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From: Duy Nguyen <pclouds@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: avarab@gmail.com, git@vger.kernel.org, sunshine@sunshineco.com,
	szeder.dev@gmail.com
Subject: Re: [PATCH] parse-options: fix SunCC compiler warning
Date: Mon, 10 Dec 2018 16:26:42 +0100	[thread overview]
Message-ID: <20181210152642.GA16203@duynguyen.home> (raw)
In-Reply-To: <xmqqy38xkhvd.fsf@gitster-ct.c.googlers.com>

On Mon, Dec 10, 2018 at 03:36:54PM +0900, Junio C Hamano wrote:
> Nguyễn Thái Ngọc Duy  <pclouds@gmail.com> writes:
> 
> > The compiler reports this because show_gitcomp() never actually
> > returns a value:
> >
> >     "parse-options.c", line 520: warning: Function has no return
> >     statement : show_gitcomp
> >
> > The function calls exit() and will never return. Update and mark it
> > NORETURN.
> 
> Yuck.  This should do for now, but I am not impressed by the choice
> to hook show_gitcomp() call into parse_options_step(), which forces
> such an abnormal exit deeper in the callchain [*1*].  For readers
> (not compilers), it would help to have a comment at the caller that
> says that show_gitcomp() never returns and exits.
> 
> 	side note #1.  Perhaps parse_options_start() would have been
> 	a better place, instead of parse_options_step() that is
> 	repeatedly called in a loop and itself has a loop.  ANd
> 	worse yet, the check is done inside the loop even though the
> 	call is to be made only when the --git-completion-helper
> 	option is given as the sole request.

The reason it's in parse_options_step() is because -h is also handled
in there. Although -h does not bury exit() deep in the call chain. So
how about this as a replacement?

-- 8< --
diff --git a/parse-options.c b/parse-options.c
index 3b874a83a0..6932eaff61 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -516,7 +516,7 @@ static int show_gitcomp(struct parse_opt_ctx_t *ctx,
 	show_negated_gitcomp(original_opts, -1);
 	show_negated_gitcomp(original_opts, nr_noopts);
 	fputc('\n', stdout);
-	exit(0);
+	return PARSE_OPT_COMPLETE;
 }
 
 static int usage_with_options_internal(struct parse_opt_ctx_t *,
@@ -638,6 +638,8 @@ int parse_options(int argc, const char **argv, const char *prefix,
 	case PARSE_OPT_HELP:
 	case PARSE_OPT_ERROR:
 		exit(129);
+	case PARSE_OPT_COMPLETE:
+		exit(0);
 	case PARSE_OPT_NON_OPTION:
 	case PARSE_OPT_DONE:
 		break;
diff --git a/parse-options.h b/parse-options.h
index 6c4fe2016d..a650a7d220 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -208,6 +208,7 @@ extern int opterror(const struct option *opt, const char *reason, int flags);
 /*----- incremental advanced APIs -----*/
 
 enum {
+	PARSE_OPT_COMPLETE = -2,
 	PARSE_OPT_HELP = -1,
 	PARSE_OPT_DONE,
 	PARSE_OPT_NON_OPTION,
-- 8< --

  reply	other threads:[~2018-12-10 15:26 UTC|newest]

Thread overview: 127+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-31 11:05 [PATCH v2 00/41] Automate updating git-completion.bash a bit Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 01/41] parse-options: support --git-completion-helper Nguyễn Thái Ngọc Duy
2018-01-31 20:22   ` Eric Sunshine
2018-01-31 21:04   ` Eric Sunshine
2018-02-01  0:05     ` Duy Nguyen
2018-02-01  9:54       ` Eric Sunshine
2018-02-01 10:21         ` Duy Nguyen
2018-02-01 19:16           ` Eric Sunshine
2018-02-05  9:56             ` Duy Nguyen
2018-02-06  5:04               ` Eric Sunshine
2018-02-07 23:41                 ` SZEDER Gábor
2018-02-05 10:46     ` Ævar Arnfjörð Bjarmason
2018-02-05 11:22       ` Duy Nguyen
2018-01-31 11:05 ` [PATCH v2 02/41] parse-options: add OPT_xxx_F() variants Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 03/41] parse-options: let OPT__FORCE take optional flags argument Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 04/41] git-completion.bash: introduce __gitcomp_builtin Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 05/41] completion: use __gitcomp_builtin in _git_add Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 06/41] completion: use __gitcomp_builtin in _git_am Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 07/41] completion: use __gitcomp_builtin in _git_apply Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 08/41] completion: use __gitcomp_builtin in _git_branch Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 09/41] completion: use __gitcomp_builtin in _git_checkout Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 10/41] completion: use __gitcomp_builtin in _git_cherry_pick Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 11/41] completion: use __gitcomp_builtin in _git_clean Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 12/41] completion: use __gitcomp_builtin in _git_clone Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 13/41] completion: use __gitcomp_builtin in _git_commit Nguyễn Thái Ngọc Duy
2018-01-31 20:42   ` Eric Sunshine
2018-01-31 11:05 ` [PATCH v2 14/41] completion: use __gitcomp_builtin in _git_config Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 15/41] completion: use __gitcomp_builtin in _git_describe Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 16/41] completion: use __gitcomp_builtin in _git_difftool Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 17/41] completion: use __gitcomp_builtin in _git_fetch Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 18/41] completion: use __gitcomp_builtin in _git_fsck Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 19/41] completion: use __gitcomp_builtin in _git_gc Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 20/41] completion: use __gitcomp_builtin in _git_grep Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 21/41] completion: use __gitcomp_builtin in _git_help Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 22/41] completion: use __gitcomp_builtin in _git_init Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 23/41] completion: use __gitcomp_builtin in _git_ls_files Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 24/41] completion: use __gitcomp_builtin in _git_ls_remote Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 25/41] completion: use __gitcomp_builtin in _git_merge Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 26/41] completion: use __gitcomp_builtin in _git_merge_base Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 27/41] completion: use __gitcomp_builtin in _git_mv Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 28/41] completion: use __gitcomp_builtin in _git_name_rev Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 29/41] completion: use __gitcomp_builtin in _git_notes Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 30/41] completion: use __gitcomp_builtin in _git_pull Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 31/41] completion: use __gitcomp_builtin in _git_push Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 32/41] completion: use __gitcomp_builtin in _git_remote Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 33/41] remote: force completing --mirror= instead of --mirror Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 34/41] completion: use __gitcomp_builtin in _git_replace Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 35/41] completion: use __gitcomp_builtin in _git_reset Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 36/41] completion: use __gitcomp_builtin in _git_revert Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 37/41] completion: use __gitcomp_builtin in _git_rm Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 38/41] completion: use __gitcomp_builtin in _git_show_branch Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 39/41] completion: use __gitcomp_builtin in _git_status Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 40/41] completion: use __gitcomp_builtin in _git_tag Nguyễn Thái Ngọc Duy
2018-01-31 11:05 ` [PATCH v2 41/41] completion: use __gitcomp_builtin in _git_worktree Nguyễn Thái Ngọc Duy
2018-01-31 15:01 ` [PATCH v2 00/41] Automate updating git-completion.bash a bit Ævar Arnfjörð Bjarmason
2018-02-07 19:23 ` Junio C Hamano
2018-02-08 12:05   ` Duy Nguyen
2018-02-09 11:01 ` [PATCH v3 00/42] " Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 01/42] parse-options: support --git-completion-helper Nguyễn Thái Ngọc Duy
2018-12-02 13:41     ` Ævar Arnfjörð Bjarmason
2018-12-09 10:27       ` [PATCH] parse-options: fix SunCC compiler warning Nguyễn Thái Ngọc Duy
2018-12-10  6:36         ` Junio C Hamano
2018-12-10 15:26           ` Duy Nguyen [this message]
2018-12-11  2:13             ` Junio C Hamano
2018-12-11 15:40               ` Duy Nguyen
2018-12-12  7:50                 ` Junio C Hamano
2018-12-11 15:35         ` [PATCH v2] " Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 02/42] parse-options: add OPT_xxx_F() variants Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 03/42] parse-options: let OPT__FORCE take optional flags argument Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 04/42] git-completion.bash: introduce __gitcomp_builtin Nguyễn Thái Ngọc Duy
2018-02-09 18:59     ` Junio C Hamano
2018-02-14 15:35     ` SZEDER Gábor
2018-02-23 10:30       ` Duy Nguyen
2018-02-09 11:01   ` [PATCH v3 05/42] completion: use __gitcomp_builtin in _git_add Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 06/42] completion: use __gitcomp_builtin in _git_am Nguyễn Thái Ngọc Duy
2018-02-14 12:53     ` SZEDER Gábor
2018-02-22  9:13       ` Duy Nguyen
2018-02-22 18:19         ` Junio C Hamano
2018-02-23 10:17           ` Duy Nguyen
2018-02-23 18:08             ` Junio C Hamano
2018-02-24 13:58               ` Duy Nguyen
2018-02-09 11:01   ` [PATCH v3 07/42] completion: use __gitcomp_builtin in _git_apply Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 08/42] completion: use __gitcomp_builtin in _git_branch Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 09/42] completion: use __gitcomp_builtin in _git_checkout Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 10/42] completion: use __gitcomp_builtin in _git_cherry_pick Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 11/42] completion: use __gitcomp_builtin in _git_clean Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 12/42] completion: use __gitcomp_builtin in _git_clone Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 13/42] completion: use __gitcomp_builtin in _git_commit Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 14/42] completion: use __gitcomp_builtin in _git_config Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 15/42] completion: use __gitcomp_builtin in _git_describe Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 16/42] completion: use __gitcomp_builtin in _git_difftool Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 17/42] completion: use __gitcomp_builtin in _git_fetch Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 18/42] completion: use __gitcomp_builtin in _git_fsck Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 19/42] completion: use __gitcomp_builtin in _git_gc Nguyễn Thái Ngọc Duy
2018-02-09 11:01   ` [PATCH v3 20/42] completion: use __gitcomp_builtin in _git_grep Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 21/42] completion: use __gitcomp_builtin in _git_help Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 22/42] completion: use __gitcomp_builtin in _git_init Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 23/42] completion: use __gitcomp_builtin in _git_ls_files Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 24/42] completion: use __gitcomp_builtin in _git_ls_remote Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 25/42] completion: use __gitcomp_builtin in _git_merge Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 26/42] completion: use __gitcomp_builtin in _git_merge_base Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 27/42] completion: use __gitcomp_builtin in _git_mv Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 28/42] completion: use __gitcomp_builtin in _git_name_rev Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 29/42] completion: use __gitcomp_builtin in _git_notes Nguyễn Thái Ngọc Duy
2018-02-14 14:29     ` SZEDER Gábor
2018-02-23 10:33       ` Duy Nguyen
2018-02-23 10:59         ` Duy Nguyen
2018-02-14 15:15     ` SZEDER Gábor
2018-02-23 10:40       ` Duy Nguyen
2018-02-09 11:02   ` [PATCH v3 30/42] completion: use __gitcomp_builtin in _git_pull Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 31/42] completion: use __gitcomp_builtin in _git_push Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 32/42] completion: use __gitcomp_builtin in _git_remote Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 33/42] remote: force completing --mirror= instead of --mirror Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 34/42] completion: use __gitcomp_builtin in _git_replace Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 35/42] completion: use __gitcomp_builtin in _git_reset Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 36/42] completion: use __gitcomp_builtin in _git_revert Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 37/42] completion: use __gitcomp_builtin in _git_rm Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 38/42] completion: use __gitcomp_builtin in _git_show_branch Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 39/42] completion: use __gitcomp_builtin in _git_status Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 40/42] completion: use __gitcomp_builtin in _git_tag Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 41/42] completion: use __gitcomp_builtin in _git_worktree Nguyễn Thái Ngọc Duy
2018-02-09 11:02   ` [PATCH v3 42/42] git-completion.bash: add GIT_COMPLETION_OPTIONS=all config Nguyễn Thái Ngọc Duy
2018-02-09 14:19     ` Ævar Arnfjörð Bjarmason
2018-02-10  9:29       ` Duy Nguyen
2018-02-11 14:47         ` Ævar Arnfjörð Bjarmason
2018-02-11  1:59     ` Eric Sunshine
2018-02-12  0:34       ` Duy Nguyen

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