gengetopt: add patch to fix compilation warnings in generated code

getgetopt generates code that causes compilation warnings in current
versions of gcc. If gengetopt is used for programs that set -Werror during
compilation, these compilation warnings become real problems.

Unfortunately, the gengetopt project seems dead for several years now. Last
release dates back to 2012. There is an open bug for this problem [1], with
a proposed patch, but no response from the maintainers.

Apply the patch from the bug report to fix the problem.

[1]  http://savannah.gnu.org/bugs/?40243

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gengetopt/0001-fix-compilation-warnings-in-generated-code.patch

@@ -0,0 +1,65 @@
+Fix compilation warnings in generated code
+
+Patch taken from open bug report http://savannah.gnu.org/bugs/?40243
+(project gengetopt seems to be dead; no hope for a new release soon)
+
+Imported by Philippe Mariman.
+This description by Thomas De Schampheleire.
+
+Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
+
+Index: gengetopt-2.22.6/src/skels/c_source.cc
+===================================================================
+--- gengetopt-2.22.6.orig/src/skels/c_source.cc	2012-11-07 20:58:29.000000000 +0100
++++ gengetopt-2.22.6/src/skels/c_source.cc	2014-11-20 12:05:02.597527761 +0100
+@@ -2424,9 +2424,12 @@
+       stream << "  FIX_UNUSED (field);";
+       stream << "\n";
+       stream << indent_str;
++      stream << "  FIX_UNUSED (stop_char);";
++      stream << "\n";
++      stream << indent_str;
++      stream << "  FIX_UNUSED (val);";
+       stream << "\n";
+       stream << indent_str;
+-      stream << "  stop_char = 0;";
+       stream << "\n";
+       stream << indent_str;
+       stream << "  found = 0;";
+@@ -3981,6 +3984,12 @@
+       stream << "\n";
+       stream << indent_str;
+     }
++  else
++    {
++      stream << "  FIX_UNUSED (check_required);";
++      stream << "\n";
++      stream << indent_str;
++    }
+   stream << "\n";
+   stream << indent_str;
+   indent = 2;
+Index: gengetopt-2.22.6/src/skels/c_source.h_skel
+===================================================================
+--- gengetopt-2.22.6.orig/src/skels/c_source.h_skel	2012-11-02 18:43:24.000000000 +0100
++++ gengetopt-2.22.6/src/skels/c_source.h_skel	2014-11-20 12:05:22.501528424 +0100
+@@ -767,8 +767,9 @@
+   char **string_field;
+ @ENDIF@
+   FIX_UNUSED (field);
++  FIX_UNUSED (stop_char);
++  FIX_UNUSED (val);
+ 
+-  stop_char = 0;
+   found = 0;
+ 
+   if (!multiple_option && prev_given && (*prev_given || (check_ambiguity && *field_given)))
+@@ -1327,6 +1328,8 @@
+     {
+       error_occurred += @parser_name@_required2 (args_info, argv[0], additional_error);
+     }
++@ELSE@
++  FIX_UNUSED (check_required);
+ @ENDIF@
+ 
+   @parser_name@_release (&local_args_info);