Consolidate scandir{at}{64} implementation

This patch consolidates scandir{at}{64} implementation on just
the default dirent/scandir{at}{64}{_r}.c ones.  It changes the logic
to follow the conventions used on other code consolidation:

  * scandir{at} is only built for _DIRENT_MATCHES_DIRENT64 being 0.

  * scandir{at}{64} is always built and aliased to getdents for ABIs
    that define _DIRENT_MATCHES_DIRENT64 to 1.

Also on Linux the compat symbol for old non-LFS dirent64 definition
requires a platform-specific scandir64.c.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu,
sparcv9-linux-gnu, sparc64-linux-gnu, powerpc-linux-gnu, and
powerpc64le-linux-gnu.

	* dirent/scandir-tail-common.c: New file.
	* dirent/scandir-tail.c: Use scandir-tail-common.c.
	(__scandir_tail): Build iff _DIRENT_MATCHES_DIRENT64 is not defined.
	* dirent/scandir.c: Use scandir-tail-common.c.
	* dirent/scandirat.c: Likewise.
	* dirent/scandir64-tail.c: Use scandir-tail-common.c.
	* dirent/scandir64.c (scandir64): Always build and alias to scandir
	if _DIRENT_MATCHES_DIRENT64 is defined.
	* dirent/scandirat64.c (scandirat64): Likewise.
	* include/dirent.h (__scandir_tail): Only define iff
	_DIRENT_MATCHES_DIRENT64 is not defined.
	(__scandir64_tail): Define regardless.
	(__scandirat, scandirat64): Remove libc_hidden_proto.
	* sysdeps/unix/sysv/linux/arm/scandir64.c: Remove file.
	* sysdeps/unix/sysv/linux/m68k/scandir64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/scandir64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/scandir64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/scandir64.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/scandir64.c: Likewise.
	* sysdeps/unix/sysv/linux/scandir64.c: New file.

1 files changed, 8 insertions, 10 deletions

diff --git a/include/dirent.h b/include/dirent.h
index e533b0b59d..400835eefe 100644
--- a/include/dirent.h
+++ b/include/dirent.h
@@ -58,25 +58,23 @@ extern int __scandir_tail (DIR *dp,
 			   int (*cmp) (const struct dirent **,
 				       const struct dirent **))
   attribute_hidden;
-#  if _DIRENT_MATCHES_DIRENT64
-#   define __scandir64_tail (dp, namelist, select, cmp)         \
-  __scandir_tail (dp, (struct dirent ***) (namelist),           \
-		  (int (*) (const struct dirent *)) (select),   \
-		  (int (*) (const struct dirent **,             \
-			    const struct dirent **)) (cmp))
-#  else
+#  if !_DIRENT_MATCHES_DIRENT64
+extern int __scandir_tail (DIR *dp,
+			   struct dirent ***namelist,
+			   int (*select) (const struct dirent *),
+			   int (*cmp) (const struct dirent **,
+					 const struct dirent **))
+  attribute_hidden;
+#  endif
 extern int __scandir64_tail (DIR *dp,
 			     struct dirent64 ***namelist,
 			     int (*select) (const struct dirent64 *),
 			     int (*cmp) (const struct dirent64 **,
 					 const struct dirent64 **))
   attribute_hidden;
-#  endif
 
 libc_hidden_proto (__rewinddir)
 extern __typeof (scandirat) __scandirat;
-libc_hidden_proto (__scandirat)
-libc_hidden_proto (scandirat64)
 
 #  if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
 extern __typeof (__rewinddir) __rewinddir attribute_hidden;