--- a/hostapd/Makefile
+++ b/hostapd/Makefile
@@ -28,6 +28,7 @@ CFLAGS += -I$(abspath ../src/utils)
 export BINDIR ?= /usr/local/bin/
 
 -include .config
+-include $(if $(MULTICALL), ../wpa_supplicant/.config)
 
 ifndef CONFIG_NO_GITVER
 # Add VERSION_STR postfix for builds from a git repository
@@ -198,7 +199,8 @@ endif
 
 ifdef CONFIG_NO_VLAN
 CFLAGS += -DCONFIG_NO_VLAN
-else
+endif
+ifneq ($(findstring CONFIG_NO_VLAN,$(CFLAGS)), CONFIG_NO_VLAN)
 OBJS += ../src/ap/vlan_init.o
 OBJS += ../src/ap/vlan_ifconfig.o
 OBJS += ../src/ap/vlan.o
@@ -330,10 +332,14 @@ CFLAGS += -DCONFIG_MBO
 OBJS += ../src/ap/mbo_ap.o
 endif
 
+ifndef MULTICALL
+CFLAGS += -DNO_SUPPLICANT
+endif
+
 include ../src/drivers/drivers.mak
-OBJS += $(DRV_AP_OBJS)
-CFLAGS += $(DRV_AP_CFLAGS)
-LDFLAGS += $(DRV_AP_LDFLAGS)
+OBJS += $(sort $(DRV_AP_OBJS) $(if $(MULTICALL),$(DRV_WPA_OBJS)))
+CFLAGS += $(DRV_AP_CFLAGS) $(if $(MULTICALL),$(DRV_WPA_CFLAGS))
+LDFLAGS += $(DRV_AP_LDFLAGS) $(if $(MULTICALL),$(DRV_WPA_LDFLAGS))
 LIBS += $(DRV_AP_LIBS)
 
 ifdef CONFIG_L2_PACKET
@@ -1077,6 +1083,12 @@ install: $(addprefix $(DESTDIR)$(BINDIR)
 
 BCHECK=../src/drivers/build.hostapd
 
+hostapd_multi.a: $(BCHECK) $(OBJS)
+	$(Q)$(CC) -c -o hostapd_multi.o -Dmain=hostapd_main $(CFLAGS) main.c
+	@$(E) "  CC " $<
+	@rm -f $@
+	@$(AR) cr $@ hostapd_multi.o $(OBJS)
+
 hostapd: $(BCHECK) $(OBJS)
 	$(Q)$(CC) $(LDFLAGS) -o hostapd $(OBJS) $(LIBS)
 	@$(E) "  LD " $@
@@ -1118,6 +1130,12 @@ HOBJS += ../src/crypto/aes-internal.o
 HOBJS += ../src/crypto/aes-internal-enc.o
 endif
 
+dump_cflags:
+	@printf "%s " "$(CFLAGS)"
+
+dump_ldflags:
+	@printf "%s " "$(LDFLAGS) $(LIBS) $(EXTRALIBS)"
+
 nt_password_hash: $(NOBJS)
 	$(Q)$(CC) $(LDFLAGS) -o nt_password_hash $(NOBJS) $(LIBS_n)
 	@$(E) "  LD " $@
--- a/wpa_supplicant/Makefile
+++ b/wpa_supplicant/Makefile
@@ -27,6 +27,7 @@ CFLAGS += -I$(abspath ../src)
 CFLAGS += -I$(abspath ../src/utils)
 
 -include .config
+-include $(if $(MULTICALL),../hostapd/.config)
 
 ifndef CONFIG_NO_GITVER
 # Add VERSION_STR postfix for builds from a git repository
@@ -329,7 +330,9 @@ endif
 ifdef CONFIG_IBSS_RSN
 NEED_RSN_AUTHENTICATOR=y
 CFLAGS += -DCONFIG_IBSS_RSN
+ifndef MULTICALL
 CFLAGS += -DCONFIG_NO_VLAN
+endif
 OBJS += ibss_rsn.o
 endif
 
@@ -820,6 +823,10 @@ ifdef CONFIG_DYNAMIC_EAP_METHODS
 CFLAGS += -DCONFIG_DYNAMIC_EAP_METHODS
 LIBS += -ldl -rdynamic
 endif
+else
+  ifdef MULTICALL
+    OBJS += ../src/eap_common/eap_common.o
+  endif
 endif
 
 ifdef CONFIG_MACSEC
@@ -840,9 +847,11 @@ NEED_EAP_COMMON=y
 NEED_RSN_AUTHENTICATOR=y
 CFLAGS += -DCONFIG_AP
 OBJS += ap.o
+ifndef MULTICALL
 CFLAGS += -DCONFIG_NO_RADIUS
 CFLAGS += -DCONFIG_NO_ACCOUNTING
 CFLAGS += -DCONFIG_NO_VLAN
+endif
 OBJS += ../src/ap/hostapd.o
 OBJS += ../src/ap/wpa_auth_glue.o
 OBJS += ../src/ap/utils.o
@@ -910,6 +919,12 @@ endif
 ifdef CONFIG_HS20
 OBJS += ../src/ap/hs20.o
 endif
+else
+  ifdef MULTICALL
+    OBJS += ../src/eap_server/eap_server.o
+    OBJS += ../src/eap_server/eap_server_identity.o
+    OBJS += ../src/eap_server/eap_server_methods.o
+  endif
 endif
 
 ifdef CONFIG_MBO
@@ -918,7 +933,9 @@ CFLAGS += -DCONFIG_MBO
 endif
 
 ifdef NEED_RSN_AUTHENTICATOR
+ifndef MULTICALL
 CFLAGS += -DCONFIG_NO_RADIUS
+endif
 NEED_AES_WRAP=y
 OBJS += ../src/ap/wpa_auth.o
 OBJS += ../src/ap/wpa_auth_ie.o
@@ -1706,6 +1723,12 @@ wpa_priv: $(BCHECK) $(OBJS_priv)
 
 $(OBJS_c) $(OBJS_t) $(OBJS_t2) $(OBJS) $(BCHECK) $(EXTRA_progs): .config
 
+wpa_supplicant_multi.a: .config $(BCHECK) $(OBJS) $(EXTRA_progs)
+	$(Q)$(CC) -c -o wpa_supplicant_multi.o -Dmain=wpa_supplicant_main $(CFLAGS) main.c
+	@$(E) "  CC " $<
+	@rm -f $@
+	@$(AR) cr $@ wpa_supplicant_multi.o $(OBJS)
+
 wpa_supplicant: $(BCHECK) $(OBJS) $(EXTRA_progs)
 	$(Q)$(LDO) $(LDFLAGS) -o wpa_supplicant $(OBJS) $(LIBS) $(EXTRALIBS)
 	@$(E) "  LD " $@
@@ -1808,6 +1831,12 @@ endif
 		-e 's|\@DBUS_INTERFACE\@|$(DBUS_INTERFACE)|g' $< >$@
 	@$(E) "  sed" $<
 
+dump_cflags:
+	@printf "%s " "$(CFLAGS)"
+
+dump_ldflags:
+	@printf "%s " "$(LDFLAGS) $(LIBS) $(EXTRALIBS)"
+
 wpa_supplicant.exe: wpa_supplicant
 	mv -f $< $@
 wpa_cli.exe: wpa_cli
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -4968,8 +4968,8 @@ union wpa_event_data {
  * Driver wrapper code should call this function whenever an event is received
  * from the driver.
  */
-void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
-			  union wpa_event_data *data);
+extern void (*wpa_supplicant_event)(void *ctx, enum wpa_event_type event,
+				    union wpa_event_data *data);
 
 /**
  * wpa_supplicant_event_global - Report a driver event for wpa_supplicant
@@ -4981,7 +4981,7 @@ void wpa_supplicant_event(void *ctx, enu
  * Same as wpa_supplicant_event(), but we search for the interface in
  * wpa_global.
  */
-void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
+extern void (*wpa_supplicant_event_global)(void *ctx, enum wpa_event_type event,
 				 union wpa_event_data *data);
 
 /*
--- a/src/ap/drv_callbacks.c
+++ b/src/ap/drv_callbacks.c
@@ -1163,8 +1163,8 @@ static void hostapd_event_dfs_cac_starte
 #endif /* NEED_AP_MLME */
 
 
-void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
-			  union wpa_event_data *data)
+void hostapd_wpa_event(void *ctx, enum wpa_event_type event,
+		       union wpa_event_data *data)
 {
 	struct hostapd_data *hapd = ctx;
 #ifndef CONFIG_NO_STDOUT_DEBUG
@@ -1373,7 +1373,7 @@ void wpa_supplicant_event(void *ctx, enu
 }
 
 
-void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
+void hostapd_wpa_event_global(void *ctx, enum wpa_event_type event,
 				 union wpa_event_data *data)
 {
 	struct hapd_interfaces *interfaces = ctx;
--- a/wpa_supplicant/wpa_priv.c
+++ b/wpa_supplicant/wpa_priv.c
@@ -1031,8 +1031,8 @@ static void wpa_priv_send_ft_response(st
 }
 
 
-void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
-			  union wpa_event_data *data)
+static void supplicant_event(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data)
 {
 	struct wpa_priv_interface *iface = ctx;
 
@@ -1101,7 +1101,7 @@ void wpa_supplicant_event(void *ctx, enu
 }
 
 
-void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
+void supplicant_event_global(void *ctx, enum wpa_event_type event,
 				 union wpa_event_data *data)
 {
 	struct wpa_priv_global *global = ctx;
@@ -1213,6 +1213,8 @@ int main(int argc, char *argv[])
 	if (os_program_init())
 		return -1;
 
+	wpa_supplicant_event = supplicant_event;
+	wpa_supplicant_event_global = supplicant_event_global;
 	wpa_priv_fd_workaround();
 
 	os_memset(&global, 0, sizeof(global));
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -3610,8 +3610,8 @@ static void wpa_supplicant_event_assoc_a
 }
 
 
-void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
-			  union wpa_event_data *data)
+void supplicant_event(void *ctx, enum wpa_event_type event,
+		      union wpa_event_data *data)
 {
 	struct wpa_supplicant *wpa_s = ctx;
 	int resched;
@@ -4315,7 +4315,7 @@ void wpa_supplicant_event(void *ctx, enu
 #endif /* CONFIG_AP */
 		break;
 	case EVENT_ACS_CHANNEL_SELECTED:
-#ifdef CONFIG_ACS
+#if defined(CONFIG_ACS) && defined(CONFIG_AP)
 		if (!wpa_s->ap_iface)
 			break;
 		hostapd_acs_channel_selected(wpa_s->ap_iface->bss[0],
@@ -4337,7 +4337,7 @@ void wpa_supplicant_event(void *ctx, enu
 }
 
 
-void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
+void supplicant_event_global(void *ctx, enum wpa_event_type event,
 				 union wpa_event_data *data)
 {
 	struct wpa_supplicant *wpa_s;
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -5136,7 +5136,6 @@ struct wpa_interface * wpa_supplicant_ma
 	return NULL;
 }
 
-
 /**
  * wpa_supplicant_match_existing - Match existing interfaces
  * @global: Pointer to global data from wpa_supplicant_init()
@@ -5173,6 +5172,11 @@ static int wpa_supplicant_match_existing
 
 #endif /* CONFIG_MATCH_IFACE */
 
+extern void supplicant_event(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
+
+extern void supplicant_event_global(void *ctx, enum wpa_event_type event,
+ 				 union wpa_event_data *data);
 
 /**
  * wpa_supplicant_add_iface - Add a new network interface
@@ -5428,6 +5432,8 @@ struct wpa_global * wpa_supplicant_init(
 #ifndef CONFIG_NO_WPA_MSG
 	wpa_msg_register_ifname_cb(wpa_supplicant_msg_ifname_cb);
 #endif /* CONFIG_NO_WPA_MSG */
+	wpa_supplicant_event = supplicant_event;
+	wpa_supplicant_event_global = supplicant_event_global;
 
 	if (params->wpa_debug_file_path)
 		wpa_debug_open_file(params->wpa_debug_file_path);
--- a/hostapd/main.c
+++ b/hostapd/main.c
@@ -590,6 +590,11 @@ fail:
 	return -1;
 }
 
+void hostapd_wpa_event(void *ctx, enum wpa_event_type event,
+                       union wpa_event_data *data);
+
+void hostapd_wpa_event_global(void *ctx, enum wpa_event_type event,
+ 				 union wpa_event_data *data);
 
 #ifdef CONFIG_WPS
 static int gen_uuid(const char *txt_addr)
@@ -667,6 +672,8 @@ int main(int argc, char *argv[])
 	interfaces.global_ctrl_sock = -1;
 	dl_list_init(&interfaces.global_ctrl_dst);
 
+	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:");
 		if (c < 0)
--- a/src/drivers/drivers.c
+++ b/src/drivers/drivers.c
@@ -10,6 +10,10 @@
 #include "utils/common.h"
 #include "driver.h"
 
+void (*wpa_supplicant_event)(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
+void (*wpa_supplicant_event_global)(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
 
 const struct wpa_driver_ops *const wpa_drivers[] =
 {
--- a/wpa_supplicant/eapol_test.c
+++ b/wpa_supplicant/eapol_test.c
@@ -29,7 +29,12 @@
 #include "ctrl_iface.h"
 #include "pcsc_funcs.h"
 #include "wpas_glue.h"
+#include "drivers/driver.h"
 
+void (*wpa_supplicant_event)(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
+void (*wpa_supplicant_event_global)(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
 
 const struct wpa_driver_ops *const wpa_drivers[] = { NULL };
 
@@ -1295,6 +1300,10 @@ static void usage(void)
 	       "option several times.\n");
 }
 
+extern void supplicant_event(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
+extern void supplicant_event_global(void *ctx, enum wpa_event_type event,
+			     union wpa_event_data *data);
 
 int main(int argc, char *argv[])
 {
@@ -1315,6 +1324,8 @@ int main(int argc, char *argv[])
 	if (os_program_init())
 		return -1;
 
+	wpa_supplicant_event = supplicant_event;
+	wpa_supplicant_event_global = supplicant_event_global;
 	hostapd_logger_register_cb(hostapd_logger_cb);
 
 	os_memset(&eapol_test, 0, sizeof(eapol_test));
