Output to confdefs.h directly.

[gnulib.git] / m4 / readdir.m4

diff --git a/m4/readdir.m4 b/m4/readdir.m4
index c73c156..d851b0f 100644 (file)
--- a/m4/readdir.m4
+++ b/m4/readdir.m4
@@ -1,6 +1,16 @@
-#serial 1
+#serial 3
 
-dnl FIXME: describe
+dnl SunOS's readdir is broken in such a way that rm.c has to add extra code
+dnl to test whether a NULL return value really means there are no more files
+dnl in the directory.
+dnl
+dnl Detect the problem by creating a directory containing 300 files (254 not
+dnl counting . and .. is the minimum) and see if a loop doing `readdir; unlink'
+dnl removes all of them.
+dnl
+dnl Define HAVE_WORKING_READDIR if readdir does *not* have this problem.
+
+dnl Written by Jim Meyering.
 
 AC_DEFUN(jm_FUNC_READDIR,
 [dnl
@@ -13,9 +23,7 @@ AC_CACHE_CHECK([for working readdir], jm_cv_func_working_readdir,
   ac_clean_files="$ac_clean_files conf-dir"
 
   AC_TRY_RUN(
-  changequote(<<, >>)dnl
-  <<
-#   include <stdio.h>
+[#   include <stdio.h>
 #   include <sys/types.h>
 #   if HAVE_STRING_H
 #    include <string.h>
@@ -109,23 +117,13 @@ AC_CACHE_CHECK([for working readdir], jm_cv_func_working_readdir,
       create_300_file_dir (dir);
       remove_dir (dir);
       exit (0);
-    }
-  >>,
-  changequote([, ])dnl
+    }],
   jm_cv_func_working_readdir=yes,
   jm_cv_func_working_readdir=no,
   jm_cv_func_working_readdir=no)])
 
-  if test x = y; then
-    dnl This code is deliberately never run via ./configure.
-    dnl FIXME: this is a gross hack to make autoheader put an entry
-    dnl for this HAVE_-prefixed symbol in config.h.in.
-    AC_CHECK_FUNCS(WORKING_READDIR)
-  fi
-
-
   if test $jm_cv_func_working_readdir = yes; then
-    ac_kludge=HAVE_WORKING_READDIR
-    AC_DEFINE_UNQUOTED($ac_kludge)
+    AC_DEFINE_UNQUOTED(HAVE_WORKING_READDIR, 1,
+[Define if readdir is found to work properly in some unusual cases. ])
   fi
 ])