[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 #15 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:a6502accf381358173b19e615fdeb0aa17949c93

commit r15-2122-ga6502accf381358173b19e615fdeb0aa17949c93
Author: Andi Kleen <ak@linux.intel.com>
Date:   Tue Jan 23 23:42:08 2024 -0800

    Improve must tail in RTL backend

    - Give error messages for all causes of non sibling call generation
    - When giving error messages clear the musttail flag to avoid ICEs
    - Error out when tree-tailcall failed to mark a must-tail call
    sibcall. In this case it doesn't know the true reason and only gives
    a vague message.

    gcc/ChangeLog:

            PR c/83324
            * calls.cc (maybe_complain_about_tail_call): Clear must tail
            flag on error.
            (expand_call): Give error messages for all musttail failures.