[Bug preprocessor/84517] [8 Regression] "string literal"__FILE__ no longer accepted

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84517

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Feb 28 15:27:17 2018
New Revision: 258069

URL: https://gcc.gnu.org/viewcvs?rev=258069&root=gcc&view=rev
Log:
PR preprocessor/84517 allow double-underscore macros after string literals

gcc/testsuite:

        PR preprocessor/84517
        * g++.dg/cpp0x/udlit-macros.C: Expect a warning for ""__FILE__.

libcpp:

        PR preprocessor/84517
        * lex.c (is_macro_not_literal_suffix): New function.
        (lex_raw_string, lex_string): Use is_macro_not_literal_suffix to
        decide when to issue -Wliteral-suffix warnings.

Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/cpp0x/udlit-macros.C
    trunk/libcpp/ChangeLog
    trunk/libcpp/lex.c