Fix build failure on hosts with gcc 10

We cannot just uname these unused parameters because gcc 10
need them. There will be error like below with gcc 10:

  lib/copydir.c:103:11: error: parameter name omitted

The Debian bullseye uses gcc 10 by default.

Most of the changes are done manually. Some changes in tests/unit
are done via the following shell command:
sed -i -e 's#void \*\*#MAYBE_UNUSED void \*\* _1#g'  tests/unit/test_*.c

Closes: <#1530>
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Cherry-picked-from: cb0ec03 (2026-03-02; "Fix build failure on hosts with gcc 10")
Signed-off-by: Alejandro Colomar <alx@kernel.org>

Author: ChenQi1989

lib/copydir.c

@@ -100,7 +100,7 @@ static int fchown_if_needed (int fdst, const struct stat *statp,
  */
 format_attr(printf, 2, 3)
 static void
-error_acl(struct error_context *, const char *fmt, ...)
+error_acl(MAYBE_UNUSED struct error_context *_1, const char *fmt, ...)
 {
 	va_list ap;
 	FILE *shadow_logfd = log_get_logfd();

lib/loginprompt.c

@@ -27,7 +27,7 @@
 
 
 static void
-login_exit(int)
+login_exit(MAYBE_UNUSED int _1)
 {
 	_exit (EXIT_FAILURE);
 }

lib/pam_pass_non_interactive.c

@@ -27,7 +27,7 @@
 static int ni_conv (int num_msg,
                     const struct pam_message **msg,
                     struct pam_response **resp,
-                    void *);
+                    MAYBE_UNUSED void *_1);
 static const struct pam_conv non_interactive_pam_conv = {
 	ni_conv,
 	NULL
@@ -38,7 +38,7 @@ static const struct pam_conv non_interactive_pam_conv = {
 static int ni_conv (int num_msg,
                     const struct pam_message **msg,
                     struct pam_response **resp,
-                    void *)
+                    MAYBE_UNUSED void *_1)
 {
 	struct pam_response *responses;
 	int count;

lib/semanage.c

@@ -28,7 +28,7 @@
 
 
 format_attr(printf, 3, 4)
-static void semanage_error_callback (void *,
+static void semanage_error_callback(MAYBE_UNUSED void *_1,
                                      semanage_handle_t *handle,
                                      const char *fmt, ...)
 {

lib/sssd.h

@@ -1,6 +1,8 @@
 #ifndef _SSSD_H_
 #define _SSSD_H_
 
+#include "attr.h"
+
 #define SSSD_DB_PASSWD	0x001
 #define SSSD_DB_GROUP	0x002
 
@@ -11,7 +13,7 @@
 extern int sssd_flush_cache (int dbflags);
 #else
 static inline int
-sssd_flush_cache(int)
+sssd_flush_cache(MAYBE_UNUSED int _1)
 {
 	return 0;
 }

src/chsh.c

@@ -198,7 +198,7 @@ static bool shell_is_listed (const char *sh, bool process_selinux)
 
 #else /* without HAVE_VENDORDIR */
 
-static bool shell_is_listed (const char *sh, bool)
+static bool shell_is_listed (const char *sh, MAYBE_UNUSED bool _1)
 {
 	bool found = false;
 	char *cp;

src/gpasswd.c

@@ -109,14 +109,14 @@ static void update_group (struct group *gr);
 static void change_passwd (struct group *gr);
 #endif
 static void log_gpasswd_failure (const char *suffix);
-static void log_gpasswd_failure_system (/*@null@*/void *);
-static void log_gpasswd_failure_group (/*@null@*/void *);
+static void log_gpasswd_failure_system (/*@null@*/MAYBE_UNUSED void *_1);
+static void log_gpasswd_failure_group (/*@null@*/MAYBE_UNUSED void *_1);
 #ifdef SHADOWGRP
-static void log_gpasswd_failure_gshadow (/*@null@*/void *);
+static void log_gpasswd_failure_gshadow (/*@null@*/MAYBE_UNUSED void *_1);
 #endif
 static void log_gpasswd_success (const char *suffix);
-static void log_gpasswd_success_system (/*@null@*/void *);
-static void log_gpasswd_success_group(/*@null@*/void *);
+static void log_gpasswd_success_system (/*@null@*/MAYBE_UNUSED void *_1);
+static void log_gpasswd_success_group (/*@null@*/MAYBE_UNUSED void *_1);
 
 /*
  * usage - display usage message
@@ -472,13 +472,13 @@ static void log_gpasswd_failure (const char *suffix)
 }
 
 static void
-log_gpasswd_failure_system(void *)
+log_gpasswd_failure_system(MAYBE_UNUSED void *_1)
 {
 	log_gpasswd_failure ("");
 }
 
 static void
-log_gpasswd_failure_group(void *)
+log_gpasswd_failure_group(MAYBE_UNUSED void *_1)
 {
 	char  buf[1024];
 
@@ -488,7 +488,7 @@ log_gpasswd_failure_group(void *)
 
 #ifdef SHADOWGRP
 static void
-log_gpasswd_failure_gshadow(void *)
+log_gpasswd_failure_gshadow(MAYBE_UNUSED void *_1)
 {
 	char  buf[1024];
 
@@ -586,13 +586,13 @@ static void log_gpasswd_success (const char *suffix)
 }
 
 static void
-log_gpasswd_success_system(void *)
+log_gpasswd_success_system(MAYBE_UNUSED void *_1)
 {
 	log_gpasswd_success ("");
 }
 
 static void
-log_gpasswd_success_group(void *)
+log_gpasswd_success_group(MAYBE_UNUSED void *_1)
 {
 	char  buf[1024];
 

src/grpconv.c

@@ -277,7 +277,7 @@ int main (int argc, char **argv)
 }
 #else				/* !SHADOWGRP */
 int
-main(int, char **argv)
+main(MAYBE_UNUSED int _1, char **argv)
 {
 	fprintf (stderr,
 		 "%s: not configured for shadow group support.\n", argv[0]);

src/grpunconv.c

@@ -239,7 +239,7 @@ int main (int argc, char **argv)
 }
 #else				/* !SHADOWGRP */
 int
-main(int, char **argv)
+main(MAYBE_UNUSED int _1, char **argv)
 {
 	fprintf (stderr,
 		 "%s: not configured for shadow group support.\n", argv[0]);

src/login.c

@@ -367,13 +367,13 @@ static void init_env (void)
 }
 
 static void
-exit_handler(int)
+exit_handler(MAYBE_UNUSED int _1)
 {
 	_exit (0);
 }
 
 static void
-alarm_handler(int)
+alarm_handler(MAYBE_UNUSED int _1)
 {
 	write_full(STDERR_FILENO, tmsg, strlen(tmsg));
 	signal(SIGALRM, exit_handler);