stdio: Split __get_errname definition from errlist.c

The loader does not need to pull all __get_errlist definitions
and its size is decreased:

Before:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 197774   11024     456  209254   33166 elf/ld.so

After:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 191510    9936     456  201902   314ae elf/ld.so

Checked on x86_64-linux-gnu.

1 files changed, 2 insertions, 36 deletions

diff --git a/stdio-common/errlist.c b/stdio-common/errlist.c
index 310b858e31..1c09a31a7a 100644
--- a/stdio-common/errlist.c
+++ b/stdio-common/errlist.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
+/* Internal errno names mapping definition.
+   Copyright (C) 1991-2022 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -40,39 +41,4 @@ __get_errlist (int errnum)
   return NULL;
 }
 
-static const union sys_errname_t
-{
-  struct
-  {
-#define MSGSTRFIELD1(line) str##line
-#define MSGSTRFIELD(line)  MSGSTRFIELD1(line)
-#define _S(n, str)         char MSGSTRFIELD(__LINE__)[sizeof(#n)];
-#include <errlist.h>
-#undef _S
-  };
-  char str[0];
-} _sys_errname = { {
-#define _S(n, s) #n,
-#include <errlist.h>
-#undef _S
-} };
-
-static const unsigned short _sys_errnameidx[] =
-{
-#define _S(n, s) \
-  [ERR_MAP(n)] = offsetof(union sys_errname_t, MSGSTRFIELD(__LINE__)),
-#include <errlist.h>
-#undef _S
-};
-
-const char *
-__get_errname (int errnum)
-{
-  int mapped = ERR_MAP (errnum);
-  if (mapped < 0 || mapped >= array_length (_sys_errnameidx)
-      || (mapped > 0 && _sys_errnameidx[mapped] == 0))
-    return NULL;
-  return _sys_errname.str + _sys_errnameidx[mapped];
-}
-
 #include <errlist-compat.c>