nptl/libpthread-compat.c

   1 /* Placeholder definitions to pull in removed symbol versions.
   2    Copyright (C) 2019-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/cdefs.h>
  20 #include <shlib-compat.h>
  21
  22 #ifdef SHARED
  23 static void
  24 attribute_compat_text_section
  25 __attribute_used__
  26 __libpthread_version_placeholder (void)
  27 {
  28 }
  29 #endif
  30
  31 /* This is an unused compatibility symbol definition, to prevent ld
  32    from creating a weak version definition for GLIBC_2.1.2.  (__vfork
  33    used to be defined at that version, but it is now provided by libc,
  34    and there are no versions left in libpthread for that symbol
  35    version.)  If the ABI baseline for glibc is the GLIBC_2.2 symbol
  36    version or later, the placeholder symbol is not needed because
  37    there are plenty of other symbols which populate those later
  38    versions.  */
  39 #if (SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_2))
  40 compat_symbol_unique (libpthread,
  41                       __libpthread_version_placeholder, GLIBC_2_1_2);
  42 #endif
  43
  44 #if (SHLIB_COMPAT (libpthread, GLIBC_2_2_3, GLIBC_2_2_4))
  45 compat_symbol_unique (libpthread,
  46                       __libpthread_version_placeholder, GLIBC_2_2_3);
  47 #endif
  48
  49 #if (SHLIB_COMPAT (libpthread, GLIBC_2_2_6, GLIBC_2_3))
  50 compat_symbol_unique (libpthread,
  51                       __libpthread_version_placeholder, GLIBC_2_2_6);
  52 #endif