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gcc/c-family/ChangeLog: PR c/70339 * c-common.h (enum lookup_name_fuzzy_kind): New enum. (lookup_name_fuzzy): New prototype. gcc/c/ChangeLog: PR c/70339 * c-decl.c: Include spellcheck-tree.h and gcc-rich-location.h. (implicit_decl_warning): When issuing warnings for implicit declarations, attempt to provide a suggestion via lookup_name_fuzzy. (undeclared_variable): Likewise when issuing errors. (lookup_name_in_scope): Likewise. (struct edit_distance_traits<cpp_hashnode *>): New struct. (best_macro_match): New typedef. (find_closest_macro_cpp_cb): New function. (lookup_name_fuzzy): New function. * c-parser.c: Include gcc-rich-location.h. (c_token_starts_typename): Split out case CPP_KEYWORD into... (c_keyword_starts_typename): ...this new function. (c_parser_declaration_or_fndef): When issuing errors about missing "struct" etc, add a fixit. For other kinds of errors, attempt to provide a suggestion via lookup_name_fuzzy. (c_parser_parms_declarator): When looking ahead to detect typos in type names, also reject CPP_KEYWORD. (c_parser_parameter_declaration): When issuing errors about unknown type names, attempt to provide a suggestion via lookup_name_fuzzy. * c-tree.h (c_keyword_starts_typename): New prototype. gcc/ChangeLog: PR c/70339 * diagnostic-core.h (pedwarn_at_rich_loc): New prototype. * diagnostic.c (pedwarn_at_rich_loc): New function. * spellcheck.h (best_match::best_match): Add a "best_distance_so_far" optional parameter. (best_match::set_best_so_far): New method. (best_match::get_best_distance): New accessor. (best_match::get_best_candidate_length): New accessor. gcc/testsuite/ChangeLog: PR c/70339 * c-c++-common/attributes-1.c: Update dg-prune-output to include hint. * gcc.dg/diagnostic-token-ranges.c (undeclared_identifier): Update expected results due to builtin "nanl" now being suggested for "name". * gcc.dg/pr67580.c: Update expected messages. * gcc.dg/spellcheck-identifiers.c: New testcase. * gcc.dg/spellcheck-typenames.c: New testcase. From-SVN: r237714
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