From: Joseph Myers <joseph@codesourcery.com>
To: Qing Zhao <qing.zhao@oracle.com>
Cc: jakub Jelinek <jakub@redhat.com>,
richard Biener <rguenther@suse.de>,
Kees Cook <keescook@chromium.org>,
gcc Patches <gcc-patches@gcc.gnu.org>,
Nathan Sidwell <Nathan@acm.org>, martin Sebor <msebor@gmail.com>
Subject: Re: [[GCC13][Patch][V3] 1/2] Add a new option -fstrict-flex-array[=n] and new attribute strict_flex_array
Date: Wed, 31 Aug 2022 17:21:35 +0000 [thread overview]
Message-ID: <alpine.DEB.2.22.394.2208311719200.498823@digraph.polyomino.org.uk> (raw)
In-Reply-To: <FE1A2F0B-5306-46A3-A543-6F7632138B15@oracle.com>
[-- Attachment #1: Type: text/plain, Size: 1007 bytes --]
On Wed, 31 Aug 2022, Qing Zhao via Gcc-patches wrote:
> > "a GNU extension" suggests a particular language feature, but I think
> > you're actually referring here to a whole language version rather than an
> > individual feature.
>
> Is “not supported by GNU extension GNU89” better?
There are no existing diagnostics referring to GNU89 at all. I don't
think "GNU extension" needs to be mentioned in that diagnostic, but I also
think that having that diagnostic at all is ill-conceived.
> > In any case, -std=gnu89 supports flexible array members.
>
> Yes, but only [0],[1] are supported as flexible array members. The C99
> flexible array member [] is not supported by GNU89, right?
C99 flexible array members are fully supported in GNU89 mode. In general,
any feature from a new language version that doesn't affect code that was
valid in previous versions is likely to be accepted as an extension with
options for older language versions.
--
Joseph S. Myers
joseph@codesourcery.com
WARNING: multiple messages have this Message-ID
From: Joseph Myers <joseph@codesourcery.com>
To: Qing Zhao <qing.zhao@oracle.com>
Cc: jakub Jelinek <jakub@redhat.com>,
richard Biener <rguenther@suse.de>,
Kees Cook <keescook@chromium.org>,
gcc Patches <gcc-patches@gcc.gnu.org>,
Nathan Sidwell <Nathan@acm.org>, martin Sebor <msebor@gmail.com>
Subject: Re: [[GCC13][Patch][V3] 1/2] Add a new option -fstrict-flex-array[=n] and new attribute strict_flex_array
Date: Wed, 31 Aug 2022 17:21:35 +0000 [thread overview]
Message-ID: <alpine.DEB.2.22.394.2208311719200.498823@digraph.polyomino.org.uk> (raw)
Message-ID: <20220831172135.CJk8mwnWbXcdBiNaoTuOfU1F6zQoDacpZKixhZHK-QY@z> (raw)
In-Reply-To: <FE1A2F0B-5306-46A3-A543-6F7632138B15@oracle.com>
On Wed, 31 Aug 2022, Qing Zhao via Gcc-patches wrote:
> > "a GNU extension" suggests a particular language feature, but I think
> > you're actually referring here to a whole language version rather than an
> > individual feature.
>
> Is “not supported by GNU extension GNU89” better?
There are no existing diagnostics referring to GNU89 at all. I don't
think "GNU extension" needs to be mentioned in that diagnostic, but I also
think that having that diagnostic at all is ill-conceived.
> > In any case, -std=gnu89 supports flexible array members.
>
> Yes, but only [0],[1] are supported as flexible array members. The C99
> flexible array member [] is not supported by GNU89, right?
C99 flexible array members are fully supported in GNU89 mode. In general,
any feature from a new language version that doesn't affect code that was
valid in previous versions is likely to be accepted as an extension with
options for older language versions.
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2022-08-31 17:21 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-17 14:40 Qing Zhao
2022-08-17 14:40 ` [[GCC13][Patch][V3] 2/2] Use array_at_struct_end_p in __builtin_object_size [PR101836] Qing Zhao
2022-08-26 8:49 ` Richard Biener
2022-08-26 13:37 ` Qing Zhao
2022-08-26 8:48 ` [[GCC13][Patch][V3] 1/2] Add a new option -fstrict-flex-array[=n] and new attribute strict_flex_array Richard Biener
2022-08-26 13:47 ` Qing Zhao
2022-08-29 8:04 ` Richard Biener
2022-08-30 20:30 ` Fwd: " Qing Zhao
2022-08-30 20:30 ` Qing Zhao
2022-08-30 22:53 ` Joseph Myers
2022-08-31 14:00 ` Qing Zhao
2022-08-31 17:21 ` Joseph Myers [this message]
2022-08-31 17:21 ` Joseph Myers
2022-08-31 18:55 ` Qing Zhao
2022-08-31 19:24 ` Qing Zhao
2022-08-31 19:29 ` Joseph Myers
2022-08-31 19:29 ` Joseph Myers
2022-08-31 19:47 ` Qing Zhao
2022-08-31 19:52 ` Joseph Myers
2022-08-31 20:06 ` Qing Zhao
2022-08-31 20:09 ` Joseph Myers
2022-08-31 20:16 ` Qing Zhao
2022-08-31 20:35 ` Qing Zhao
2022-08-31 22:23 ` Kees Cook
2022-09-01 6:11 ` Richard Biener
2022-09-04 14:17 ` Qing Zhao
2022-08-31 22:17 ` Kees Cook
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