in lib: * addext.c, backupfile.c, fsusage.c, human.c, pathmax.h, rpmatch.c, userspec.c, xreadlink.c, xstrtol.c: Include <limits.h> without checking for HAVE_LIMITS_H. * backupfile.c, fsusage.c, hash.c, human.c, safe-read.c, userspec.c, xstrtol.c (CHAR_BIT) : Don't define, since <limits.h> is guaranteed to do that. * fatal.c: Include <stdarg.h> without checking for __STDC__. * exclude.c: Include <stdbool.h> unconditionally. * tempname.c: Include <stddef.h> unconditionally. * hash.c: Include <limits.h>, since we no longer define CHAR_BIT. * modechange.c, rpmatch.c (NULL): Don't define, since <stddef.h> does that. * quote.c: Dont include <stddef.h> or <sys/types.h>; not needed. * safe-read.c (INT_MAX): Don't define, since <limits.h> does that. * safe-read.c (TYPE_MINIMUM, TYPE_MAXIMUM): Remove; no longer needed. * xstrtol.c: Likewise. * safe-read.c: Remove TYPE_SIGNED; no longer needed. * savedir.c: Include <stddef.h> instead of defining NULL. in m4: * backupfile.m4 (gl_BACKUPFILE): Don't check for limits.h. * fsusage.m4 (gl_PREREQ_FSUSAGE_EXTRA): Likewise. * human.m4 (gl_HUMAN): Likewise. * pathmax.m4 (gl_PATHMAX): Likewise. * rpmatch.m4 (gl_FUNC_RPMATCH): Likewise. * userspec.m4 (gl_USERSPEC): Likewise. * xreadlink.m4 (gl_XREADLINK): Likewise. * m4/xstrtol.m4 (gl_PREREQ_XSTRTOL): Likewise. * quote.m4 (gl_QUOTE): Don't check for stddef.h.

--- a/lib/hash.c
+++ b/lib/hash.c
@@ -31,6 +31,7 @@
 # include <stdlib.h>
 #endif
 
+#include <limits.h>
 #include <stdbool.h>
 #include <stdio.h>
 
@@ -403,9 +404,6 @@
 unsigned
 hash_string (const char *string, unsigned n_buckets)
 {
-# ifndef CHAR_BIT
-#  define CHAR_BIT 8
-# endif
 # define ROTATE_LEFT(Value, Shift) \
   ((Value) << (Shift) | (Value) >> ((sizeof (unsigned) * CHAR_BIT) - (Shift)))
 # define HASH_ONE_CHAR(Value, Byte) \