configure: Add -Wstrict-prototypes and -Wold-style-definition

These are not covered by -Wall (nor -Wextra) but we want
to enforce them.

Change-Id: I6e08920e4cf4762b9f14a7461a29fa77df15255c
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20240620133703.13906-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg28820.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

configure.ac

@@ -1408,6 +1408,8 @@ AC_DEFUN([ACL_CHECK_ADD_COMPILE_FLAGS], [
 )
 
 ACL_CHECK_ADD_COMPILE_FLAGS([-Wno-stringop-truncation])
+ACL_CHECK_ADD_COMPILE_FLAGS([-Wstrict-prototypes])
+ACL_CHECK_ADD_COMPILE_FLAGS([-Wold-style-definition])
 ACL_CHECK_ADD_COMPILE_FLAGS([-Wall])
 
 if test "${enable_pedantic}" = "yes"; then

src/openvpn/dco.h

@@ -247,7 +247,7 @@ int dco_get_peer_stats(struct context *c);
  *
  * @return                   list of colon-separated ciphers
  */
-const char *dco_get_supported_ciphers();
+const char *dco_get_supported_ciphers(void);
 
 #else /* if defined(ENABLE_DCO) */
 
@@ -375,7 +375,7 @@ dco_get_peer_stats(struct context *c)
 }
 
 static inline const char *
-dco_get_supported_ciphers()
+dco_get_supported_ciphers(void)
 {
     return "";
 }

src/openvpn/dco_freebsd.c

@@ -773,7 +773,7 @@ dco_get_peer_stats(struct context *c)
 }
 
 const char *
-dco_get_supported_ciphers()
+dco_get_supported_ciphers(void)
 {
     return "none:AES-256-GCM:AES-192-GCM:AES-128-GCM:CHACHA20-POLY1305";
 }

src/openvpn/dco_linux.c

@@ -1053,7 +1053,7 @@ dco_event_set(dco_context_t *dco, struct event_set *es, void *arg)
 }
 
 const char *
-dco_get_supported_ciphers()
+dco_get_supported_ciphers(void)
 {
     return "AES-128-GCM:AES-256-GCM:AES-192-GCM:CHACHA20-POLY1305";
 }

src/openvpn/sig.c

@@ -448,7 +448,7 @@ post_init_signal_catch(void)
 }
 
 void
-halt_low_priority_signals()
+halt_low_priority_signals(void)
 {
 #ifndef _WIN32
     struct sigaction sa;

src/openvpn/ssl.c

@@ -277,7 +277,7 @@ static char *auth_challenge; /* GLOBAL */
 #endif
 
 void
-enable_auth_user_pass()
+enable_auth_user_pass(void)
 {
     auth_user_pass_enabled = true;
 }

src/openvpn/ssl.h

@@ -381,7 +381,7 @@ void tls_post_encrypt(struct tls_multi *multi, struct buffer *buf);
 void pem_password_setup(const char *auth_file);
 
 /* Enables the use of user/password authentication */
-void enable_auth_user_pass();
+void enable_auth_user_pass(void);
 
 /*
  * Setup authentication username and password. If auth_file is given, use the

src/openvpn/xkey_helper.c

@@ -49,7 +49,7 @@ static const char *const props = XKEY_PROV_PROPS;
 XKEY_EXTERNAL_SIGN_fn xkey_management_sign;
 
 static void
-print_openssl_errors()
+print_openssl_errors(void)
 {
     unsigned long e;
     while ((e = ERR_get_error()))

src/openvpn/xkey_provider.c

@@ -155,7 +155,7 @@ static int
 keymgmt_import_helper(XKEY_KEYDATA *key, const OSSL_PARAM params[]);
 
 static XKEY_KEYDATA *
-keydata_new()
+keydata_new(void)
 {
     xkey_dmsg(D_XKEY, "entry");
 

tests/unit_tests/openvpn/test_common.h

@@ -33,7 +33,7 @@
  * methods
  */
 static inline void
-openvpn_unit_test_setup()
+openvpn_unit_test_setup(void)
 {
     assert_int_equal(setvbuf(stdout, NULL, _IONBF, BUFSIZ), 0);
     assert_int_equal(setvbuf(stderr, NULL, _IONBF, BUFSIZ), 0);

tests/unit_tests/openvpn/test_provider.c

@@ -119,7 +119,7 @@ load_pubkey(const char *pem)
 }
 
 static void
-init_test()
+init_test(void)
 {
     openvpn_unit_test_setup();
     prov[0] = OSSL_PROVIDER_load(NULL, "default");
@@ -135,7 +135,7 @@ init_test()
 }
 
 static void
-uninit_test()
+uninit_test(void)
 {
     for (size_t i = 0; i < _countof(prov); i++)
     {

tests/unit_tests/openvpn/test_ssl.c

@@ -81,7 +81,7 @@ const char *unittest_cert = "-----BEGIN CERTIFICATE-----\n"
                             "-----END CERTIFICATE-----\n";
 
 static const char *
-get_tmp_dir()
+get_tmp_dir(void)
 {
     const char *ret;
 #ifdef _WIN32

tests/unit_tests/plugins/auth-pam/test_search_and_replace.c

@@ -9,7 +9,7 @@
 #include "utils.h"
 
 static void
-pass_any_null_param__returns_null()
+pass_any_null_param__returns_null(void **state)
 {
 
     char DUMMY[] = "DUMMY";
@@ -20,7 +20,7 @@ pass_any_null_param__returns_null()
 }
 
 static void
-pass_any_empty_string__returns_null()
+pass_any_empty_string__returns_null(void **state)
 {
 
     char DUMMY[] = "DUMMY";
@@ -32,7 +32,7 @@ pass_any_empty_string__returns_null()
 }
 
 static void
-replace_single_char__one_time__match_is_replaced()
+replace_single_char__one_time__match_is_replaced(void **state)
 {
     char *replaced = searchandreplace("X", "X", "Y");
 
@@ -43,7 +43,7 @@ replace_single_char__one_time__match_is_replaced()
 }
 
 static void
-replace_single_char__multiple_times__match_all_matches_are_replaced()
+replace_single_char__multiple_times__match_all_matches_are_replaced(void **state)
 {
     char *replaced = searchandreplace("XaX", "X", "Y");
 
@@ -54,7 +54,7 @@ replace_single_char__multiple_times__match_all_matches_are_replaced()
 }
 
 static void
-replace_longer_text__multiple_times__match_all_matches_are_replaced()
+replace_longer_text__multiple_times__match_all_matches_are_replaced(void **state)
 {
     char *replaced = searchandreplace("XXaXX", "XX", "YY");
 
@@ -65,7 +65,7 @@ replace_longer_text__multiple_times__match_all_matches_are_replaced()
 }
 
 static void
-pattern_not_found__returns_original()
+pattern_not_found__returns_original(void **state)
 {
     char *replaced = searchandreplace("abc", "X", "Y");