Re: fix for single threaded configurations

[Andreas Tobler <toa at pop dot agri dot ch>]

John David Anglin wrote:
> > We do not want to use the reentrant functions like getpwuid_r or others 
> > when we do not have a threaded environment.
>
> Yes.
>
> > The mentioned function(s) is(are) only available on systems which 
> > supports the POSIX threads.
>
> Not quite true.  The DCE thread environment on hpux10 has all these
> functions but they have slightly different declararations.  The code
> as it presently exists won't work with the hpux10 variants.

Well, I based on this:
http://www.opengroup.org/onlinepubs/009695399/functions/getpwuid.html

Issue 5 and 6.

> > So an additional check on _POSIX_PTHREAD_SEMANTICS should be enough to 
> > make it work.
>
> Agreed.  We don't want to use these functions with DCE threads.
> Hopefully, they aren't used with any other thread model.

Hopefully we will hear.

> > The actual use case is a single threaded config on hpux-pa, the _r 
> > functions are available in the headers check but not in the lib we link.
>
> Actually, it's the reverse.  There's no declaration check in configure
> except for gethostbyaddr_r.  The lib check detects the functions so we go
> ahead and try to use the functions.  However, the build fails in the no
> thread case because _REENTRANT isn't defined and the functions aren't
> declared.

You're right, I saw it after sending the patch.

I hope I did not break anything here. Otherwise, I'll fix.

Thank you for the comments.

Andreas