Fix a C++ link issue: If constant strings used only in constructor, the don't get linked into the final executable

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4743 42af7a65-404d-4744-a932-0658087f49c3

3 files changed, 27 insertions, 10 deletions

diff --git a/NxWidgets/nxwm/include/cstartwindow.hxx b/NxWidgets/nxwm/include/cstartwindow.hxx
index b0cad6127..8b5fd92d3 100644
--- a/NxWidgets/nxwm/include/cstartwindow.hxx
+++ b/NxWidgets/nxwm/include/cstartwindow.hxx
@@ -85,6 +85,12 @@ namespace NxWM
     enum EStartWindowMessageOpcodes msgId;    /**< The message opcode */
     FAR void                       *instance; /**< Object instance. */
   };
+
+  /**
+   * The well-known name for the Start Window's message queue.
+   */
+
+  extern FAR const char *g_startWindowMqName;
   
   /**
    * This class is the the start window application.
diff --git a/NxWidgets/nxwm/src/cstartwindow.cxx b/NxWidgets/nxwm/src/cstartwindow.cxx
index 1c997fbb7..2b7ecbe66 100644
--- a/NxWidgets/nxwm/src/cstartwindow.cxx
+++ b/NxWidgets/nxwm/src/cstartwindow.cxx
@@ -1,5 +1,5 @@
 /********************************************************************************************
- * NxWidgets/nxwm/src/cnxconsole.cxx
+ * NxWidgets/nxwm/src/cstartwindow.cxx
  *
  *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -58,6 +58,16 @@
  ********************************************************************************************/
 
 /********************************************************************************************
+ * Global Data
+ ********************************************************************************************/
+
+/**
+ * The well-known name for the Start Window's message queue.
+ */
+
+FAR const char *NxWM::g_startWindowMqName = CONFIG_NXWM_STARTWINDOW_MQNAME;
+  
+/********************************************************************************************
  * CStartWindow Method Implementations
  ********************************************************************************************/
 
@@ -554,10 +564,10 @@ int CStartWindow::startWindow(int argc, char *argv[])
   attr.mq_msgsize = sizeof(struct SStartWindowMessage);
   attr.mq_flags   = 0;
 
-  mqd_t mqd = mq_open(CONFIG_NXWM_STARTWINDOW_MQNAME, O_RDONLY|O_CREAT, 0666, &attr);
+  mqd_t mqd = mq_open(g_startWindowMqName, O_RDONLY|O_CREAT, 0666, &attr);
   if (mqd == (mqd_t)-1)
     {
-      gdbg("ERROR: mq_open(%s) failed: %d\n", CONFIG_NXWM_STARTWINDOW_MQNAME, errno);
+      gdbg("ERROR: mq_open(%s) failed: %d\n", g_startWindowMqName, errno);
       return EXIT_FAILURE;
     }
 
@@ -573,12 +583,14 @@ int CStartWindow::startWindow(int argc, char *argv[])
       ssize_t nbytes = mq_receive(mqd, &msg,  sizeof(struct SStartWindowMessage), 0);
       if (nbytes < 0)
         {
+          int errval = errno;
+
           // EINTR is not an error.  The wait was interrupted by a signal and
           // we just need to try reading again.
 
-          if (errno != EINTR)
+          if (errval != EINTR)
             {
-              gdbg("ERROR: mq_receive failed: %d\n", errno);
+              gdbg("ERROR: mq_receive failed: %d\n", errval);
             }
         }
       while (nbytes < 0);
diff --git a/NxWidgets/nxwm/src/cwindowcontrol.cxx b/NxWidgets/nxwm/src/cwindowcontrol.cxx
index 2c575d35b..6c2144bad 100644
--- a/NxWidgets/nxwm/src/cwindowcontrol.cxx
+++ b/NxWidgets/nxwm/src/cwindowcontrol.cxx
@@ -77,10 +77,10 @@ CWindowControl::CWindowControl(FAR const NXWidgets::CWidgetStyle *style)
   attr.mq_msgsize = sizeof(struct SStartWindowMessage);
   attr.mq_flags   = 0;
 
-  m_mqd = mq_open(CONFIG_NXWM_STARTWINDOW_MQNAME, O_WRONLY|O_CREAT, 0666, &attr);
+  m_mqd = mq_open(g_startWindowMqName, O_WRONLY|O_CREAT, 0666, &attr);
   if (m_mqd == (mqd_t)-1)
     {
-      gdbg("ERROR: mq_open(%s) failed: %d\n", CONFIG_NXWM_STARTWINDOW_MQNAME, errno);
+      gdbg("ERROR: mq_open(%s) failed: %d\n", g_startWindowMqName, errno);
     }
 
   // Add ourself as the window callback
@@ -126,7 +126,6 @@ void CWindowControl::destroy(IApplication *app)
     {
       gdbg("ERROR: mq_send failed: %d\n", errno);
     }
-
 }
 
 /**
@@ -166,7 +165,7 @@ void CWindowControl::handleMouseEvent(void)
 
   struct SStartWindowMessage outmsg;
   outmsg.msgId    = MSGID_MOUSE_INPUT;
-  outmsg.instance = (FAR void *)static_cast<CWidgetControl*>(this);
+  outmsg.instance = (FAR void *)this;
 
   int ret = mq_send(m_mqd, &outmsg, sizeof(struct SStartWindowMessage),
                     CONFIG_NXWM_STARTWINDOW_MXMPRIO);
@@ -212,7 +211,7 @@ void CWindowControl::handleKeyboardEvent(void)
 
   struct SStartWindowMessage outmsg;
   outmsg.msgId    = MSGID_KEYBOARD_INPUT;
-  outmsg.instance = (FAR void *)static_cast<CWidgetControl*>(this);
+  outmsg.instance = (FAR void *)this;
 
   int ret = mq_send(m_mqd, &outmsg, sizeof(struct SStartWindowMessage),
                     CONFIG_NXWM_STARTWINDOW_MXMPRIO);