--- zzzz-none-000/linux-3.10.107/scripts/kconfig/zconf.l	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/scripts/kconfig/zconf.l	2021-02-04 17:41:59.000000000 +0000
@@ -27,8 +27,8 @@
 static int text_size, text_asize;
 
 struct buffer {
-        struct buffer *parent;
-        YY_BUFFER_STATE state;
+	struct buffer *parent;
+	YY_BUFFER_STATE state;
 };
 
 struct buffer *current_buf;
@@ -66,10 +66,16 @@
 	memcpy(text, str, size);
 	text[size] = 0;
 }
+
+static void warn_ignored_character(char chr)
+{
+	fprintf(stderr,
+	        "%s:%d:warning: ignoring unsupported character '%c'\n",
+	        zconf_curname(), zconf_lineno(), chr);
+}
 %}
 
-ws	[ \n\t]
-n	[A-Za-z0-9_]
+n	[A-Za-z0-9_-]
 
 %%
 	int str = 0;
@@ -107,7 +113,7 @@
 		zconflval.string = text;
 		return T_WORD;
 	}
-	.
+	.	warn_ignored_character(*yytext);
 	\n	{
 		BEGIN(INITIAL);
 		current_file->lineno++;
@@ -123,14 +129,17 @@
 	"!"	return T_NOT;
 	"="	return T_EQUAL;
 	"!="	return T_UNEQUAL;
+	"<="	return T_LESS_EQUAL;
+	">="	return T_GREATER_EQUAL;
+	"<"	return T_LESS;
+	">"	return T_GREATER;
 	\"|\'	{
 		str = yytext[0];
 		new_string();
 		BEGIN(STRING);
 	}
 	\n	BEGIN(INITIAL); current_file->lineno++; return T_EOL;
-	---	/* ignore */
-	({n}|[-/.])+	{
+	({n}|[/.])+	{
 		const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 		if (id && id->flags & TF_PARAM) {
 			zconflval.id = id;
@@ -142,7 +151,8 @@
 	}
 	#.*	/* comment */
 	\\\n	current_file->lineno++;
-	.
+	[[:blank:]]+
+	.	warn_ignored_character(*yytext);
 	<<EOF>> {
 		BEGIN(INITIAL);
 	}