diff --git a/elf/cache.c b/elf/cache.c
index dbf4c83a7a61..111888cafb3c 100644
--- a/elf/cache.c
+++ b/elf/cache.c
@@ -158,6 +158,7 @@ struct cache_entry
 /* List of all cache entries.  */
 static struct cache_entry *entries;
 
+/* libc4, ELF and libc5 are unsupported */
 static const char *flag_descr[] =
 { "libc4", "ELF", "libc5", "libc6"};
 
@@ -169,14 +170,11 @@ print_entry (const char *lib, int flag, unsigned int osversion,
   printf ("\t%s (", lib);
   switch (flag & FLAG_TYPE_MASK)
     {
-    case FLAG_LIBC4:
-    case FLAG_ELF:
-    case FLAG_ELF_LIBC5:
     case FLAG_ELF_LIBC6:
       fputs (flag_descr[flag & FLAG_TYPE_MASK], stdout);
       break;
     default:
-      fputs (_("unknown"), stdout);
+      fputs (_("Unknown or unsupported flag"), stdout);
       break;
     }
   switch (flag & FLAG_REQUIRED_MASK)
diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index 57bb95ebc334..5fe133937574 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -65,19 +65,6 @@
 
 #define PACKAGE _libc_intl_domainname
 
-static const struct
-{
-  const char *name;
-  int flag;
-} lib_types[] =
-{
-  {"libc4", FLAG_LIBC4},
-  {"libc5", FLAG_ELF_LIBC5},
-  {"libc6", FLAG_ELF_LIBC6},
-  {"glibc2", FLAG_ELF_LIBC6}
-};
-
-
 /* List of directories to handle.  */
 struct dir_entry
 {
@@ -471,25 +458,7 @@ add_dir_1 (const char *line, const char *from_file, int from_line)
 
   /* Search for an '=' sign.  */
   entry->path = xstrdup (line);
-  char *equal_sign = strchr (entry->path, '=');
-  if (equal_sign)
-    {
-      *equal_sign = '\0';
-      ++equal_sign;
-      entry->flag = FLAG_ANY;
-      for (i = 0; i < sizeof (lib_types) / sizeof (lib_types[0]); ++i)
-	if (strcmp (equal_sign, lib_types[i].name) == 0)
-	  {
-	    entry->flag = lib_types[i].flag;
-	    break;
-	  }
-      if (entry->flag == FLAG_ANY)
-	error (0, 0, _("%s is not a known library type"), equal_sign);
-    }
-  else
-    {
-      entry->flag = FLAG_ANY;
-    }
+  entry->flag = FLAG_ELF_LIBC6;
 
   /* Canonify path: for now only remove leading and trailing
      whitespace and the trailing slashes.  */
diff --git a/elf/readelflib.c b/elf/readelflib.c
index e147416363c2..51e90fb56ad9 100644
--- a/elf/readelflib.c
+++ b/elf/readelflib.c
@@ -44,7 +44,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 		  char **soname, void *file_contents, size_t file_length)
 {
   int i;
-  unsigned int j;
   unsigned int dynamic_addr;
   size_t dynamic_size;
   char *program_interpreter;
@@ -82,9 +81,8 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
   elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents);
   check_ptr (elf_pheader);
 
-  /* The library is an elf library, now search for soname and
-     libc5/libc6.  */
-  *flag = FLAG_ELF;
+  /* The library is an elf library   */
+  *flag = FLAG_ELF_LIBC6;
 
   /* The default ISA level is 0.  */
   *isa_level = 0;
@@ -111,16 +109,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 	  program_interpreter = (char *) (file_contents + segment->p_offset);
 	  check_ptr (program_interpreter);
 
-	  /* Check if this is enough to classify the binary.  */
-	  for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]);
-	       ++j)
-	    if (strcmp (program_interpreter, interpreters[j].soname) == 0)
-	      {
-		*flag = interpreters[j].flag;
-		break;
-	      }
-	  break;
-
 	case PT_NOTE:
 	  if (!*osversion && segment->p_filesz >= 32 && segment->p_align >= 4)
 	    {
@@ -291,38 +279,16 @@ done:
   if (dynamic_strings == NULL)
     return 1;
 
-  /* Now read the DT_NEEDED and DT_SONAME entries.  */
+  /* Now read the DT_SONAME entries.  */
   for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
        ++dyn_entry)
     {
-      if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME)
+      if (dyn_entry->d_tag == DT_SONAME)
 	{
 	  char *name = dynamic_strings + dyn_entry->d_un.d_val;
 	  check_ptr (name);
-
-	  if (dyn_entry->d_tag == DT_NEEDED)
-	    {
-
-	      if (*flag == FLAG_ELF)
-		{
-		  /* Check if this is enough to classify the binary.  */
-		  for (j = 0;
-		       j < sizeof (known_libs) / sizeof (known_libs [0]);
-		       ++j)
-		    if (strcmp (name, known_libs [j].soname) == 0)
-		      {
-			*flag = known_libs [j].flag;
-			break;
-		      }
-		}
-	    }
-
-	  else if (dyn_entry->d_tag == DT_SONAME)
-	    *soname = xstrdup (name);
-
-	  /* Do we have everything we need?  */
-	  if (*soname && *flag != FLAG_ELF)
-	    return 0;
+          *soname = xstrdup (name);
+          return 0;
 	}
     }
 
diff --git a/elf/readlib.c b/elf/readlib.c
index 3651dcdd8e3d..1807aa16f20f 100644
--- a/elf/readlib.c
+++ b/elf/readlib.c
@@ -43,24 +43,6 @@ struct known_names
   int flag;
 };
 
-static struct known_names interpreters[] =
-{
-  { "/lib/" LD_SO, FLAG_ELF_LIBC6 },
-#ifdef SYSDEP_KNOWN_INTERPRETER_NAMES
-  SYSDEP_KNOWN_INTERPRETER_NAMES
-#endif
-};
-
-static struct known_names known_libs[] =
-{
-  { LIBC_SO, FLAG_ELF_LIBC6 },
-  { LIBM_SO, FLAG_ELF_LIBC6 },
-#ifdef SYSDEP_KNOWN_LIBRARY_NAMES
-  SYSDEP_KNOWN_LIBRARY_NAMES
-#endif
-};
-
-
 /* Check if string corresponds to a GDB Python file.  */
 static bool
 is_gdb_python_file (const char *name)
@@ -84,7 +66,8 @@ process_file (const char *real_file_name, const char *file_name,
   struct exec *aout_header;
 
   ret = 0;
-  *flag = FLAG_ANY;
+  /* Just set FLAG_ELF_LIBC6 as old formats are not supported anymore.  */
+  *flag = FLAG_ELF_LIBC6;
   *soname = NULL;
 
   file = fopen (real_file_name, "rb");
@@ -151,7 +134,6 @@ process_file (const char *real_file_name, const char *file_name,
 	    *dot = '\0';
 	}
       *soname = copy;
-      *flag = FLAG_LIBC4;
       goto done;
     }
 
@@ -192,9 +174,6 @@ implicit_soname (const char *lib, int flag)
 {
   char *soname = xstrdup (lib);
 
-  if ((flag & FLAG_TYPE_MASK) != FLAG_LIBC4)
-    return soname;
-
   /* Aout files don't have a soname, just return the name
      including the major number.  */
   char *major = strstr (soname, ".so.");
diff --git a/sysdeps/unix/sysv/linux/aarch64/ldconfig.h b/sysdeps/unix/sysv/linux/aarch64/ldconfig.h
index 5cbfb327141d..69871151ed8c 100644
--- a/sysdeps/unix/sysv/linux/aarch64/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/aarch64/ldconfig.h
@@ -17,14 +17,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld-linux-aarch64.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux-aarch64_be.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux-aarch64_ilp32.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux-aarch64_be_ilp32.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux.so.3", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux-armhf.so.3", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/arc/ldconfig.h b/sysdeps/unix/sysv/linux/arc/ldconfig.h
index f673170e59a2..ed019a8cdb61 100644
--- a/sysdeps/unix/sysv/linux/arc/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/arc/ldconfig.h
@@ -17,11 +17,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES 		\
-  { "/lib/ld-linux-arc.so.2", FLAG_ELF_LIBC6 },	\
-  { "/lib/ld-linux-arceb.so.2", FLAG_ELF_LIBC6 },
-
-#define SYSDEP_KNOWN_LIBRARY_NAMES 	\
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/arm/ldconfig.h b/sysdeps/unix/sysv/linux/arm/ldconfig.h
index d1253993eaa1..9afda09cca63 100644
--- a/sysdeps/unix/sysv/linux/arm/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/arm/ldconfig.h
@@ -16,10 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld-linux.so.3", FLAG_ELF_LIBC6 }, \
-  { "/lib/ld-linux-armhf.so.3", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/csky/ldconfig.h b/sysdeps/unix/sysv/linux/csky/ldconfig.h
index fbe17e3dc81f..d4bea7b9e465 100644
--- a/sysdeps/unix/sysv/linux/csky/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/csky/ldconfig.h
@@ -26,9 +26,3 @@
 #else
 # define LD_SO_ABI "cskyv2"
 #endif
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES	\
-  { LD_SO_PREFIX LD_SO_ABI LD_SO_SUFFIX, FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES	\
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/i386/ldconfig.h b/sysdeps/unix/sysv/linux/i386/ldconfig.h
index bafbec1231c7..9afda09cca63 100644
--- a/sysdeps/unix/sysv/linux/i386/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/i386/ldconfig.h
@@ -16,9 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld-linux.so.1", FLAG_ELF_LIBC5 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.5", FLAG_ELF_LIBC5 },	\
-  { "libm.so.5", FLAG_ELF_LIBC5 },
diff --git a/sysdeps/unix/sysv/linux/ia64/ldconfig.h b/sysdeps/unix/sysv/linux/ia64/ldconfig.h
index 4731419bf87b..9afda09cca63 100644
--- a/sysdeps/unix/sysv/linux/ia64/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/ia64/ldconfig.h
@@ -16,9 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld-linux.so.2", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h b/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h
index ac82941affb2..3f2c7cadbbb2 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h
@@ -16,10 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib32/ld.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib64/ld.so.1", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/powerpc/ldconfig.h b/sysdeps/unix/sysv/linux/powerpc/ldconfig.h
index 1d70657838c2..0791e3020a57 100644
--- a/sysdeps/unix/sysv/linux/powerpc/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/powerpc/ldconfig.h
@@ -17,11 +17,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld.so.1", FLAG_ELF_LIBC6 },	\
-  { "/lib64/ld64.so.1", FLAG_ELF_LIBC6 }, \
-  { "/lib64/ld64.so.2", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/riscv/ldconfig.h b/sysdeps/unix/sysv/linux/riscv/ldconfig.h
index e3847f116e00..5308926d8837 100644
--- a/sysdeps/unix/sysv/linux/riscv/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h
@@ -17,20 +17,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define LD_SO_PREFIX "/lib/ld-linux-"
-#define LD_SO_SUFFIX ".so.1"
-
-#if __riscv_xlen == 64
-# define LD_SO_ABI "riscv64-lp64"
-#else
-# define LD_SO_ABI "riscv32-ilp32"
-#endif
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES				\
-  { LD_SO_PREFIX LD_SO_ABI "d" LD_SO_SUFFIX, FLAG_ELF_LIBC6 },	\
-  { LD_SO_PREFIX LD_SO_ABI     LD_SO_SUFFIX, FLAG_ELF_LIBC6 },
-
-#define SYSDEP_KNOWN_LIBRARY_NAMES	\
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/s390/ldconfig.h b/sysdeps/unix/sysv/linux/s390/ldconfig.h
index f564a6eaf673..9afda09cca63 100644
--- a/sysdeps/unix/sysv/linux/s390/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/s390/ldconfig.h
@@ -16,10 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld.so.1", FLAG_ELF_LIBC6 },	\
-  { "/lib/ld64.so.1", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/x86_64/ldconfig.h b/sysdeps/unix/sysv/linux/x86_64/ldconfig.h
index b67203e0175c..9afda09cca63 100644
--- a/sysdeps/unix/sysv/linux/x86_64/ldconfig.h
+++ b/sysdeps/unix/sysv/linux/x86_64/ldconfig.h
@@ -16,11 +16,3 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdeps/generic/ldconfig.h>
-
-#define SYSDEP_KNOWN_INTERPRETER_NAMES \
-  { "/lib/ld-linux.so.2", FLAG_ELF_LIBC6 }, \
-  { "/libx32/ld-linux-x32.so.2", FLAG_ELF_LIBC6 }, \
-  { "/lib64/ld-linux-x86-64.so.2", FLAG_ELF_LIBC6 },
-#define SYSDEP_KNOWN_LIBRARY_NAMES \
-  { "libc.so.6", FLAG_ELF_LIBC6 },	\
-  { "libm.so.6", FLAG_ELF_LIBC6 },
