MiNT 1.10: update for gcc 2.5, function never returns

[Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>]

This patch updates the sources to use the new way of gcc to declare
that a function never returns, by adding `__attribute__((noreturn))'
to the declaration.

diff -ur orig/debug.c ./debug.c
--- orig/debug.c	Mon Sep 27 22:35:48 1993
+++ ./debug.c	Sat Feb 19 12:06:02 1994
@@ -535,7 +535,7 @@
 	int scan;
 	extern long tosssp;	/* in main.c */
 #ifdef PROFILING
-	extern EXITING _exit P_((int));
+	extern EXITING _exit P_((int)) NORETURN;
 #endif
 	restr_intr();	/* restore interrupts to normal */
 #ifdef DEBUG_INFO
diff -ur orig/file.h ./file.h
--- orig/file.h	Tue Feb 15 23:21:30 1994
+++ ./file.h	Thu Feb 17 21:14:30 1994
@@ -208,7 +208,7 @@
 	void	ARGS_ON_STACK (*trace) P_((const char *, ...));
 	void	ARGS_ON_STACK (*debug) P_((const char *, ...));
 	void	ARGS_ON_STACK (*alert) P_((const char *, ...));
-	EXITING void ARGS_ON_STACK (*fatal) P_((const char *, ...));
+	EXITING void ARGS_ON_STACK (*fatal) P_((const char *, ...)) NORETURN;
 
 /* memory allocation functions */
 	void *	ARGS_ON_STACK (*kmalloc) P_((long));
diff -ur orig/mint.h ./mint.h
--- orig/mint.h	Fri Feb 11 19:38:38 1994
+++ ./mint.h	Thu Feb 17 21:01:48 1994
@@ -59,9 +59,19 @@
  */
 
 #ifdef __GNUC__
-#define EXITING volatile	/* function never returns */
+#if __GNUC__ > 2 || __GNUC_MINOR__ >= 5
+#define NORETURN __attribute__ ((noreturn))	/* function never returns */
 #else
+#define EXITING volatile	/* function never returns */
+#endif
+#endif
+
+#ifndef EXITING
 #define EXITING
+#endif
+
+#ifndef NORETURN
+#define NORETURN
 #endif
 
 #ifdef dLibs
diff -ur orig/proto.h ./proto.h
--- orig/proto.h	Fri Feb 11 19:35:00 1994
+++ ./proto.h	Thu Feb 17 21:21:24 1994
@@ -353,8 +353,8 @@
 void ARGS_ON_STACK ALERT P_((const char *s, ...));
 void ARGS_ON_STACK FORCE P_((const char *s, ...));
 void PAUSE P_((void));
-EXITING void ARGS_ON_STACK FATAL P_((const char *s, ...));
-EXITING void HALT P_((void));
+EXITING void ARGS_ON_STACK FATAL P_((const char *, ...)) NORETURN;
+EXITING void HALT P_((void)) NORETURN;
 void DUMPLOG P_((void));
 void do_func_key P_((int));