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m4/chdir.m4

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+#serial 1
+
+# From Jim Meyering.
+# Use Gnulib's robust replacement chdir function.
+# It can handle arbitrarily long directory names, which means
+# that when it is given the name of an existing directory, it
+# never fails with ENAMETOOLONG.
+#
+# FIXME: we don't really want to use this function on systems that
+# do not define PATH_MAX...
+#
+# It still fails with ENAMETOOLONG if the specified directory
+# name contains a component that would provoke such a failure
+# all by itself (e.g. if the component is longer than PATH_MAX
+# on systems that define PATH_MAX).
+
+AC_DEFUN([gl_FUNC_CHDIR],
+[
+  AC_LIBOBJ([chdir])
+  AC_DEFINE([__CHDIR_PREFIX], [[rpl_]],
+    [Define to rpl_ if the chdir replacement function should be used.])
+  gl_PREREQ_CHDIR
+])
+
+AC_DEFUN([gl_PREREQ_CHDIR],
+[
+  AM_STDBOOL_H
+  gl_FUNC_MEMPCPY
+  gl_FUNC_OPENAT
+])