1# glibc21.m4 serial 5
2dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2012 Free Software Foundation,
3dnl Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8# Test for the GNU C Library, version 2.1 or newer, or uClibc.
9# From Bruno Haible.
10
11AC_DEFUN([gl_GLIBC21],
12  [
13    AC_CACHE_CHECK([whether we are using the GNU C Library >= 2.1 or uClibc],
14      [ac_cv_gnu_library_2_1],
15      [AC_EGREP_CPP([Lucky],
16        [
17#include <features.h>
18#ifdef __GNU_LIBRARY__
19 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)
20  Lucky GNU user
21 #endif
22#endif
23#ifdef __UCLIBC__
24 Lucky user
25#endif
26        ],
27        [ac_cv_gnu_library_2_1=yes],
28        [ac_cv_gnu_library_2_1=no])
29      ]
30    )
31    AC_SUBST([GLIBC21])
32    GLIBC21="$ac_cv_gnu_library_2_1"
33  ]
34)
35