[PATCH 2/2] kconfig/conf: add command line options' description

[Arnaud Lacombe <lacombar@gmail.com>]

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
---
 scripts/kconfig/conf.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 057f49a..5297dbf 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -468,8 +468,28 @@ static struct option long_opts[] = {
 	{NULL, 0, NULL, 0}
 };
 
+static void conf_usage(const char *progname)
+{
+
+	printf("Usage: %s [option] <kconfig-file>\n", progname);
+	printf("Option is one of the following:\n");
+	printf("  --listnewconfig         List new options\n");
+	printf("  --oldaskconfig          Start a new configuration using a line-oriented program\n");
+	printf("  --oldconfig             Update a configuration using a provided .config as base\n");
+	printf("  --silentoldconfig       Same as oldconfig, but quietly, additionally update deps\n");
+	printf("  --oldnoconfig           Same as silentoldconfig but set new symbols to no\n");
+	printf("  --defconfig [arg]       New config with default defined in the kconfig-filedefconfig\n");
+	printf("  --savedefconfig <file>  Save the minimal current configuration to <file>\n");
+	printf("  --allnoconfig           New config where all options are answered with no\n");
+	printf("  --allyesconfig          New config where all options are answered with yes\n");
+	printf("  --allmodconfig          New config where all options are answered with mod\n");
+	printf("  --alldefconfig          New config with all symbols set to default\n");
+	printf("  --randconfig            New config with random answer to all options\n");
+}
+
 int main(int ac, char **av)
 {
+	const char *progname = av[0];
 	int opt;
 	const char *name;
 	struct stat tmpstat;
@@ -503,10 +523,23 @@ int main(int ac, char **av)
 			srand(seed);
 			break;
 		}
+		case oldaskconfig:
+		case oldconfig:
+		case allnoconfig:
+		case allyesconfig:
+		case allmodconfig:
+		case alldefconfig:
+		case listnewconfig:
+		case oldnoconfig:
+			break;
+		default:
+			conf_usage(progname);
+			exit(1);
 		}
 	}
 	if (ac == optind) {
 		printf(_("%s: Kconfig file missing\n"), av[0]);
+		conf_usage(progname);
 		exit(1);
 	}
 	name = av[optind];
-- 
1.7.2.30.gc37d7.dirty