Re: gsize vs. size_t

[Owen Taylor <otaylor redhat com>]

Miroslaw Dobrzanski-Neumann <mne mosaic-ag com> writes:

> On Tue, Feb 19, 2002 at 05:37:23PM -0500, Owen Taylor wrote:
> > 
> > Joel Becker <jlbec evilplan org> writes:
> > 
> > > On Tue, Feb 19, 2002 at 04:39:20PM +0100, Miroslaw Dobrzanski-Neumann wrote:
> > > > Hi
> > > > I get the followin errors when compiling on AIX
> > > > 
> > > > it is because size_t is unsigned long and gsize is unsigned int at when calling g_iconv()
> > > > 
> > > > glib-1.3.14/glib/giochannel.c
> > > > 
> > > > xlc_r -DHAVE_CONFIG_H -I. -I. -I.. -I.. -DG_LOG_DOMAIN=\"GLib\" -DG_ENABLE_DEBUG -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -I/net/DAGOBERT/dataE3/bef/mne/SYSTEM/include -g -D_REENTRANT -D_THREAD_SAFE -c giochannel.c  -DPIC
> > > > "giochannel.c", line 1246.51: 1506-280 (E) Function argument assignment between types "unsigned int*" and "unsigned long*" is not allowed.
> > > 
> > > 	Yay ANSI!  What's happening here is that configure.in does
> > > GLIB_SIZEOF(size_t).  That does sizeof(size_t), which is 4 on a 32-bit
> > > RS/6000.  configure.in then does:
> > > 
> > > case x$glib_size_t in
> > >    x4) typedef guint32 gsize
> > > 
> > > But because ints are 32 bits, guint32 is typedef unsigned int guint32.
> > > So, the resolved typedefs are:
> > > 
> > > typedef unsigned long size_t
> > > typedef unsigned int gsize
> > > 
> > > These are the same size (32 bits), but the compiler notices they are
> > > different types and is very strict in warning.
> > > 	This isn't going to go away unless glib gets a macro to use the
> > > string definition of size_t or something else like that.  I don't see it
> > > happening in the near term.  You can ignore these warnings, or you can
> > > hunt up the right -q option to lower your warning level.
> > 
> > I think we can add a special hack to configure to make sure that gsize
> > and gssize are defined as long if size_t is defined as long, if someone
> > comes up with the appropriate hack.
> 
> why just not:
> typedef size_t gsize;

Well, that works for gsize since it's in stddef.h which is in the one system
header we pull in -- stddef.h. But it doesn't work for gssize / ssize_t
so it doens't really fix the problem.

Regards,
                                        Owen