Use linker set for libio initialization

Update #2408.

cpukit/libcsupport/Makefile.am

@@ -41,7 +41,6 @@ ASSOCIATION_C_FILES = src/assoclocalbyname.c \
 BASE_FS_C_FILES = src/base_fs.c src/mount.c src/unmount.c src/libio.c \
     src/mount-mgr.c src/mount-mktgt.c src/libio_init.c \
     src/privateenv.c \
-    src/libio_helper_null.c \
     src/libio_exit.c \
     src/open_dev_console.c src/__usrenv.c src/rtems_mkdir.c
 BASE_FS_C_FILES += src/uenvgetgroups.c

cpukit/libcsupport/include/rtems/libio.h

@@ -1337,13 +1337,6 @@ typedef struct {
 
 /** @} */
 
-/**
- * @brief RTEMS LibIO Initialization
- *
- * Called by BSP startup code to initialize the libio subsystem.
- */
-void rtems_libio_init(void);
-
 /**
  * @name External I/O Handlers
  */
@@ -1481,14 +1474,6 @@ static inline rtems_device_minor_number rtems_filesystem_dev_minor_t(
  */
 void rtems_filesystem_initialize( void );
 
-typedef void (*rtems_libio_helper)(void);
-
-extern const rtems_libio_helper rtems_libio_init_helper;
-
-extern const rtems_libio_helper rtems_libio_post_driver_helper;
-
-void rtems_libio_helper_null(void);
-
 void rtems_libio_post_driver(void);
 
 void rtems_libio_exit(void);

cpukit/libcsupport/src/libio_helper_null.c

@@ -1,30 +0,0 @@
-/**
- * @file
- *
- * @ingroup LibIO
- */
-
-/*
- * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
- *
- *  embedded brains GmbH
- *  Obere Lagerstr. 30
- *  82178 Puchheim
- *  Germany
- *  <rtems@embedded-brains.de>
- *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rtems.org/license/LICENSE.
- */
-
-#if HAVE_CONFIG_H
-  #include "config.h"
-#endif
-
-#include <rtems/libio.h>
-
-void rtems_libio_helper_null(void)
-{
-  /* Do nothing */
-}

cpukit/libcsupport/src/libio_init.c

@@ -32,6 +32,7 @@
 #include <stdlib.h>                     /* calloc() */
 
 #include <rtems/libio.h>                /* libio.h not pulled in by rtems */
+#include <rtems/sysinit.h>
 
 /*
  *  File descriptor Table Information
@@ -40,7 +41,7 @@
 rtems_id           rtems_libio_semaphore;
 rtems_libio_t     *rtems_libio_iop_freelist;
 
-void rtems_libio_init( void )
+static void rtems_libio_init( void )
 {
     rtems_status_code rc;
     uint32_t i;
@@ -81,3 +82,15 @@ void rtems_libio_init( void )
   if ( rc != RTEMS_SUCCESSFUL )
     rtems_fatal_error_occurred( rc );
 }
+
+RTEMS_SYSINIT_ITEM(
+  rtems_libio_init,
+  RTEMS_SYSINIT_LIBIO,
+  RTEMS_SYSINIT_ORDER_MIDDLE
+);
+
+RTEMS_SYSINIT_ITEM(
+  rtems_libio_post_driver,
+  RTEMS_SYSINIT_STD_FILE_DESCRIPTORS,
+  RTEMS_SYSINIT_ORDER_MIDDLE
+);