[Bug c/123583] [13/14/15/16 Regression] Named address space qualifier causes undeclared identifier error

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123583

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Senthil Kumar Selvaraj
<saaadhu@gcc.gnu.org>:

https://gcc.gnu.org/g:3090d28ab359e8299aee33386dc44b81faf8edca

commit r16-7117-g3090d28ab359e8299aee33386dc44b81faf8edca
Author: Senthil Kumar Selvaraj <saaadhu@gcc.gnu.org>
Date:   Wed Jan 28 13:59:55 2026 +0530

    c: Fix parser error on address space names [PR 123583]

    This patch fixes a regression introduced by PR 67784
    (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67784) - it broke
    recognition of named address space qualifiers (such as __memx on
    AVR or __seg_gs on x86) after certain statements.

    The fix for PR 67784 attempts to reclassify tokens whose
    token->id_kind could have been set incorrectly (because of possibly
    wrong scope when peeking ahead). c_parser_maybe_reclassify_token
    only skips reclassification for C_ID_CLASSNAME though - a token with
    id_kind = C_ID_ADDRSPACE ends up getting reclassified as C_ID_ID,
    eventually causing a ": error: '<address space name>' undeclared"
    error later down the line.

    Rather than explicitly excluding C_ID_ADDRSPACE, the patch modifies
    the check to reclassify only tokens kinds that could potentially get
    incorrectly classified - C_ID_ID and C_ID_TYPENAME.

    Bootstrapped and regtested on x86_64-linux.

            PR c/123583

    gcc/c/ChangeLog:

            * c-parser.cc (c_parser_maybe_reclassify_token): Reclassify only
            C_ID_ID and C_ID_TYPENAME tokens.

    gcc/testsuite/ChangeLog:

            * gcc.target/avr/pr123583.c: New test.
            * gcc.target/i386/pr123583.c: New test.