git: e97468063d6f - main - Mark usage function as __dead2 in programs where it does not return

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=e97468063d6f9274b885739a9bcb5be7fffc9598

commit e97468063d6f9274b885739a9bcb5be7fffc9598
Author:     Alfonso Gregory <gfunni234@gmail.com>
AuthorDate: 2023-07-07 16:39:23 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-07-07 16:45:17 +0000

    Mark usage function as __dead2 in programs where it does not return
    
    In most cases, usage does not return, so mark them as __dead2. For the
    cases where they do return, they have not been marked __dead2.
    
    Reviewed by: imp
    Pull Request: https://github.com/freebsd/freebsd-src/pull/735
---
 bin/chflags/chflags.c       | 2 +-
 bin/chio/chio.c             | 2 +-
 bin/chmod/chmod.c           | 2 +-
 bin/cp/extern.h             | 2 +-
 bin/date/date.c             | 4 ++--
 bin/domainname/domainname.c | 2 +-
 bin/kill/kill.c             | 2 +-
 bin/rmdir/rmdir.c           | 2 +-
 bin/sleep/sleep.c           | 2 +-
 9 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/bin/chflags/chflags.c b/bin/chflags/chflags.c
index 55dedfce53f1..5c45085624a1 100644
--- a/bin/chflags/chflags.c
+++ b/bin/chflags/chflags.c
@@ -59,7 +59,7 @@ __FBSDID("$FreeBSD$");
 
 static volatile sig_atomic_t siginfo;
 
-static void usage(void);
+static void usage(void) __dead2;
 
 static void
 siginfo_handler(int sig __unused)
diff --git a/bin/chio/chio.c b/bin/chio/chio.c
index da9e4696588b..2a7ce706afd7 100644
--- a/bin/chio/chio.c
+++ b/bin/chio/chio.c
@@ -60,7 +60,7 @@ __FBSDID("$FreeBSD$");
 #include "defs.h"
 #include "pathnames.h"
 
-static	void usage(void);
+static	void usage(void) __dead2;
 static	void cleanup(void);
 static	u_int16_t parse_element_type(char *);
 static	u_int16_t parse_element_unit(char *);
diff --git a/bin/chmod/chmod.c b/bin/chmod/chmod.c
index e8657af0d97b..cd02c4fa810d 100644
--- a/bin/chmod/chmod.c
+++ b/bin/chmod/chmod.c
@@ -59,7 +59,7 @@ __FBSDID("$FreeBSD$");
 
 static volatile sig_atomic_t siginfo;
 
-static void usage(void);
+static void usage(void) __dead2;
 static int may_have_nfs4acl(const FTSENT *ent, int hflag);
 
 static void
diff --git a/bin/cp/extern.h b/bin/cp/extern.h
index 65360ccaf6c1..f42315f07390 100644
--- a/bin/cp/extern.h
+++ b/bin/cp/extern.h
@@ -50,5 +50,5 @@ int	copy_special(struct stat *, int);
 int	setfile(struct stat *, int);
 int	preserve_dir_acls(struct stat *, char *, char *);
 int	preserve_fd_acls(int, int);
-void	usage(void);
+void	usage(void) __dead2;
 __END_DECLS
diff --git a/bin/date/date.c b/bin/date/date.c
index c1fb496ce7ee..b7841030864c 100644
--- a/bin/date/date.c
+++ b/bin/date/date.c
@@ -68,12 +68,12 @@ __FBSDID("$FreeBSD$");
 static time_t tval;
 
 static void badformat(void);
-static void iso8601_usage(const char *);
+static void iso8601_usage(const char *) __dead2;
 static void multipleformats(void);
 static void printdate(const char *);
 static void printisodate(struct tm *);
 static void setthetime(const char *, const char *, int);
-static void usage(void);
+static void usage(void) __dead2;
 
 static const struct iso8601_fmt {
 	const char *refname;
diff --git a/bin/domainname/domainname.c b/bin/domainname/domainname.c
index cd14778221c3..cb42990315b6 100644
--- a/bin/domainname/domainname.c
+++ b/bin/domainname/domainname.c
@@ -51,7 +51,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <unistd.h>
 
-static void usage(void);
+static void usage(void) __dead2;
 
 int
 main(int argc, char *argv[])
diff --git a/bin/kill/kill.c b/bin/kill/kill.c
index 201ab9aaf3e9..4ff7a8b19f9f 100644
--- a/bin/kill/kill.c
+++ b/bin/kill/kill.c
@@ -63,7 +63,7 @@ __FBSDID("$FreeBSD$");
 static void nosig(const char *);
 static void printsignals(FILE *);
 static int signame_to_signum(const char *);
-static void usage(void);
+static void usage(void) __dead2;
 
 int
 main(int argc, char *argv[])
diff --git a/bin/rmdir/rmdir.c b/bin/rmdir/rmdir.c
index 22f1141e14ec..6f1545e40217 100644
--- a/bin/rmdir/rmdir.c
+++ b/bin/rmdir/rmdir.c
@@ -50,7 +50,7 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 
 static int rm_path(char *);
-static void usage(void);
+static void usage(void) __dead2;
 
 static int pflag;
 static int vflag;
diff --git a/bin/sleep/sleep.c b/bin/sleep/sleep.c
index 55e0aba9871a..5c9e7b17b9d9 100644
--- a/bin/sleep/sleep.c
+++ b/bin/sleep/sleep.c
@@ -50,7 +50,7 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <time.h>
 
-static void usage(void);
+static void usage(void) __dead2;
 
 static volatile sig_atomic_t report_requested;
 static void