patch for autoconf manual

[Martin Pool]

In the "Limitations of Usual Tools" page you might like to add a note
that the -h and -L options to "test" specified by the current POSIX
and SUS specifications and implemented in GNU are not portable.  In
fact, on Solaris 8 they fail in a rather bizarre and confusing way:

$ ln -s /nowhere bad
$ ls -l bad
lrwxrwxrwx   1 josb     user            8 Mar 13 20:10 bad -> /nowhere
$ if test -L bad; then echo bad; fi
test: argument expected
$ if test -h bad; then echo bad; fi
bad
$

Jos Backus helped me work this out.

I am not sure what a good portable way to test for symlinks from the
shell would be.  Perhaps grepping the output of 'ls -l'?  In rsync I'm
planning to just provide a small C program that can be called.

You can see that many people have already had to puzzle this out for
themselves:

  http://www.google.com/search?q=solaris+test+%22argument+expected%22

-- 
Martin