Do our best to show messages logged during program startup/shutdown.

Use wxMessageOutputBest to show them even under Windows where programs usually don't have stderr at all and also don't disable log target auto-creation during shutdown as it's arguably better to leak memory (which shouldn't matter much when the program is about to exit anyhow) than to not show possibly important messages.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61450 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/log.cpp

@@ -165,6 +165,25 @@ PreviousLogInfo gs_prevLog;
 // NB: all accesses to it must be protected by GetLevelsCS() critical section
 WX_DEFINE_GLOBAL_VAR(wxStringToNumHashMap, ComponentLevels);
 
+// ----------------------------------------------------------------------------
+// wxLogOutputBest: wxLog wrapper around wxMessageOutputBest
+// ----------------------------------------------------------------------------
+
+class wxLogOutputBest : public wxLog
+{
+public:
+    wxLogOutputBest() { }
+
+protected:
+    virtual void DoLogText(const wxString& msg)
+    {
+        wxMessageOutputBest().Output(msg);
+    }
+
+private:
+    wxDECLARE_NO_COPY_CLASS(wxLogOutputBest);
+};
+
 } // anonymous namespace
 
 // ============================================================================
@@ -481,7 +500,7 @@ wxLog *wxLog::GetMainThreadActiveTarget()
             if ( wxTheApp != NULL )
                 ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();
             else
-                ms_pLogger = new wxLogStderr;
+                ms_pLogger = new wxLogOutputBest;
 
             s_bInGetActiveTarget = false;