m4/glibc2.m4

   1 # glibc2.m4 serial 3
   2 dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2019 Free Software Foundation,
   3 dnl Inc.
   4 dnl This file is free software; the Free Software Foundation
   5 dnl gives unlimited permission to copy and/or distribute it,
   6 dnl with or without modifications, as long as this notice is preserved.
   7
   8 # Test for the GNU C Library, version 2.0 or newer.
   9 # From Bruno Haible.
  10
  11 AC_DEFUN([gt_GLIBC2],
  12   [
  13     AC_CACHE_CHECK([whether we are using the GNU C Library 2 or newer],
  14       [ac_cv_gnu_library_2],
  15       [AC_EGREP_CPP([Lucky GNU user],
  16         [
  17 #include <features.h>
  18 #ifdef __GNU_LIBRARY__
  19  #if (__GLIBC__ >= 2) && !defined __UCLIBC__
  20   Lucky GNU user
  21  #endif
  22 #endif
  23         ],
  24         [ac_cv_gnu_library_2=yes],
  25         [ac_cv_gnu_library_2=no])
  26       ]
  27     )
  28     AC_SUBST([GLIBC2])
  29     GLIBC2="$ac_cv_gnu_library_2"
  30   ]
  31 )