Always define __USE_TIME_BITS64 when 64 bit time_t is used

It was raised on libc-help [1] that some Linux kernel interfaces expect
the libc to define __USE_TIME_BITS64 to indicate the time_t size for the
kABI.  Different than defined by the initial y2038 design document [2],
the __USE_TIME_BITS64 is only defined for ABIs that support more than
one time_t size (by defining the _TIME_BITS for each module).

The 64 bit time_t redirects are now enabled using a different internal
define (__USE_TIME64_REDIRECTS). There is no expected change in semantic
or code generation.

Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, and
arm-linux-gnueabi

[1] https://sourceware.org/pipermail/libc-help/2024-January/006557.html
[2] https://sourceware.org/glibc/wiki/Y2038ProofnessDesign

Reviewed-by: DJ Delorie <dj@redhat.com>

75 files changed, 178 insertions, 182 deletions

diff --git a/io/bits/poll2.h b/io/bits/poll2.h
index 24ec1056eb..ca9d58badd 100644
--- a/io/bits/poll2.h
+++ b/io/bits/poll2.h
@@ -48,7 +48,7 @@ poll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
 
 
 #ifdef __USE_GNU
-# ifdef __USE_TIME_BITS64
+# ifdef __USE_TIME64_REDIRECTS
 extern int __REDIRECT (__ppoll64_alias, (struct pollfd *__fds, nfds_t __nfds,
 				       const struct timespec *__timeout,
 				       const __sigset_t *__ss), __ppoll64);
diff --git a/io/fcntl.h b/io/fcntl.h
index 38aa12d7f2..f157991782 100644
--- a/io/fcntl.h
+++ b/io/fcntl.h
@@ -172,7 +172,7 @@ typedef __pid_t pid_t;
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
-#ifndef __USE_TIME_BITS64
+#ifndef __USE_TIME64_REDIRECTS
 # ifndef __USE_FILE_OFFSET64
 extern int fcntl (int __fd, int __cmd, ...);
 # else
@@ -185,7 +185,7 @@ extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
 # ifdef __USE_LARGEFILE64
 extern int fcntl64 (int __fd, int __cmd, ...);
 # endif
-#else /* __USE_TIME_BITS64 */
+#else /* __USE_TIME64_REDIRECTS */
 # ifdef __REDIRECT
 extern int __REDIRECT_NTH (fcntl, (int __fd, int __request, ...),
 			   __fcntl_time64);
diff --git a/io/fts.h b/io/fts.h
index 61f95bb441..97a031ebbd 100644
--- a/io/fts.h
+++ b/io/fts.h
@@ -187,7 +187,7 @@ FTSENT	*fts_read (FTS *);
 int	 fts_set (FTS *, FTSENT *, int) __THROW;
 #else
 # ifdef __REDIRECT
-#  ifndef __USE_TIME_BITS64
+#  ifndef __USE_TIME64_REDIRECTS
 FTSENT	*__REDIRECT (fts_children, (FTS *, int), fts64_children);
 int	 __REDIRECT (fts_close, (FTS *), fts64_close);
 FTS	*__REDIRECT (fts_open, (char * const *, int,
@@ -206,7 +206,7 @@ int	 __REDIRECT_NTH (fts_set, (FTS *, FTSENT *, int),
 			 __fts64_set_time64);
 #  endif
 # else
-#  ifndef __USE_TIME_BITS64
+#  ifndef __USE_TIME64_REDIRECTS
 #   define fts_children fts64_children
 #   define fts_close fts64_close
 #   define fts_open fts64_open
@@ -217,7 +217,7 @@ int	 __REDIRECT_NTH (fts_set, (FTS *, FTSENT *, int),
 # endif
 #endif
 #ifdef __USE_LARGEFILE64
-# ifndef __USE_TIME_BITS64
+# ifndef __USE_TIME64_REDIRECTS
 FTSENT64 *fts64_children (FTS64 *, int);
 int	  fts64_close (FTS64 *);
 FTS64	 *fts64_open (char * const *, int,
diff --git a/io/ftw.h b/io/ftw.h
index e4d1b84d53..39cf595b27 100644
--- a/io/ftw.h
+++ b/io/ftw.h
@@ -137,7 +137,7 @@ extern int ftw (const char *__dir, __ftw_func_t __func, int __descriptors)
      __nonnull ((1, 2));
 #else
 # ifdef __REDIRECT
-#  ifndef __USE_TIME_BITS64
+#  ifndef __USE_TIME64_REDIRECTS
 extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
 			     int __descriptors), ftw64) __nonnull ((1, 2));
 #  else
@@ -146,7 +146,7 @@ extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
      __nonnull ((1, 2));
 #  endif
 # else
-#  ifndef __USE_TIME_BITS64
+#  ifndef __USE_TIME64_REDIRECTS
 #   define ftw ftw64
 #  else
 #   define ftw __ftw64_time64
@@ -154,7 +154,7 @@ extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
 # endif
 #endif
 #ifdef __USE_LARGEFILE64
-# ifndef __USE_TIME_BITS64
+# ifndef __USE_TIME64_REDIRECTS
 extern int ftw64 (const char *__dir, __ftw64_func_t __func,
 		  int __descriptors) __nonnull ((1, 2));
 # else
@@ -180,7 +180,7 @@ extern int nftw (const char *__dir, __nftw_func_t __func, int __descriptors,
 		 int __flag) __nonnull ((1, 2));
 # else
 #  ifdef __REDIRECT
-#   ifndef __USE_TIME_BITS64
+#   ifndef __USE_TIME64_REDIRECTS
 extern int __REDIRECT (nftw, (const char *__dir, __nftw_func_t __func,
 			      int __descriptors, int __flag), nftw64)
      __nonnull ((1, 2));
@@ -190,7 +190,7 @@ extern int __REDIRECT (nftw, (const char *__dir, __nftw_func_t __func,
      __nonnull ((1, 2));
 #   endif
 #  else
-#   ifndef __USE_TIME_BITS64
+#   ifndef __USE_TIME64_REDIRECTS
 #    define nftw nftw64
 #   else
 #