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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/53277] -Wconversion cannot handle compound expressions
Date: Tue, 20 Jul 2021 17:41:20 +0000	[thread overview]
Message-ID: <bug-53277-4-BRPdWMgpb4@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-53277-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For C++ the comment 15 case seems to have been fixed by r10-6527:

    c++: Use constexpr to avoid wrong -Wsign-compare (PR90691).

    We would like to do constexpr evaluation to avoid false positives on
    warnings, but constexpr evaluation can involve function body copying that
    changes DECL_UID, which breaks -fcompare-debug.  So let's remember
    that we need to avoid that.

            PR c++/90691
            * expr.c (fold_for_warn): Call maybe_constant_value.
            * constexpr.c (struct constexpr_ctx): Add uid_sensitive field.
            (maybe_constant_value): Add uid_sensitive parm.
            (get_fundef_copy): Don't copy if it's true.
            (cxx_eval_call_expression): Don't instantiate if it's true.
            (cxx_eval_outermost_constant_expr): Likewise.

But it still warns when compiled as C.

  parent reply	other threads:[~2021-07-20 17:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-08  9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
2012-05-08 16:06 ` [Bug c/53277] " pinskia at gcc dot gnu.org
2012-05-09 10:51 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:53 ` jgpallero at gmail dot com
2012-05-09 10:54 ` jgpallero at gmail dot com
2012-05-09 10:56 ` jgpallero at gmail dot com
2012-05-09 11:06 ` jgpallero at gmail dot com
2012-05-09 12:07 ` glisse at gcc dot gnu.org
2012-05-09 12:54 ` manu at gcc dot gnu.org
2012-05-09 13:11 ` jgpallero at gmail dot com
2012-05-09 13:12 ` glisse at gcc dot gnu.org
2012-05-09 13:46 ` manu at gcc dot gnu.org
2012-05-09 15:17 ` jgpallero at gmail dot com
2012-05-09 15:56 ` [Bug c/53277] -Wconversion cannot handle compound expresions manu at gcc dot gnu.org
2021-07-20 17:16 ` [Bug c/53277] -Wconversion cannot handle compound expressions me at xenu dot pl
2021-07-20 17:33 ` me at xenu dot pl
2021-07-20 17:41 ` redi at gcc dot gnu.org [this message]
2021-07-20 17:42 ` pinskia at gcc dot gnu.org
2023-06-15  0:34 ` pinskia at gcc dot gnu.org

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