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Replace __attribute__((__noreturn__)) with _Noreturn. (#77)

* Replace __attribute__((__noreturn__)) with _Noreturn.

* Change _Noreturn to noreturn and #include <stdnoreturn.h>

--- a/awk.h

+++ b/awk.h

@@ -25,6 +25,7 @@

 #include <assert.h>

 #include <stdint.h>

 #include <stdbool.h>

+#include <stdnoreturn.h>

 typedef double	Awkfloat;

--- a/main.c

+++ b/main.c

@@ -52,7 +52,7 @@

 bool	safe = false;	/* true => "safe" mode */

-static __attribute__((__noreturn__)) void fpecatch(int n

+static noreturn void fpecatch(int n

 #ifdef SA_SIGINFO

 	, siginfo_t *si, void *uc

 #endif

--- a/proto.h

+++ b/proto.h

@@ -46,7 +46,7 @@

 extern	int	hexstr(const uschar **);

 extern	int	quoted(const uschar **);

 extern	char	*cclenter(const char *);

-extern	void	overflo(const char *) __attribute__((__noreturn__));

+extern	noreturn void	overflo(const char *);

 extern	void	cfoll(fa *, Node *);

 extern	int	first(Node *);

 extern	void	follow(Node *);

@@ -137,8 +137,8 @@

 extern	void	bcheck2(int, int, int);

 extern	void	SYNTAX(const char *, ...)

     __attribute__((__format__(__printf__, 1, 2)));

-extern	void	FATAL(const char *, ...)

-    __attribute__((__format__(__printf__, 1, 2), __noreturn__));

+extern	noreturn void	FATAL(const char *, ...)

+    __attribute__((__format__(__printf__, 1, 2)));

 extern	void	WARNING(const char *, ...)

     __attribute__((__format__(__printf__, 1, 2)));

 extern	void	error(void);

-- 

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