1: # glibc21.m4 serial 5
2: dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2013 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 2.1 or newer, or uClibc.
9: # From Bruno Haible.
10:
11: AC_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: )
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