@ -117,7 +117,7 @@ int mi_munmap_file(MI_INFO *info)
 {
   int ret;
   DBUG_ENTER("mi_unmap_file");
-  if ((ret= my_munmap(info->s->file_map, info->s->mmaped_length)))
+  if ((ret= my_munmap((void*) info->s->file_map, info->s->mmaped_length)))
     DBUG_RETURN(ret);
   info->s->file_read= mi_nommap_pread;
   info->s->file_write= mi_nommap_pwrite;