1 files changed, 45 insertions, 0 deletions
diff --git a/m4/ftw.m4 b/m4/ftw.m4
new file mode 100644
index 000000000..bbb366e52
--- /dev/null
+++ b/m4/ftw.m4
@@ -0,0 +1,45 @@
+#serial 1
+# Use replacement ftw.c if the one in the C library is inadequate or buggy.
+# From Jim Meyering
+
+AC_DEFUN([AC_FUNC_FTW],
+[AC_CACHE_CHECK([for working GNU ftw], ac_cv_func_ftw_working,
+[
+  # prerequisites
+  AC_REQUIRE([AC_HEADER_DIRENT])
+  AC_CHECK_HEADERS(sys/param.h)
+
+  # The following test would fail prior to glibc-2.3.2, because `depth'
+  # would be 2 rather than 4.
+  mkdir -p conftest.dir/a/b/c
+  AC_RUN_IFELSE([AC_LANG_SOURCE([], [[
+#include <string.h>
+#include <stdlib.h>
+#include <ftw.h>
+
+static char *_f[] = { "conftest.dir", "conftest.dir/a",
+		      "conftest.dir/a/b", "conftest.dir/a/b/c" };
+static char **p = _f;
+static int depth;
+
+static int
+cb (const char *file, const struct stat *sb, int file_type, struct FTW *info)
+{
+  if (strcmp (file, *p++) != 0)
+    exit (1);
+  ++depth;
+  return 0;
+}
+
+int
+main ()
+{
+  int err = nftw ("conftest.dir", cb, 30, FTW_PHYS | FTW_MOUNT | FTW_CHDIR);
+  exit ((err == 0 && depth == 4) ? 0 : 1);
+}
+]])],
+               [ac_cv_func_ftw_working=yes],
+               [ac_cv_func_ftw_working=no],
+               [ac_cv_func_ftw_working=no])])
+test $ac_cv_func_ftw_working = no && AC_LIBOBJ([ftw])
+])# AC_FUNC_FTW