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.

6 files changed, 20 insertions, 22 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/scandir64.c b/sysdeps/unix/sysv/linux/arm/scandir64.c
deleted file mode 100644
index 506fd88..0000000
--- a/sysdeps/unix/sysv/linux/arm/scandir64.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/scandir64.c>
diff --git a/sysdeps/unix/sysv/linux/m68k/scandir64.c b/sysdeps/unix/sysv/linux/m68k/scandir64.c
deleted file mode 100644
index 506fd88..0000000
--- a/sysdeps/unix/sysv/linux/m68k/scandir64.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/scandir64.c>
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/scandir64.c b/sysdeps/unix/sysv/linux/powerpc/powerpc32/scandir64.c
deleted file mode 100644
index 506fd88..0000000
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/scandir64.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/scandir64.c>
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/scandir64.c b/sysdeps/unix/sysv/linux/s390/s390-32/scandir64.c
deleted file mode 100644
index 506fd88..0000000
--- a/sysdeps/unix/sysv/linux/s390/s390-32/scandir64.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/scandir64.c>
diff --git a/sysdeps/unix/sysv/linux/i386/scandir64.c b/sysdeps/unix/sysv/linux/scandir64.c
index 50590c3..efb502f 100644
--- a/sysdeps/unix/sysv/linux/i386/scandir64.c
+++ b/sysdeps/unix/sysv/linux/scandir64.c
@@ -15,26 +15,28 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#define scandir __no_scandir_decl
 #include <dirent.h>
+#undef scandir
 
-#define SCANDIR		__scandir64
-#define SCANDIR_TAIL	__scandir64_tail
-#define DIRENT_TYPE	struct dirent64
-
-#include <dirent/scandir.c>
-
-#undef	SCANDIR
-#undef	SCANDIR_TAIL
-#undef	DIRENT_TYPE
-
-#include <shlib-compat.h>
+int
+__scandir64 (const char *dir, struct dirent64 ***namelist,
+	   int (*select) (const struct dirent64 *),
+	   int (*cmp) (const struct dirent64 **, const struct dirent64 **))
+{
+  return __scandir64_tail (__opendir (dir), namelist, select, cmp);
+}
 
+#if _DIRENT_MATCHES_DIRENT64
+weak_alias (__scandir64, scandir64)
+weak_alias (__scandir64, scandir)
+#else
+# include <shlib-compat.h>
 versioned_symbol (libc, __scandir64, scandir64, GLIBC_2_2);
-
-#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
-# include <string.h>
-# include <errno.h>
-# include "olddirent.h"
+# if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
+#  include <string.h>
+#  include <errno.h>
+#  include "olddirent.h"
 
 int
 __old_scandir64 (const char *dir, struct __old_dirent64 ***namelist,
@@ -133,4 +135,5 @@ __old_scandir64 (const char *dir, struct __old_dirent64 ***namelist,
 }
 compat_symbol (libc, __old_scandir64, scandir64, GLIBC_2_1);
 
-#endif
+# endif /* SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)  */
+#endif /* _DIRENT_MATCHES_DIRENT64  */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/scandir64.c b/sysdeps/unix/sysv/linux/sparc/sparc32/scandir64.c
deleted file mode 100644
index 506fd88..0000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/scandir64.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/scandir64.c>