From: Jeff King <peff@peff.net>
To: Thomas Gummerer <t.gummerer@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH] config.mak.dev: add -Wformat
Date: Fri, 12 Oct 2018 14:45:49 -0400 [thread overview]
Message-ID: <20181012184549.GC4917@sigill.intra.peff.net> (raw)
In-Reply-To: <20181012184037.15076-1-t.gummerer@gmail.com>
On Fri, Oct 12, 2018 at 07:40:37PM +0100, Thomas Gummerer wrote:
> 801fa63a90 ("config.mak.dev: add -Wformat-security", 2018-09-08) added
> the -Wformat-security to the flags set in config.mak.dev. In the gcc
> man page this is documented as:
>
> If -Wformat is specified, also warn about uses of format
> functions that represent possible security problems. [...]
>
> That commit did however not add the -Wformat flag, and -Wformat is not
> specified anywhere else by default, so the added -Wformat-security had
> no effect. Newer versions of gcc (gcc 8.2.1 in this particular case)
> warn about this and thus compilation fails with this option set.
>
> Fix that, and make -Wformat-security actually useful by adding the
> -Wformat flag as well. git compiles cleanly with both these flags
> applied.
-Wformat is part of -Wall, which we already turn on by default (even for
non-developer builds).
So I don't think we need to do anything more, though I'm puzzled that
you saw a failure. Do you set CFLAGS explicitly in your config.mak to
something that doesn't include -Wall?
I'm not opposed to making config.mak.dev a bit more redundant to handle
this case, but we'd probably want to include all of -Wall, since it
contains many other warnings we'd want to make sure are enabled.
-Peff
next prev parent reply other threads:[~2018-10-12 18:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-12 18:40 [PATCH] config.mak.dev: add -Wformat Thomas Gummerer
2018-10-12 18:45 ` Jeff King [this message]
2018-10-12 18:54 ` Jonathan Nieder
2018-10-12 19:11 ` Jeff King
2018-10-12 19:15 ` Thomas Gummerer
2018-12-27 18:59 ` Jonathan Nieder
2019-01-03 16:55 ` Junio C Hamano
2019-01-03 18:54 ` Jonathan Nieder
2019-01-06 18:17 ` Thomas Gummerer
2019-01-07 17:04 ` Junio C Hamano
2019-01-07 21:16 ` Jonathan Nieder
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