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-rw-r--r--m4/glibc21.m434
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diff --git a/m4/glibc21.m4 b/m4/glibc21.m4
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+# glibc21.m4 serial 5
+dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2019 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"
+ ]
+)