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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/110708] std::format("{:%EEC %OOd}",
 std::chrono::system_clock::now()) should be rejected
Date: Wed, 19 Jul 2023 10:11:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110708

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:52bfec7ea0eb0f1a4c5bfa55b0d6b9b6c8808e26

commit r14-2638-g52bfec7ea0eb0f1a4c5bfa55b0d6b9b6c8808e26
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jul 18 10:36:37 2023 +0100

    libstdc++: Check for multiple modifiers in chrono format string [PR1107=
08]

    The logic for handling modified chrono specs like %Ey was just
    restarting the loop after each modifier, and not checking whether we'd
    already seen a modifier.

    libstdc++-v3/ChangeLog:

            PR libstdc++/110708
            * include/bits/chrono_io.h (__formatter_chrono::_M_parse): Only
            allow a single modifier.
            * testsuite/std/time/format.cc: Check multiple modifiers.=