include wx/datetime.h and test for wxUSE_DATETIME before using wxLocaltime_r()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/logg.cpp

@@ -81,6 +81,7 @@
 // allows to exclude the usage of wxDateTime
 static wxString TimeStamp(const wxChar *format, time_t t)
 {
+#if wxUSE_DATETIME
     wxChar buf[4096];
     struct tm tm;
     if ( !wxStrftime(buf, WXSIZEOF(buf), format, wxLocaltime_r(&t, &tm)) )
@@ -89,6 +90,9 @@ static wxString TimeStamp(const wxChar *format, time_t t)
         wxFAIL_MSG(_T("strftime() failed"));
     }
     return wxString(buf);
+#else // !wxUSE_DATETIME
+    return wxEmptyString;
+#endif // wxUSE_DATETIME/!wxUSE_DATETIME
 }