1 files changed, 12 insertions, 0 deletions
diff --git a/src/pre.l b/src/pre.l
index 672104f..e5300bc 100644
--- a/src/pre.l
+++ b/src/pre.l
@@ -105,6 +105,7 @@ static int                g_condCtx;
 static bool               g_skip;
 static QStack<bool>       g_condStack;
 
+static bool               g_lexInit = FALSE;
 
 
 static void setFileName(const char *name)
@@ -2377,6 +2378,7 @@ void preprocessFile(const char *fileName,BufStr &output)
   g_guardExpr.resize(0);
   
   preYYlex();
+  g_lexInit=TRUE;
   if (inputFilter.isEmpty())
     fclose(preYYin);
   else
@@ -2399,6 +2401,16 @@ void preprocessFile(const char *fileName,BufStr &output)
   }
 }
 
+void preFreeScanner()
+{
+#if defined(YY_FLEX_SUBMINOR_VERSION) 
+  if (g_lexInit)
+  {
+    preYYlex_destroy();
+  }
+#endif
+}
+
 #if !defined(YY_FLEX_SUBMINOR_VERSION) 
 extern "C" { // some bogus code to keep the compiler happy
 //  int  preYYwrap() { return 1 ; }