Reduced the size of sigsets to the minimal needed. Apart from the size,

it has the added advantage of giving the C++ build of m68k-elf-gcc a clean
bill of health.

libc/sysdeps/linux/m68k/bits/setjmp.h

@@ -22,6 +22,8 @@
 # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
 #endif
 
+#include <signal.h>
+
 typedef struct
   {
     /* There are eight 4-byte data registers, but D0 is not saved.  */

libc/sysdeps/linux/m68k/bits/sigset.h

@@ -24,11 +24,7 @@ typedef int __sig_atomic_t;
 
 /* A `sigset_t' has a bit for each signal.  */
 
-# define _SIGSET_NWORDS	(1024 / (8 * sizeof (unsigned long int)))
-typedef struct
-  {
-    unsigned long int __val[_SIGSET_NWORDS];
-  } __sigset_t;
+typedef unsigned long __sigset_t;
 
 #endif
 
@@ -47,79 +43,27 @@ typedef struct
 # endif
 
 /* Return a mask that includes the bit for SIG only.  */
-# define __sigmask(sig) \
-  (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
-
-/* Return the word index for SIG.  */
-# define __sigword(sig)	(((sig) - 1) / (8 * sizeof (unsigned long int)))
+# define __sigmask(sig) (1L << ((sig) - 1))
 
 # if defined __GNUC__ && __GNUC__ >= 2
-#  define __sigemptyset(set) \
-  (__extension__ ({ int __cnt = _SIGSET_NWORDS;				      \
-		    sigset_t *__set = (set);				      \
-		    while (--__cnt >= 0) __set->__val[__cnt] = 0;	      \
-		    0; }))
-#  define __sigfillset(set) \
-  (__extension__ ({ int __cnt = _SIGSET_NWORDS;				      \
-		    sigset_t *__set = (set);				      \
-		    while (--__cnt >= 0) __set->__val[__cnt] = ~0UL;	      \
-		    0; }))
+#  define __sigemptyset(set) (*(set) = 0)
+#  define __sigfillset(set) (*(set) = ~0)
 
 #  ifdef __USE_GNU
 /* The POSIX does not specify for handling the whole signal set in one
    command.  This is often wanted and so we define three more functions
    here.  */
-#   define __sigisemptyset(set) \
-  (__extension__ ({ int __cnt = _SIGSET_NWORDS;				      \
-		    const sigset_t *__set = (set);			      \
-		    int __ret = __set->__val[--__cnt];			      \
-		    while (!__ret && --__cnt >= 0)			      \
-			__ret = __set->__val[__cnt];			      \
-		    __ret == 0; }))
-#   define __sigandset(dest, left, right) \
-  (__extension__ ({ int __cnt = _SIGSET_NWORDS;				      \
-		    sigset_t *__dest = (dest);				      \
-		    const sigset_t *__left = (left);			      \
-		    const sigset_t *__right = (right);			      \
-		    while (--__cnt >= 0)				      \
-		      __dest->__val[__cnt] = (__left->__val[__cnt]	      \
-					      & __right->__val[__cnt]);	      \
-		    0; }))
-#   define __sigorset(dest, left, right) \
-  (__extension__ ({ int __cnt = _SIGSET_NWORDS;				      \
-		    sigset_t *__dest = (dest);				      \
-		    const sigset_t *__left = (left);			      \
-		    const sigset_t *__right = (right);			      \
-		    while (--__cnt >= 0)				      \
-		      __dest->__val[__cnt] = (__left->__val[__cnt]	      \
-					      | __right->__val[__cnt]);	      \
-		    0; }))
+#   define __sigisemptyset(set) (*(set) == 0)
+#   define __sigandset(dest, left, right) (*(dest) = *(left) & *(right))
+#   define __sigorset(dest, left, right) (*(dest) = *(left) | *(right))
 #  endif
 # endif
 
 /* These functions needn't check for a bogus signal number -- error
    checking is done in the non __ versions.  */
 
-extern int __sigismember (__const __sigset_t *, int);
-extern int __sigaddset (__sigset_t *, int);
-extern int __sigdelset (__sigset_t *, int);
-
-# ifdef __USE_EXTERN_INLINES
-#  define __SIGSETFN(NAME, BODY, CONST)					      \
-  _EXTERN_INLINE int							      \
-  NAME (CONST __sigset_t *__set, int __sig)				      \
-  {									      \
-    unsigned long int __mask = __sigmask (__sig);			      \
-    unsigned long int __word = __sigword (__sig);			      \
-    return BODY;							      \
-  }
-
-__SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
-__SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
-__SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
-
-#  undef __SIGSETFN
-# endif
-
+# define __sigismember(set, sig) (*(set) & (1L << ((sig)-1)))
+# define __sigaddset(set, sig) (*(set) |= (1L << ((sig)-1)))
+# define __sigdelset(set, sig) (*(set) &= ~(1L << ((sig)-1)))
 
 #endif /* ! _SIGSET_H_fns.  */