Merge branch 'upstream' into dfsg-orig

[tar] / m4 / readlinkat.m4

diff --git a/m4/readlinkat.m4 b/m4/readlinkat.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/readlinkat.m4
@@ -0,0 +1,21 @@
+# serial 1
+# See if we need to provide readlinkat replacement.
+
+dnl Copyright (C) 2009-2010 Free Software Foundation, 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.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_READLINKAT],
+[
+  AC_REQUIRE([gl_FUNC_OPENAT])
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_CHECK_FUNCS_ONCE([readlinkat])
+  if test $ac_cv_func_readlinkat = no; then
+    HAVE_READLINKAT=0
+    AC_LIBOBJ([readlinkat])
+  fi
+])