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Re: Windows 64 port

From: Eli Zaretskii
Subject: Re: Windows 64 port
Date: Sat, 03 Mar 2012 09:58:10 +0200

> From: Fabrice Popineau <address@hidden>
> Date: Thu, 1 Mar 2012 08:24:40 +0100
> Cc: Eli Zaretskii <address@hidden>, address@hidden, address@hidden
> >   /* Include <time.h> before defining tzname, to avoid DLL clash.  */
> >   #include <time.h>
> >   #define tzname _tzname
> > [...]
> The problem is trickier than this and probably need a careful
> rewrite of ms-w32.h.  In this file, names like tzname or fopen get
> rewired. Some of them need to be rewired to sys_fopen or _fopen
> (example) depending on whether it is for emacs or not.  So a more
> robust way of doing things would be to ensure that all system
> headers are read once for all, then doing the rewiring for emacs and
> for (not emacs). That should avoid the problem of tzname for
> example. In the mean time, this is the smallest change I could come
> with.  What you propose didn't work (resulting in either : some
> function returns an array, that is tzname, or _tzname being
> undefined at link time).

Can you show me the error messages, please, and perhaps also the
relevant portions of the MS headers that trigger them?  Including
time.h before redefining tzname is exactly what you proposed (for
system headers to be included before redefining), so I'm puzzled about
what exactly went wrong in the case of tzname, and why what you
suggest as a general method of fixing these problems didn't work in
this particular case.

> > >     >  #ifdef WINDOWSNT
> > >     >  extern Lisp_Object w32_get_internal_run_time (void);
> > >     > +
> > >     > +extern struct tm *localtime (const time_t *t);
> > >     >  #endif
> > >
> > >     Why is this needed?  It seems also unrelated to 64-bit Windows.
> Sure but the definition needs to be put somewhere because an int is
> not the same size as a pointer in windows 64.

But editfns.c includes "systime.h", which does this:

  #include <sys/time.h>
  #include <time.h>
  #ifdef HAVE_SYS_TIME_H
  #include <sys/time.h>
  #include <time.h>

On Windows, ms-w32.h defines TIME_WITH_SYS_TIME to 1, so the above
should have included the system header time.h, which I believe
includes the prototype of localtime.  So could you please look into
this some more and find out why all this isn't working for you?


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