Imported Upstream version 1.4

[debian/gzip] / m4 / chdir-long.m4

diff --git a/m4/chdir-long.m4 b/m4/chdir-long.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/chdir-long.m4
@@ -0,0 +1,39 @@
+#serial 11
+
+# Use Gnulib's robust 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.
+# Arrange to compile chdir-long.c only on systems that define PATH_MAX.
+
+dnl Copyright (C) 2004-2007, 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 Jim Meyering.
+
+AC_DEFUN([gl_FUNC_CHDIR_LONG],
+[
+  AC_CACHE_CHECK([whether this system has an arbitrary file name length limit],
+    gl_cv_have_arbitrary_file_name_length_limit,
+    [AC_EGREP_CPP([have_arbitrary_file_name_length_limit],
+                  [#include <unistd.h>
+#include <limits.h>
+#if defined PATH_MAX || defined MAXPATHLEN
+have_arbitrary_file_name_length_limit
+#endif],
+    gl_cv_have_arbitrary_file_name_length_limit=yes,
+    gl_cv_have_arbitrary_file_name_length_limit=no)])
+
+  if test $gl_cv_have_arbitrary_file_name_length_limit = yes; then
+    AC_LIBOBJ([chdir-long])
+    gl_PREREQ_CHDIR_LONG
+  fi
+])
+
+AC_DEFUN([gl_PREREQ_CHDIR_LONG],
+[
+  AC_REQUIRE([AC_C_INLINE])
+  :
+])