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libiconv 1.16

    1: # glibc21.m4 serial 5
    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 2.1 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: )