C++: underline parameters in mismatching function calls
gcc/cp/ChangeLog:
* call.c (get_fndecl_argument_location): New function.
(convert_like_real): Use it when complaining about argument type
mismatches.
* cp-tree.h (struct cp_parameter_declarator): Add "loc" field.
* parser.c (make_parameter_declarator): Add "loc" param and use
it to initialize the new field.
(cp_parser_translation_unit): Add UNKNOWN_LOCATION for "loc" of
the "no_parameters" parameter.
(cp_parser_parameter_declaration_list): Set the location of the
result of grokdeclarator to be the parameter's loc, assuming no
errors.
(cp_parser_parameter_declaration): Generate a location for the
parameter and pass to make_parameter_declarator.
gcc/testsuite/ChangeLog:
* g++.dg/diagnostic/param-type-mismatch.C: Update expected results
to reflect highlighting of parameters; add test coverage for
callback parameters.