[Bug c++/124397] internal compiler error: error reporting routines re-entered with lambda-expr

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124397

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:2572ce8f1d8f2a27f2d6007848efb27556c52905

commit r16-8015-g2572ce8f1d8f2a27f2d6007848efb27556c52905
Author: Marek Polacek <polacek@redhat.com>
Date:   Sun Mar 8 12:34:30 2026 -0400

    c++: error routines re-entered with uneval lambda [PR124397]

    As discussed in
    <https://gcc.gnu.org/pipermail/gcc-patches/2026-March/710075.html>
    we shouldn't override complain with tf_warning_or_error when we are
    emitting cp_printer diagnostics.  We had no way to check that so
    this patch adds emitting_diagnostic_p.

            PR c++/124397

    gcc/cp/ChangeLog:

            * pt.cc (tsubst_lambda_expr): Don't override complain when emitting
            diagnostics.

    gcc/ChangeLog:

            * diagnostic.h (emitting_diagnostic_p): New.
            * diagnostics/context.h (context::emitting_diagnostic_p): New.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/lambda-uneval30.C: New test.

    Reviewed-by: Jason Merrill <jason@redhat.com>
    Reviewed-by: David Malcolm <dmalcolm@redhat.com>