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From: Ramsay Jones <ramsay@ramsayjones.plus.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
	GIT Mailing-list <git@vger.kernel.org>
Subject: Re: [PATCH 0/2] -Wuninitialized
Date: Tue, 20 Mar 2018 23:02:29 +0000	[thread overview]
Message-ID: <b939f3e7-9ccf-9a26-9ccf-2b2c13853e42@ramsayjones.plus.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.1803201514490.55@ZVAVAG-6OXH6DA.rhebcr.pbec.zvpebfbsg.pbz>



On 20/03/18 14:46, Johannes Schindelin wrote:
> Hi Ramsay,
> 
> On Mon, 19 Mar 2018, Ramsay Jones wrote:
> 
>> This series removes all 'self-initialised' variables (ie. <type> var =
>> var;).  This construct has been used to silence gcc
>> '-W[maybe-]uninitialized' warnings in the past [1]. Unfortunately, this
>> construct causes warnings to be issued by MSVC [2], along with clang
>> static analysis complaining about an 'Assigned value is garbage or
>> undefined'. The number of these constructs has dropped over the years
>> (eg. see [3] and [4]), so there are currently only 6 remaining in the
>> current codebase. As demonstrated below, 5 of these no longer cause gcc
>> to issue warnings.
> 
> Thank you so much for working on this!

These patches are based on a very old branch (that goes back
at least as far as 2010, see [1]). (I have too many in my repo,
so it will be good to remove this one)!

> In Git for Windows, to work around the MSVC issues you mention, I have
> this ugly work-around (essentially, it has a FAKE_INIT() macro that either
> performs that GCC workaround or initializes the variable to NULL/0):
> 
> 	https://github.com/git-for-windows/git/commit/474155f32a

Oh, wow! (Hmm, actually that doesn't look too bad :-D )

> FWIW I just tested your patches with Visual Studio 2017 and there are no
> C4700 warnings (the equivalent of GCC's "may be uninitialized" warning)
> [*1*].
> 
> You can find the patches (your patches rebased onto Git for Windows'
> master, plus a patch adding the project files for Visual Studio) here:
> 
> https://github.com/git-for-windows/git/compare/master...dscho:msvc-uninitialized-warning-test

Thanks for testing the patches.

> So here is my ACK, in case you want it ;-)

Thanks!

ATB,
Ramsay Jones

[1] https://public-inbox.org/git/4CFA8D4D.2020500@ramsay1.demon.co.uk/

      reply	other threads:[~2018-03-20 23:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-19 17:53 [PATCH 0/2] -Wuninitialized Ramsay Jones
2018-03-20  4:32 ` Jeff King
2018-03-20 22:41   ` Ramsay Jones
2018-03-20 14:46 ` Johannes Schindelin
2018-03-20 23:02   ` Ramsay Jones [this message]

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