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From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	git@vger.kernel.org, "Denton Liu" <liu.denton@gmail.com>,
	"Jeff Hostetler" <jeffhost@microsoft.com>
Subject: Re: [PATCH] trace2: refactor to avoid gcc warning under -O3
Date: Wed, 5 May 2021 09:34:50 -0400	[thread overview]
Message-ID: <YJKe+ncDqrqq1i8P@coredump.intra.peff.net> (raw)
In-Reply-To: <xmqqwnsd3426.fsf@gitster.g>

On Wed, May 05, 2021 at 06:47:29PM +0900, Junio C Hamano wrote:

> The patch makes sense to me, modulo that the way the variable
> "saved_errno" introduced by this patch is used and the way a
> variable with that name is typically used in our codebase are at
> odds.  I.e. we typically call a variable "saved_errno" when it is
> used in this pattern:
> 
>     if (a_syscall_whose_error_condition_we_care_about()) {
> 	int saved_errno = errno;
> 	perform_some_cleanup_operation_that_might_clobber_errno();
> 	return error_errno(..., saved_errno);
> 	/*
> 	 * or
> 	 * errno = saved_errno;
> 	 * return -1;
> 	 * and let the caller handle 'errno'
> 	 */
>     }
> 
> But since I do not think of a better name for this new variable that
> is not exactly used like so, let's queue it as-is.

I'd probably have just called it "err", but I think it is fine either
way. :)

The patch also looks good to me. I used to compile with -O3 occasionally
to fix warnings, but given the date on this commit, it seems I have not
done so in quite a while. (It reproduces on gcc 10 for me, which is not
surprising).

-Peff

  reply	other threads:[~2021-05-05 13:34 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-01  7:30 [PATCH] Fix -Wmaybe-uninitialized warnings under -O0 Denton Liu
     [not found] ` <CAPUEspgBkmxszgBee8C9hZnEwqztf-XKEj7LB_jWVFJaJCge0w@mail.gmail.com>
2020-04-01  9:05   ` Denton Liu
2020-04-01  9:52 ` Jeff King
2020-04-01 14:06   ` Denton Liu
2020-04-03 14:04     ` Jeff King
2020-04-03 14:38       ` Jeff King
2020-04-04 12:07       ` Denton Liu
2020-04-04 14:21         ` Jeff King
2021-05-05  8:40           ` [PATCH] trace2: refactor to avoid gcc warning under -O3 Ævar Arnfjörð Bjarmason
2021-05-05  9:47             ` Junio C Hamano
2021-05-05 13:34               ` Jeff King [this message]
2021-05-05 14:38             ` Johannes Schindelin
2021-05-06  1:26               ` Junio C Hamano
2021-05-06 20:29                 ` Johannes Schindelin
2021-05-06 21:10                   ` Junio C Hamano
2021-05-11 14:34                     ` Johannes Schindelin
2021-05-11 18:00                       ` Jeff King
2021-05-11 20:58                         ` Junio C Hamano
2021-05-11 21:07                           ` Jeff King
2021-05-11 21:33                             ` Junio C Hamano
2021-05-11  7:03             ` Junio C Hamano
2021-05-11 13:04             ` [PATCH v2] " Ævar Arnfjörð Bjarmason
2021-05-11 16:40               ` Jeff Hostetler
2021-05-11 17:54               ` Jeff King
2021-05-11 18:08                 ` Jeff King
2021-05-11 21:09                   ` Junio C Hamano
2021-05-20  0:20                   ` Junio C Hamano
2021-05-20 11:05                     ` [PATCH v3] " Ævar Arnfjörð Bjarmason
2021-05-20 13:13                       ` Jeff King
2021-05-20 22:08                         ` Junio C Hamano
2021-05-21  9:34                           ` Jeff King

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