linux-kernel - [PATCH 1/2] kconfig: also warn of unhandled characters in statements

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Message-Id: <a2424e6c57a4d6c38369c393ba58e0d050b7c130.1435927467.git.andreas.ruprecht@fau.de>
Date:	Fri,  3 Jul 2015 14:46:38 +0200
From:	Andreas Ruprecht <andreas.ruprecht@....de>
To:	Ulf Magnusson <ulfalizer.lkml@...il.com>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	rafael.j.wysocki@...el.com, <linux-kbuild@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	hengelein Stefan <stefan.hengelein@....de>,
	linux@...inikbrodowski.net, Michal Marek <mmarek@...e.cz>,
	Andreas Ruprecht <andreas.ruprecht@....de>
Subject: [PATCH 1/2] kconfig: also warn of unhandled characters in statements

While commit 2e0d737fc76f ("kconfig: don't silently ignore unhandled
characters") introduced a warning for unsupported characters inside
parameters, it does not cover situations where a statement
has additional characters around it.

This change introduces a warning if superfluous characters are found
around statements. As the 'help' statement sometimes is written as
'---help---', the '-' character would now also be regarded as
unhandled, this change also adds a special rule for this case.

Reported-by: Valentin Rothberg <valentinrothberg@...il.com>
Signed-off-by: Andreas Ruprecht <andreas.ruprecht@....de>
---
 scripts/kconfig/zconf.l | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
index 200a3fe..84a5d05 100644
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/zconf.l
@@ -106,7 +106,15 @@ n	[A-Za-z0-9_]
 		zconflval.string = text;
 		return T_WORD;
 	}
-	.
+	"---help---"	{
+		/* Support old syntax for help statement */
+		return T_HELP;
+	}
+	.	{
+		fprintf(stderr,
+		        "%s:%d:warning: ignoring unsupported character '%c'\n",
+		        zconf_curname(), zconf_lineno(), *yytext);
+	}
 	\n	{
 		BEGIN(INITIAL);
 		current_file->lineno++;
@@ -132,7 +140,6 @@ n	[A-Za-z0-9_]
 		BEGIN(STRING);
 	}
 	\n	BEGIN(INITIAL); current_file->lineno++; return T_EOL;
-	---	/* ignore */
 	({n}|[-/.])+	{
 		const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 		if (id && id->flags & TF_PARAM) {
-- 
1.9.1

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