[Bug c/83324] [feature request] Pragma or special syntax for guaranteed tail calls

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83324

--- Comment #22 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andi Kleen <ak@gcc.gnu.org>:

https://gcc.gnu.org/g:7db47f7b915c5f5d645fa536547e26b92290afe3

commit r15-2170-g7db47f7b915c5f5d645fa536547e26b92290afe3
Author: Andi Kleen <ak@linux.intel.com>
Date:   Wed Jan 24 07:44:23 2024 -0800

    C: Implement musttail attribute for returns

    Implement a C23 clang compatible musttail attribute similar to the earlier
    C++ implementation in the C parser.

    gcc/c/ChangeLog:

            PR c/83324
            * c-parser.cc (struct attr_state): Define with musttail_p.
            (c_parser_statement_after_labels): Handle [[musttail]].
            (c_parser_std_attribute): Dito.
            (c_parser_handle_musttail): Dito.
            (c_parser_compound_statement_nostart): Dito.
            (c_parser_all_labels): Dito.
            (c_parser_statement): Dito.
            * c-tree.h (c_finish_return): Add musttail_p flag.
            * c-typeck.cc (c_finish_return): Handle musttail_p flag.