From: Jo-Philipp Wich <jow@openwrt.org>
Date: Mon, 12 Dec 2011 17:26:13 +0000
Subject: [PATCH] hostapd: support optional argument for the -v switch of
 hostapd and wpa_supplicant to query build features, e.g. hostapd -veap to
 test whether 802.11i support is compiled in

--- a/hostapd/main.c
+++ b/hostapd/main.c
@@ -31,7 +31,7 @@
 #include "config_file.h"
 #include "eap_register.h"
 #include "ctrl_iface.h"
-
+#include "build_features.h"
 
 struct hapd_global {
 	void **drv_priv;
@@ -806,7 +806,7 @@ int main(int argc, char *argv[])
 	wpa_supplicant_event = hostapd_wpa_event;
 	wpa_supplicant_event_global = hostapd_wpa_event_global;
 	for (;;) {
-		c = getopt(argc, argv, "b:Bde:f:hi:KP:sSTtu:vg:G:q");
+		c = getopt(argc, argv, "b:Bde:f:hi:KP:sSTtu:g:G:qv::");
 		if (c < 0)
 			break;
 		switch (c) {
@@ -843,6 +843,8 @@ int main(int argc, char *argv[])
 			break;
 #endif /* CONFIG_DEBUG_LINUX_TRACING */
 		case 'v':
+			if (optarg)
+				exit(!has_feature(optarg));
 			show_version();
 			exit(1);
 		case 'g':
--- a/wpa_supplicant/main.c
+++ b/wpa_supplicant/main.c
@@ -12,6 +12,7 @@
 #endif /* __linux__ */
 
 #include "common.h"
+#include "build_features.h"
 #include "crypto/crypto.h"
 #include "fst/fst.h"
 #include "wpa_supplicant_i.h"
@@ -202,7 +203,7 @@ int main(int argc, char *argv[])
 
 	for (;;) {
 		c = getopt(argc, argv,
-			   "b:Bc:C:D:de:f:g:G:hi:I:KLMm:No:O:p:P:qsTtuvW");
+			   "b:Bc:C:D:de:f:g:G:hi:I:KLMm:No:O:p:P:qsTtuv::W");
 		if (c < 0)
 			break;
 		switch (c) {
@@ -302,8 +303,12 @@ int main(int argc, char *argv[])
 			break;
 #endif /* CONFIG_CTRL_IFACE_DBUS_NEW */
 		case 'v':
-			printf("%s\n", wpa_supplicant_version);
-			exitcode = 0;
+			if (optarg) {
+				exitcode = !has_feature(optarg);
+			} else {
+				printf("%s\n", wpa_supplicant_version);
+				exitcode = 0;
+			}
 			goto out;
 		case 'W':
 			params.wait_for_monitor++;