# glibc21.m4 serial 5

dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2018 Free Software Foundation,

dnl Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

# Test for the GNU C Library, version 2.1 or newer, or uClibc.

# From Bruno Haible.

AC_DEFUN([gl_GLIBC21],

  [

    AC_CACHE_CHECK([whether we are using the GNU C Library >= 2.1 or uClibc],

      [ac_cv_gnu_library_2_1],

      [AC_EGREP_CPP([Lucky],

        [

#include <features.h>

#ifdef __GNU_LIBRARY__

 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)

  Lucky GNU user

 #endif

#endif

#ifdef __UCLIBC__

 Lucky user

#endif

        ],

        [ac_cv_gnu_library_2_1=yes],

        [ac_cv_gnu_library_2_1=no])

      ]

    )

    AC_SUBST([GLIBC21])

    GLIBC21="$ac_cv_gnu_library_2_1"

  ]

)