Hello,

thanks for the report and patch.

> -Werror=mismatched-new-delete
> In src/gengetopt 'n' is being allocated with operator new() but freed with free().

Applied, thanks.

> -Werror=deprecated-declarations
> In gm_utils.h print_f and pair_print_f are defined as
> std::unary_functions. These have been deprecated/removed in C++ 11/17.

This patch does break compatibility with C++98 and C++03.  So it needs to be solved in different way.  However it seems that just deleting the `: public std::unary_function ...' does allow compilation both under 98 and 23.  Any opinions on this fix:

@@ -117,7 +117,7 @@ bool string_contains(const char *s, const char *tofind);
  * Function object to print something into a stream (to be used with for_each)
  */
 template<class T>
-struct print_f : public std::unary_function<T, void>
+struct print_f
 {
     print_f(std::ostream& out, const string &s = ", ") : os(out), sep(s) {}
     void operator() (T x) { os << x << sep; }
@@ -129,7 +129,7 @@ struct print_f : public std::unary_function<T, void>
  * Function object to print a pair into two streams (to be used with for_each)
  */
 template<class T>
-struct pair_print_f : public std::unary_function<T, void>
+struct pair_print_f
 {
     pair_print_f(std::ostream& out1, std::ostream& out2, const string &s = ", ") :
         os1(out1), os2(out2), sep(s) {}

?  I do not write C++ daily anymore, so I am unsure of the exact implications
here.  But if it does compile ...  Alternative would be ifdef with pre- and
post- C++11 branches.

> -Werror=unused-result
> I'm unsure if i'm missing something here? It seems like gm_utils is supposed
> not to do anything on this line so it should be fair to remove.

I am pretty sure you are right.

> + an error about comparing the result of pointer and integer arithmetics with
> NULL (scanner.ll)

Thanks, fixed.