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From: Ramsay Jones <ramsay@ramsayjones.plus.com>
To: "Đoàn Trần Công Danh" <congdanhqx@gmail.com>, git@vger.kernel.org
Subject: Re: [PATCH v2 2/4] compat/regex: include alloca.h before undef it
Date: Fri, 24 Apr 2020 17:56:46 +0100	[thread overview]
Message-ID: <820d44c5-5852-fa83-a814-8e58dd120565@ramsayjones.plus.com> (raw)
In-Reply-To: <290ba923b5ee5bcaa4801454b6692deb532bd681.1587740959.git.congdanhqx@gmail.com>



On 24/04/2020 16:12, Đoàn Trần Công Danh wrote:
> Somewhere later in the code, we indirectly include alloca.h
> which will define alloca again, thus create a warning about
> redefinition of a preprocessor.
> 
> Include it prior to define alloca in order to not define it again.

So, on cygwin, this patch is not required. ie. I don't see any sparse
errors/warnings for compat/regex/regex.c.

Since cygwin uses a different c library (new-lib rather than glibc),
I did a quick test on Linux, thus:

  $ sparse --version
  v0.6.1-191-gc51a0382
  $ 
  $ git checkout master
  Switched to branch 'master'
  Your branch is up-to-date with 'origin/master'.
  $ 
  $ make clean
  GIT_VERSION = 2.26.2.266.ge870325ee8
  ...
  $ 
  $ make NO_REGEX=1 sparse >sp-out1 2>&1
  $ 
  $ diff sp-out sp-out1
  0a1,2
  > GIT_VERSION = 2.26.2.266.ge870325ee8
  >     * new build flags
  12a15
  >     * new prefix flags
  72a76
  >     GEN command-list.h
  226a231
  >     SP compat/regex/regex.c
  $ 
  $ make V=1 NO_REGEX=1 compat/regex/regex.sp
  cgcc -no-compile -Werror -Wall -Wdeclaration-after-statement -Wformat-security -Wold-style-definition -Woverflow -Wpointer-arith -Wstrict-prototypes -Wunused -Wvla -DENABLE_SHA256 -Wextra -Wmissing-prototypes -Wno-empty-body -Wno-missing-field-initializers -Wno-sign-compare -Wno-unused-parameter  -g -O2 -Wall -I. -DHAVE_SYSINFO -DGIT_HOST_CPU="\"x86_64\"" -DHAVE_ALLOCA_H -DUSE_CURL_FOR_IMAP_SEND -DSHA1_DC -DSHA1DC_NO_STANDARD_INCLUDES -DSHA1DC_INIT_SAFE_HASH_DEFAULT=0 -DSHA1DC_CUSTOM_INCLUDE_SHA1_C="\"cache.h\"" -DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C="\"git-compat-util.h\"" -DSHA256_BLK  -DHAVE_PATHS_H -DHAVE_DEV_TTY -DHAVE_CLOCK_GETTIME -DHAVE_CLOCK_MONOTONIC -DHAVE_GETDELIM '-DPROCFS_EXECUTABLE_PATH="/proc/self/exe"'  -DFREAD_READS_DIRECTORIES -DNO_STRLCPY -Icompat/regex -DSHELL_PATH='"/bin/sh"' -DPAGER_ENV='"LESS=FRX LV=-c"' -DGAWK -DNO_MBSUPPORT \
  	  compat/regex/regex.c
  $ 
   
So, again I don't see a problem. I guess it is possible that the
version of sparse I am using (see above) has _also_ fixed this
problem, in addition to the prototype attribute placement fix.

Another option is that the version of glibc also matters. (I am
on Linux Mint, which is based on Ubuntu 18.04 LTS) It would not
be the first time that I have seen errors in system header files
change from one release to the next ...

[Hmm, I have a fedora 31 system I could try - much more up-to-date! :D ]

ATB,
Ramsay Jones

> Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
> ---
>  compat/regex/regex.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/compat/regex/regex.c b/compat/regex/regex.c
> index f3e03a9eab..4bef75a716 100644
> --- a/compat/regex/regex.c
> +++ b/compat/regex/regex.c
> @@ -62,6 +62,7 @@
>  #include <stdint.h>
>  
>  #ifdef GAWK
> +#include <alloca.h>
>  #undef alloca
>  #define alloca alloca_is_bad_you_should_never_use_it
>  #endif
> 

  reply	other threads:[~2020-04-24 16:56 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-23 13:47 [PATCH 0/4] fix make sparse warning Đoàn Trần Công Danh
2020-04-23 13:47 ` [PATCH 1/4] C: s/0/NULL/ for pointer type Đoàn Trần Công Danh
2020-04-24  0:39   ` Ramsay Jones
2020-04-24  0:54     ` Junio C Hamano
2020-04-24  1:09       ` Danh Doan
2020-04-24  1:54         ` Junio C Hamano
2020-05-14 21:37       ` Luc Van Oostenryck
2020-04-23 13:47 ` [PATCH 2/4] compat/regex: silence `make sparse` warning Đoàn Trần Công Danh
2020-04-24  0:51   ` Ramsay Jones
2020-04-24  1:04     ` Danh Doan
2020-04-23 13:47 ` [PATCH 3/4] graph.c: limit linkage of internal variable Đoàn Trần Công Danh
2020-04-24  0:52   ` Ramsay Jones
2020-04-23 13:47 ` [PATCH 4/4] progress.c: silence cgcc suggestion about internal linkage Đoàn Trần Công Danh
2020-04-24  0:58   ` Ramsay Jones
2020-04-24  5:54     ` Jeff King
2020-04-23 13:47 ` [PATCH 5/4] fmt-merge-msg.c: fix `make sparse` on next Đoàn Trần Công Danh
2020-04-23 23:10 ` [PATCH 0/4] fix make sparse warning Ramsay Jones
2020-04-23 23:58   ` Danh Doan
2020-04-24 16:38     ` Ramsay Jones
2020-04-24 15:12 ` [PATCH v2 0/4] Fix Sparse Warning Đoàn Trần Công Danh
2020-04-24 15:12   ` [PATCH v2 1/4] test-parse-pathspec-file.c: s/0/NULL/ for pointer type Đoàn Trần Công Danh
2020-04-24 15:12   ` [PATCH v2 2/4] compat/regex: include alloca.h before undef it Đoàn Trần Công Danh
2020-04-24 16:56     ` Ramsay Jones [this message]
2020-04-24 17:09       ` Danh Doan
2020-04-24 18:29         ` Ramsay Jones
2020-04-24 22:34           ` Danh Doan
2020-04-25 20:28             ` Ramsay Jones
2020-04-26  0:54               ` Danh Doan
2020-04-26  1:10                 ` Danh Doan
2020-04-26 16:17                 ` Ramsay Jones
2020-04-26 19:38                   ` Ramsay Jones
2020-04-26 22:37                     ` Junio C Hamano
2020-04-27  1:08                   ` Danh Doan
2020-04-27 16:28                     ` Ramsay Jones
2020-04-27 16:46                       ` Danh Doan
2020-04-27 17:21                         ` Ramsay Jones
2020-04-24 15:12   ` [PATCH v2 3/4] graph.c: limit linkage of internal variable Đoàn Trần Công Danh
2020-04-24 15:12   ` [PATCH v2 4/4] progress.c: silence cgcc suggestion about internal linkage Đoàn Trần Công Danh
2020-04-24 16:40   ` [PATCH v2 0/4] Fix Sparse Warning Ramsay Jones
2020-04-25 13:13 ` [PATCH 0/4] fix make sparse warning Johannes Schindelin
2020-04-26  3:32   ` Danh Doan
2020-04-26 16:24     ` Ramsay Jones
2020-05-01 20:02       ` Johannes Schindelin
2020-04-27 14:22 ` [PATCH v3 0/4] Partial fix `make sparse` Đoàn Trần Công Danh
2020-04-27 14:22   ` [PATCH v3 1/4] test-parse-pathspec-file.c: s/0/NULL/ for pointer type Đoàn Trần Công Danh
2020-04-27 14:22   ` [PATCH v3 2/4] compat/regex: move stdlib.h up in inclusion chain Đoàn Trần Công Danh
2020-04-27 16:41     ` Ramsay Jones
2020-04-27 14:22   ` [PATCH v3 3/4] graph.c: limit linkage of internal variable Đoàn Trần Công Danh
2020-04-27 14:22   ` [PATCH v3 4/4] progress.c: silence cgcc suggestion about internal linkage Đoàn Trần Công Danh
2020-05-01 20:09     ` Johannes Schindelin
2020-04-27 16:35   ` [PATCH v3 0/4] Partial fix `make sparse` Ramsay Jones

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