Is there an option to change the message produced by YYERROR_VERBOSE?

[Simon Sobisch]

We use bison in cobc (the GnuCOBOL compiler) and would like to check the
content of the unexpected part in

      YYCASE_(0, YY_("syntax error"));
      YYCASE_(1, YY_("syntax error, unexpected %s"));
      YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
      YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
      YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or
%s"));
      YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or
%s or %s"));

as the reserved words differ depending on -std.

If the unexpected %s is not in the reserved words list currently active
because of the compiler configuration but is in the global one we add
another line to the warning, something like "%s not supported with std %s".

How can this be achieved?

Thank you for your support,
Simon

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