--- a/main.hh	Sun Nov 16 12:54:10 2014 +0000
+++ b/main.hh	Sun Nov 16 14:46:52 2014 +0000
@@ -36,6 +36,29 @@
 
 
 
+/* Compiler options, specified at runtime on the command line */
+
+typedef struct {
+   /* options specific to stage1_2 */
+	bool safe_extensions;          /* support SAFE_* datatypes defined in PLCOpen TC5 "Safety Software Technical Specification - Part 1" v1.0 */
+	bool full_token_loc;           /* error messages specify full token location */
+	bool conversion_functions;     /* Create a conversion function for derived datatype */
+	bool nested_comments;          /* Allow the use of nested comments. */
+	bool ref_standard_extensions;  /* Allow the use of REFerences (keywords REF_TO, REF, DREF, ^, NULL). */
+	bool ref_nonstand_extensions;  /* Allow the use of non-standard extensions to REF_TO datatypes: REF_TO ANY, and REF_TO in struct elements! */
+	const char *includedir;        /* Include directory, where included files will be searched for... */
+	
+   /* options specific to stage3 */
+	bool relaxed_datatype_model;   /* Use the relaxed datatype equivalence model, instead of the default strict equivalence model */
+} runtime_options_t;
+
+extern runtime_options_t runtime_options;
+
+
+
+
+
+
  /* Function used throughout the code --> used to report failed assertions (i.e. internal compiler errors)! */
 #include <stddef.h>  /* required for NULL */