tools/missing-macros/src/m4/glibc21.m4

   1 # glibc21.m4 serial 4
   2 dnl Copyright (C) 2000-2002, 2004, 2008-2010 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 # Test for the GNU C Library, version 2.1 or newer.
   8 # From Bruno Haible.
   9
  10 AC_DEFUN([gl_GLIBC21],
  11   [
  12     AC_CACHE_CHECK([whether we are using the GNU C Library 2.1 or newer],
  13       [ac_cv_gnu_library_2_1],
  14       [AC_EGREP_CPP([Lucky GNU user],
  15         [
  16 #include <features.h>
  17 #ifdef __GNU_LIBRARY__
  18  #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)
  19   Lucky GNU user
  20  #endif
  21 #endif
  22         ],
  23         [ac_cv_gnu_library_2_1=yes],
  24         [ac_cv_gnu_library_2_1=no])
  25       ]
  26     )
  27     AC_SUBST([GLIBC21])
  28     GLIBC21="$ac_cv_gnu_library_2_1"
  29   ]
  30 )