commit db07fae8250401adb2b97ab3e53d41da2a6bd767
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Nov 26 16:59:44 2020 +0100

    elf: Introduce enum opt_format in the ldconfig implementation
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

diff --git a/elf/cache.c b/elf/cache.c
index c4cd825c30e00e8e..edcdd4b7cc1a6a0b 100644
--- a/elf/cache.c
+++ b/elf/cache.c
@@ -321,13 +321,13 @@ save_cache (const char *cache_name)
   struct cache_file *file_entries = NULL;
   size_t file_entries_size = 0;
 
-  if (opt_format != 2)
+  if (opt_format != opt_format_new)
     {
       /* struct cache_file_new is 64-bit aligned on some arches while
 	 only 32-bit aligned on other arches.  Duplicate last old
 	 cache entry so that new cache in ld.so.cache can be used by
 	 both.  */
-      if (opt_format != 0)
+      if (opt_format != opt_format_old)
 	cache_entry_old_count = (cache_entry_old_count + 1) & ~1;
 
       /* And the list of all entries in the old format.  */
@@ -345,7 +345,7 @@ save_cache (const char *cache_name)
   struct cache_file_new *file_entries_new = NULL;
   size_t file_entries_new_size = 0;
 
-  if (opt_format != 0)
+  if (opt_format != opt_format_old)
     {
       /* And the list of all entries in the new format.  */
       file_entries_new_size = sizeof (struct cache_file_new)
@@ -370,7 +370,7 @@ save_cache (const char *cache_name)
      table, we have to adjust all string indices for this so that
      old libc5/glibc 2 dynamic linkers just ignore them.  */
   unsigned int str_offset;
-  if (opt_format != 0)
+  if (opt_format != opt_format_old)
     str_offset = file_entries_new_size;
   else
     str_offset = 0;
@@ -385,13 +385,13 @@ save_cache (const char *cache_name)
        entry = entry->next, ++idx_new)
     {
       /* First the library.  */
-      if (opt_format != 2 && entry->hwcap == 0)
+      if (opt_format != opt_format_new && entry->hwcap == 0)
 	{
 	  file_entries->libs[idx_old].flags = entry->flags;
 	  /* XXX: Actually we can optimize here and remove duplicates.  */
 	  file_entries->libs[idx_old].key = str_offset + pad;
 	}
-      if (opt_format != 0)
+      if (opt_format != opt_format_old)
 	{
 	  /* We could subtract file_entries_new_size from str_offset -
 	     not doing so makes the code easier, the string table
@@ -407,9 +407,9 @@ save_cache (const char *cache_name)
       str = mempcpy (str, entry->lib, len);
       str_offset += len;
       /* Then the path.  */
-      if (opt_format != 2 && entry->hwcap == 0)
+      if (opt_format != opt_format_new && entry->hwcap == 0)
 	file_entries->libs[idx_old].value = str_offset + pad;
-      if (opt_format != 0)
+      if (opt_format != opt_format_old)
 	file_entries_new->libs[idx_new].value = str_offset;
       len = strlen (entry->path) + 1;
       str = mempcpy (str, entry->path, len);
@@ -420,7 +420,7 @@ save_cache (const char *cache_name)
     }
 
   /* Duplicate last old cache entry if needed.  */
-  if (opt_format != 2
+  if (opt_format != opt_format_new
       && idx_old < cache_entry_old_count)
     file_entries->libs[idx_old] = file_entries->libs[idx_old - 1];
 
@@ -438,16 +438,16 @@ save_cache (const char *cache_name)
 	   temp_name);
 
   /* Write contents.  */
-  if (opt_format != 2)
+  if (opt_format != opt_format_new)
     {
       if (write (fd, file_entries, file_entries_size)
 	  != (ssize_t) file_entries_size)
 	error (EXIT_FAILURE, errno, _("Writing of cache data failed"));
     }
-  if (opt_format != 0)
+  if (opt_format != opt_format_old)
     {
       /* Align cache.  */
-      if (opt_format != 2)
+      if (opt_format != opt_format_new)
 	{
 	  char zero[pad];
 	  memset (zero, '\0', pad);
diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index be730ceb075f6c1f..0fa5aef83f9cd86c 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -100,8 +100,7 @@ static int opt_print_cache;
 int opt_verbose;
 
 /* Format to support.  */
-/* 0: only libc5/glibc2; 1: both; 2: only glibc 2.2.  */
-int opt_format = 2;
+enum opt_format opt_format = opt_format_new;
 
 /* Build cache.  */
 static int opt_build_cache = 1;
@@ -281,11 +280,11 @@ parse_opt (int key, char *arg, struct argp_state *state)
       break;
     case 'c':
       if (strcmp (arg, "old") == 0)
-	opt_format = 0;
+	opt_format = opt_format_old;
       else if (strcmp (arg, "compat") == 0)
-	opt_format = 1;
+	opt_format = opt_format_compat;
       else if (strcmp (arg, "new") == 0)
-	opt_format = 2;
+	opt_format = opt_format_new;
       break;
     default:
       return ARGP_ERR_UNKNOWN;
diff --git a/sysdeps/generic/ldconfig.h b/sysdeps/generic/ldconfig.h
index 6774212110d23eae..b15b142511829436 100644
--- a/sysdeps/generic/ldconfig.h
+++ b/sysdeps/generic/ldconfig.h
@@ -90,7 +90,14 @@ extern char *chroot_canon (const char *chroot, const char *name);
 /* Declared in ldconfig.c.  */
 extern int opt_verbose;
 
-extern int opt_format;
+enum opt_format
+  {
+    opt_format_old = 0,	/* Use struct cache_file.  */
+    opt_format_compat = 1, /* Use both, old format followed by new.  */
+    opt_format_new = 2,	/* Use struct cache_file_new.  */
+  };
+
+extern enum opt_format opt_format;
 
 /* Prototypes for a few program-wide used functions.  */
 #include <programs/xmalloc.h>