sys/reent.h and time.h

[geoffb@bops.com]

> From: J. Johnston [ mailto:jjohnstn@cygnus.com ]
> 
> geoffb@bops.com wrote:
> > 
> > The comment at the top of sys/reent.h says:
> > 
> > /* WARNING: All identifiers here must begin with an 
> underscore.  This file
> > is
> >    included by stdio.h and others and we therefore must 
> only use identifiers
> >    in the namespace allotted to us.  */
> > 
> > but reent.h includes time.h (presumably to get `struct tm') 
> which brings in
> > quite a few identifiers that don't begin with an 
> underscore.  The upshot is
> > the following program won't compile:
> > 
> >         #include <stdio.h>
> > 
> >         int
> >         main ()
> >         {
> >                 int time = 0;
> >                 printf ("%d", time);
> >         }
> > 
> > since time is defined in time.h.
> > 
> > Is this a known problem?  What is the best approach to fixing this?
> > 
> > Please CC me as I'm not on the list (yet).
> > 
> 
> IMO the best way to fix this is to do what gcc does with 
> stddef.h when it
> only wants to have size_t declared.  A __need_struct_tm 
> setting before including
> time.h should remove all but the desired type declaration.  I 
> have attached such a 
> patch, but I haven't tested it yet.
> 
> -- Jeff J.

But then you still get struct tm in your namespace.  What I ended
up doing was declaring a struct _tm that matches struct tm and
casting it to struct tm in lcltime.c.

-- 
Geoff Berry