wpa_supplicant: mark global variables defined in headers 'extern'

...to avoid defining common symbols.
GCC since version 10 defaults to -fno-common and doesn't generate
common symbols, leading to duplicate definitions of these symbols.

components/wpa_supplicant/esp_supplicant/include/esp_wpa.h

@@ -1,16 +1,8 @@
-// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
+/*
-//
+ * SPDX-FileCopyrightText: 2019-2022 Espressif Systems (Shanghai) CO LTD
-// Licensed under the Apache License, Version 2.0 (the "License");
+ *
-// you may not use this file except in compliance with the License.
+ * SPDX-License-Identifier: Apache-2.0
-// You may obtain a copy of the License at
+ */
-
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
 
 #ifndef __ESP_WPA_H__
 #define __ESP_WPA_H__
@@ -42,9 +34,10 @@ extern "C" {
   * @{
   */
 /* Crypto callback functions */
-const wpa_crypto_funcs_t g_wifi_default_wpa_crypto_funcs;
+extern const wpa_crypto_funcs_t g_wifi_default_wpa_crypto_funcs; // NOLINT(readability-redundant-declaration)
+
 /* Mesh crypto callback functions */
-const mesh_crypto_funcs_t g_wifi_default_mesh_crypto_funcs;
+extern const mesh_crypto_funcs_t g_wifi_default_mesh_crypto_funcs;
 
 /**
   * @brief     Supplicant initialization

components/wpa_supplicant/src/drivers/driver.h

@@ -173,7 +173,7 @@ struct scan_info {
 	int nl_scan_event;
 	u64 scan_start_tsf;
 	u8 scan_start_tsf_bssid[ETH_ALEN];
-} scan_info;
+};
 
 struct wpa_bss_trans_info {
 	u8 mbo_transition_reason;

components/wpa_supplicant/src/eap_peer/eap.c

@@ -42,6 +42,27 @@
 
 #include "supplicant_opt.h"
 
+u8 *g_wpa_anonymous_identity;
+int g_wpa_anonymous_identity_len;
+u8 *g_wpa_username;
+int g_wpa_username_len;
+const u8 *g_wpa_client_cert;
+int g_wpa_client_cert_len;
+const u8 *g_wpa_private_key;
+int g_wpa_private_key_len;
+const u8 *g_wpa_private_key_passwd;
+int g_wpa_private_key_passwd_len;
+const u8 *g_wpa_ca_cert;
+int g_wpa_ca_cert_len;
+u8 *g_wpa_password;
+int g_wpa_password_len;
+u8 *g_wpa_new_password;
+int g_wpa_new_password_len;
+char *g_wpa_ttls_phase2_type;
+char *g_wpa_phase1_options;
+u8 *g_wpa_pac_file;
+int g_wpa_pac_file_len;
+bool g_wpa_suiteb_certification;
 
 void eap_peer_config_deinit(struct eap_sm *sm);
 void eap_peer_blob_deinit(struct eap_sm *sm);

components/wpa_supplicant/src/eap_peer/eap.h

@@ -19,33 +19,33 @@ struct eap_method_type {
 	EapType method;
 };
 
-u8 *g_wpa_anonymous_identity;
+extern u8 *g_wpa_anonymous_identity;
-int g_wpa_anonymous_identity_len;
+extern int g_wpa_anonymous_identity_len;
-u8 *g_wpa_username;
+extern u8 *g_wpa_username;
-int g_wpa_username_len;
+extern int g_wpa_username_len;
-const u8 *g_wpa_client_cert;
+extern const u8 *g_wpa_client_cert;
-int g_wpa_client_cert_len;
+extern int g_wpa_client_cert_len;
-const u8 *g_wpa_private_key;
+extern const u8 *g_wpa_private_key;
-int g_wpa_private_key_len;
+extern int g_wpa_private_key_len;
-const u8 *g_wpa_private_key_passwd;
+extern const u8 *g_wpa_private_key_passwd;
-int g_wpa_private_key_passwd_len;
+extern int g_wpa_private_key_passwd_len;
 
-const u8 *g_wpa_ca_cert;
+extern const u8 *g_wpa_ca_cert;
-int g_wpa_ca_cert_len;
+extern int g_wpa_ca_cert_len;
 
-u8 *g_wpa_password;
+extern u8 *g_wpa_password;
-int g_wpa_password_len;
+extern int g_wpa_password_len;
 
-u8 *g_wpa_new_password;
+extern u8 *g_wpa_new_password;
-int g_wpa_new_password_len;
+extern int g_wpa_new_password_len;
 
-char *g_wpa_ttls_phase2_type;
+extern char *g_wpa_ttls_phase2_type;
-char *g_wpa_phase1_options;
+extern char *g_wpa_phase1_options;
 
-u8 *g_wpa_pac_file;
+extern u8 *g_wpa_pac_file;
-int g_wpa_pac_file_len;
+extern int g_wpa_pac_file_len;
 
-bool g_wpa_suiteb_certification;
+extern bool g_wpa_suiteb_certification;
 
 const u8 * eap_get_eapKeyData(struct eap_sm *sm, size_t *len);
 void eap_deinit_prev_method(struct eap_sm *sm, const char *txt);

tools/ci/check_copyright_ignore.txt

@@ -2120,7 +2120,6 @@ components/wifi_provisioning/src/wifi_provisioning_priv.h
 components/wifi_provisioning/src/wifi_scan.c
 components/wpa_supplicant/esp_supplicant/include/esp_dpp.h
 components/wpa_supplicant/esp_supplicant/include/esp_rrm.h
-components/wpa_supplicant/esp_supplicant/include/esp_wpa.h
 components/wpa_supplicant/esp_supplicant/include/esp_wps.h
 components/wpa_supplicant/esp_supplicant/src/esp_dpp_i.h
 components/wpa_supplicant/esp_supplicant/src/esp_scan_i.h