(fetish_FUNC_RMDIR_NOTEMPTY): New macro and file.

m4/rmdir-errno.m4

@@ -0,0 +1,43 @@
+#serial 1
+
+# When rmdir fails because the specified directory is not empty, it sets
+# errno to some value, usually ENOTEMPTY.  However, on some AIX systems,
+# ENOTEMPTY is mistakenly defined to be EEXIST.  To work around this, and
+# in general, to avoid depending on the use of any particular symbol, this
+# test runs a test to determine the actual numeric value.
+AC_DEFUN(fetish_FUNC_RMDIR_NOTEMPTY,
+[dnl
+  AC_CACHE_CHECK([for rmdir-not-empty errno value],
+    fetish_cv_func_rmdir_errno_not_empty,
+    [
+      # Arrange for deletion of the temporary directory this test creates.
+      ac_clean_files="$ac_clean_files confdir2"
+      mkdir confdir2; : > confdir2/file
+      AC_TRY_RUN([
+#include <stdio.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+	int main ()
+	{
+	  FILE *s;
+	  int val;
+	  rmdir ("confdir2");
+	  val = errno;
+	  s = fopen ("confdir2/file", "w");
+	  fprintf (s, "%d\n", val);
+	  exit (0);
+	}
+	],
+      fetish_cv_func_rmdir_errno_not_empty=`cat confdir2/file`,
+      fetish_cv_func_rmdir_errno_not_empty='configure error in rmdir-errno.m4',
+      fetish_cv_func_rmdir_errno_not_empty=ENOTEMPTY
+      )
+    ]
+  )
+
+  AC_DEFINE_UNQUOTED([RMDIR_ERRNO_NOT_EMPTY],
+    $fetish_cv_func_rmdir_errno_not_empty,
+    [the value to which errno is set when rmdir fails on a nonempty directory])
+])