Adding upstream version 1.21.4.upstream/1.21.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/m4/chdir-long.m4 b/m4/chdir-long.m4
new file mode 100644
index 0000000..4a92b30
--- /dev/null
+++ b/m4/chdir-long.m4
@@ -0,0 +1,30 @@
+#serial 17
+
+# 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, 2009-2023 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_REQUIRE([gl_PATHMAX_SNIPPET_PREREQ])
+  AC_CACHE_CHECK([whether this system supports file names of any length],
+    [gl_cv_have_unlimited_file_name_length],
+    [AC_EGREP_CPP([have_arbitrary_file_name_length_limit],
+                  gl_PATHMAX_SNIPPET[
+#ifdef PATH_MAX
+have_arbitrary_file_name_length_limit
+#endif],
+    [gl_cv_have_unlimited_file_name_length=no],
+    [gl_cv_have_unlimited_file_name_length=yes])])
+])
+
+AC_DEFUN([gl_PREREQ_CHDIR_LONG], [:])