From: Florian Weimer <fweimer@redhat.com>
To: "Carlos O'Donell" <carlos@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] Fix -Os related -Werror failures.
Date: Fri, 28 Oct 2016 06:32:00 -0000 [thread overview]
Message-ID: <6be7dce5-bfa7-32c7-5bac-6c3b79776683@redhat.com> (raw)
In-Reply-To: <6eac682f-26fa-6a47-9497-357206266ba1@redhat.com>
On 10/28/2016 06:46 AM, Carlos O'Donell wrote:
> +/* With GCC 5.3 when compiling with -Os the compiler emits a warning
> + that buf[0] and buf[1] may be used uninitialized. This can only
> + happen in the case where tmpbuf[3] is used, and in that case the
> + write to the tmpbuf[1] and tmpbuf[2] was assured because
> + ucs4_to_cns11643 would have filled in those entries. The difficulty
> + is in getting the compiler to see this logic because tmpbuf[0] is
> + involved in determining the code page and is the indicator that
> + tmpbuf[2] is initialized. */
> +DIAG_PUSH_NEEDS_COMMENT;
> +DIAG_IGNORE_NEEDS_COMMENT (5.3, "-Wmaybe-uninitialized");
This hides the warning for -O2 builds as well, so I don't think this is
a good idea.
Those who want to build with -Os or other special compiler flags should
just configure with --disable-werror. We can't account for every
optimization someone might want to disable in their build.
Florian
next prev parent reply other threads:[~2016-10-28 6:32 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-28 4:48 Carlos O'Donell
2016-10-28 6:25 ` Andreas Schwab
2016-10-28 6:32 ` Florian Weimer [this message]
2016-10-28 6:44 ` Jeff Law
2016-10-28 8:12 ` Arnd Bergmann
2016-10-28 8:17 ` Andrew Pinski
2016-10-28 13:28 ` Jeff Law
2016-10-28 20:10 ` Paul Eggert
2016-10-29 3:03 ` Jeff Law
2016-10-30 4:25 ` Paul Eggert
2016-10-28 12:09 ` Carlos O'Donell
2016-10-28 12:43 ` Florian Weimer
2016-10-28 13:04 ` Joseph Myers
2016-10-28 13:07 ` Carlos O'Donell
2016-10-28 12:49 ` Joseph Myers
2016-10-28 12:55 ` Florian Weimer
2016-10-28 13:18 ` Carlos O'Donell
2016-10-28 13:58 ` [PATCH v2] Fix -Os related build and test failures Carlos O'Donell
2016-10-28 14:17 ` Joseph Myers
2016-10-29 2:59 ` [PATCH v3] " Carlos O'Donell
2016-10-29 3:26 ` Carlos O'Donell
2016-10-29 17:35 ` Joseph Myers
2016-10-30 3:51 ` [PATCH v4] " Carlos O'Donell
2016-10-31 8:33 ` Andreas Schwab
2016-10-31 9:16 ` Carlos O'Donell
2016-10-31 9:22 ` Florian Weimer
2016-10-31 12:56 ` David Miller
2016-10-31 19:56 ` Carlos O'Donell
2016-11-01 22:59 ` Joseph Myers
2016-11-02 12:52 ` Carlos O'Donell
2016-11-01 9:17 ` Andreas Schwab
2016-11-01 11:13 ` Joseph Myers
2016-11-01 15:58 ` Tamar Christina
2016-11-01 16:06 ` David Miller
2016-11-01 16:15 ` Tamar Christina
2016-11-02 11:53 ` Carlos O'Donell
2016-11-02 17:03 ` Carlos O'Donell
2016-11-02 13:22 ` Carlos O'Donell
2016-10-31 18:38 ` [PATCH v3] " Steve Ellcey
2016-10-31 19:50 ` Carlos O'Donell
2016-10-31 19:57 ` Steve Ellcey
2016-10-31 20:50 ` Carlos O'Donell
2016-10-31 21:00 ` Steve Ellcey
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