more ATTNORETURN

A recent commit to alloc.c by Keni drew attention to the fact that
there are extern prototypes scattered around in various .c files.
Those can make use of ATTRNORETURN (non-gcc compilers and C23) the
same way the prototypes in extern.h can, and they were overlooked
when ATTRNORETURN was first added.

util/dlb_main.c

@@ -14,8 +14,8 @@
 #include <string.h>
 #endif
 
-static void xexit(int) NORETURN;
-extern void panic(const char *, ...) NORETURN;
+ATTRNORETURN static void xexit(int) NORETURN;
+ATTRNORETURN extern void panic(const char *, ...) NORETURN;
 char *eos(char *); /* also used by dlb.c */
 FILE *fopen_datafile(const char *, const char *);
 unsigned FITSuint_(unsigned long long, const char *, int);
@@ -33,8 +33,8 @@ extern boolean open_library(const char *, library *);
 extern void close_library(library *);
 
 static void Write(int, char *, long);
-static void usage(void) NORETURN;
-static void verbose_help(void) NORETURN;
+ATTRNORETURN static void usage(void) NORETURN;
+ATTRNORETURN static void verbose_help(void) NORETURN;
 static void write_dlb_directory(int, int, libdir *, long, long, long);
 
 static char default_progname[] = "dlb";
@@ -78,7 +78,7 @@ static char origdir[255] = "";
  *  C dir	chdir to dir (used ONCE, not like tar's -C)
  */
 
-static void
+ATTRNORETURN static void
 usage(void)
 {
     (void) printf("Usage: %s [ctxCIfv] arguments... [files...]\n", progname);
@@ -88,7 +88,7 @@ usage(void)
     /*NOTREACHED*/
 }
 
-static void
+ATTRNORETURN static void
 verbose_help(void)
 {
     static const char *const long_help[] = {
@@ -537,7 +537,7 @@ write_dlb_directory(int out, int nfiles, libdir *ld,
 #endif /* DLBLIB */
 #endif /* DLB */
 
-static void
+ATTRNORETURN static void
 xexit(int retcd)
 {
 #ifdef DLB

util/makedefs.c

@@ -179,9 +179,9 @@ unsigned FITSuint_(unsigned long long, const char *, int);
 
 #include "../src/mdlib.c"
 
-static void makedefs_exit(int) NORETURN;
+ATTRNORETURN static void makedefs_exit(int) NORETURN;
 
-static void
+ATTRNORETURN static void
 makedefs_exit(int how)
 {
 #if 0   /* makedefs doesn't need to do this */