Fix for stack size checking on Solaris.

sql/mysqld.cc

@@ -2102,9 +2102,10 @@ int main(int argc, char **argv)
 #ifdef HAVE_PTHREAD_ATTR_GETSTACKSIZE
   {
     /* Retrieve used stack size;  Needed for checking stack overflows */
-    size_t stack_size;
+    size_t stack_size= 0;
     pthread_attr_getstacksize(&connection_attrib, &stack_size);
-    if (stack_size != thread_stack)
+    /* We must check if stack_size = 0 as Solaris 2.9 can return 0 here */
+    if (stack_size && stack_size != thread_stack)
     {
       if (global_system_variables.log_warnings)
 	sql_print_error("Warning: Asked for %ld thread stack, but got %ld",