* charset.c (cpp_init_iconv): Initialize utf8_cset_desc.
(_cpp_destroy_iconv): Destroy utf8_cset_desc, char16_cset_desc and char32_cset_desc. (converter_for_type): Handle CPP_UTF8STRING. (cpp_interpret_string): Handle CPP_UTF8STRING and raw-strings. * directives.c (get__Pragma_string): Handle CPP_UTF8STRING. (parse_include): Reject raw strings. * include/cpplib.h (CPP_UTF8STRING): New token type. * internal.h (struct cpp_reader): Add utf8_cset_desc field. * lex.c (lex_raw_string): New function. (lex_string): Handle u8 string literals, call lex_raw_string for raw string literals. (_cpp_lex_direct): Call lex_string even for u8" and {,u,U,L,u8}R" sequences. * macro.c (stringify_arg): Handle CPP_UTF8STRING. * c-common.c (c_parse_error): Handle CPP_UTF8STRING. * c-lex.c (c_lex_with_flags): Likewise. Test C_LEX_STRING_NO_JOIN instead of C_LEX_RAW_STRINGS. (lex_string): Handle CPP_UTF8STRING. * c-parser.c (c_parser_postfix_expression): Likewise. * c-pragma.h (C_LEX_RAW_STRINGS): Rename to ....
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