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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/114935] [14/15 regression] Miscompilation of
 initializer_list<std::string> in presence of exceptions since
 r14-1705-g2764335bd336f2
Date: Fri, 03 May 2024 20:01:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114935

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

https://gcc.gnu.org/g:8f3afb83c879f1bfa722a963a07c06aaf174ef72

commit r15-138-g8f3afb83c879f1bfa722a963a07c06aaf174ef72
Author: Jason Merrill <jason@redhat.com>
Date:   Fri May 3 09:52:46 2024 -0400

    c++: initializer_list<string> and EH [PR114935]

    When we initialize an array of a type with a non-trivial destructor, su=
ch
as
    the backing array for the initializer_list, we have a cleanup to destroy
any
    constructed elements if a later constructor throws.  When the array bei=
ng
    created is a variable, the end of that EH region naturally coincides wi=
th
    the beginning of the EH region for the cleanup for the variable as a wh=
ole.

    But if the array is a temporary, or a subobject of one, the array clean=
up
    region lasts for the rest of the full-expression, along with the normal
    cleanup for the TARGET_EXPR.  As a result, when tata throws we clean it=
 up
    twice.  Before r14-1705 we avoided this by disabling the array cleanup =
in
    split_nonconstant_init, but after that we don't go through
    split_nonconstant_init, so let's handle it in cp_genericize_target_expr.

            PR c++/114935

    gcc/cp/ChangeLog:

            * cp-gimplify.cc (cp_genericize_init): Add flags parm.
            (cp_genericize_init_expr): Pass nullptr.
            (cp_genericize_target_expr): Handle cleanup flags.
            * typeck2.cc (build_disable_temp_cleanup): Factor out of...
            (split_nonconstant_init): ...here.
            * cp-tree.h (build_disable_temp_cleanup): Declare.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/initlist-eh1.C: New test.=