From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Stefan Beller <sbeller@google.com>
Subject: Re: [PATCH 0/2] fail compilation with strcpy
Date: Fri, 20 Jul 2018 11:58:10 -0700 [thread overview]
Message-ID: <xmqqo9f1bupp.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20180719203259.GA7869@sigill.intra.peff.net> (Jeff King's message of "Thu, 19 Jul 2018 16:33:00 -0400")
Jeff King <peff@peff.net> writes:
> This is a patch series to address the discussion in the thread at:
>
> https://public-inbox.org/git/20180713204350.GA16999@sigill.intra.peff.net/
>
> Basically, the question was: can we declare strcpy banned and have a
> linter save us the trouble of finding it in review. The answer is yes,
> the compiler is good at that. ;)
>
> There are probably as many lists of banned functions as there are coding
> style documents. I don't agree with every entry in the ones I've seen.
> And in many cases coccinelle is a better choice, because the problem is
> not "this function is so bad your patch should not even make it to the
> list with it", but "don't do it like A; we prefer to do it like B
> instead". And coccinelle does the latter more flexibly and
> automatically.
>
> So I tried to pick some obvious and uncontroversial candidates here.
> gets() could be another one, but it's mostly banned already (it's out of
> the standard, and most libcs mark it with a deprecated attribute).
>
> Note that this needs to be applied on top of 022d2ac1f3 (blame: prefer
> xsnprintf to strcpy for colors, 2018-07-13) or it will complain loudly. :)
>
> [1/2]: introduce "banned function" list
> [2/2]: banned.h: mark strncpy as banned
Hmph, there is no use of any banned function in hex.c, but when
this topic is merged to 'pu', I seem to get this:
$ make DEVELOPER=1 hex.o
GIT_VERSION = 2.18.0.758.g18f90b35b8
CC hex.o
In file included from git-compat-util.h:1250:0,
from cache.h:4,
from hex.c:1:
banned.h:14:0: error: "strncpy" redefined [-Werror]
#define strncpy(x,y,n) BANNED(strncpy)
In file included from /usr/include/string.h:630:0,
from git-compat-util.h:165,
from cache.h:4,
from hex.c:1:
/usr/include/x86_64-linux-gnu/bits/string2.h:84:0: note: this is the location of the previous definition
# define strncpy(dest, src, n) __builtin_strncpy (dest, src, n)
cc1: all warnings being treated as errors
Makefile:2279: recipe for target 'hex.o' failed
make: *** [hex.o] Error 1
next prev parent reply other threads:[~2018-07-20 18:58 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-19 20:33 [PATCH 0/2] fail compilation with strcpy Jeff King
2018-07-19 20:39 ` [PATCH 1/2] introduce "banned function" list Jeff King
2018-07-19 21:11 ` Eric Sunshine
2018-07-19 21:27 ` Jeff King
2018-07-19 21:59 ` Eric Sunshine
2018-07-20 0:55 ` Jeff King
2018-07-19 21:15 ` Stefan Beller
2018-07-19 21:32 ` Jeff King
2018-07-19 21:47 ` Stefan Beller
2018-07-20 0:54 ` Jeff King
2018-07-19 22:46 ` Junio C Hamano
2018-07-19 23:55 ` Randall S. Becker
2018-07-20 1:08 ` Jeff King
2018-07-20 1:12 ` Jeff King
2018-07-20 9:32 ` Junio C Hamano
2018-07-20 17:45 ` Jeff King
2018-07-20 13:22 ` Theodore Y. Ts'o
2018-07-20 17:56 ` Jeff King
2018-07-20 19:03 ` Junio C Hamano
2018-07-20 12:42 ` Derrick Stolee
2018-07-20 14:41 ` Duy Nguyen
2018-07-20 17:48 ` Elijah Newren
2018-07-20 18:04 ` Jeff King
2018-07-20 18:00 ` Jeff King
2018-07-19 20:39 ` [PATCH 2/2] banned.h: mark strncpy as banned Jeff King
2018-07-19 21:12 ` Ævar Arnfjörð Bjarmason
2018-07-19 21:33 ` Jeff King
2018-07-20 18:58 ` Junio C Hamano [this message]
2018-07-20 19:18 ` [PATCH 0/2] fail compilation with strcpy Jeff King
2018-07-20 21:50 ` Junio C Hamano
2018-07-24 9:23 ` [PATCH v2 0/4] " Jeff King
2018-07-24 9:26 ` [PATCH v2 1/4] automatically ban strcpy() Jeff King
2018-07-24 17:20 ` Eric Sunshine
2018-07-26 6:58 ` Jeff King
2018-07-26 7:21 ` [PATCH v3 " Jeff King
2018-07-26 17:33 ` Junio C Hamano
2018-07-27 8:08 ` Jeff King
2018-07-27 17:34 ` Junio C Hamano
2018-07-28 9:24 ` Jeff King
2018-07-24 9:26 ` [PATCH v2 2/4] banned.h: mark strcat() as banned Jeff King
2018-07-24 9:27 ` [PATCH v2 3/4] banned.h: mark sprintf() " Jeff King
2018-07-24 9:28 ` [PATCH v2 4/4] banned.h: mark strncpy() " Jeff King
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