Re: Building mozart-gtk on powerpc [request for help]
Thanks for your advice, in the meantime I have taken a sledgehammer
to the problem and just removed the troublesome functions from the
interface. As far as I can tell noone will miss them.
regards
Kevin
NB. The package is an interface from Oz (www.mozart-oz.org) to the gtk
library. The interface is generated automatically from gtk header
files.
Albert Cahalan writes:
> On Wed, 2004-08-25 at 07:52, Kevin Glynn wrote:
> > Daniel Kobras writes:
> > > On Tue, Aug 24, 2004 at 06:21:57PM +0200, Kevin Glynn wrote:
> > > > fyi, it is because va_list is declared as a one-element array of
> > > > structs on powerpc, unlike other architectures so code like:
> > > >
> > > > va_list Arg4 = (va_list) OZ_getForeignPointer((*(_OZ_LOC[(4)])));
> > > >
> > > > fails on powerpc, because you can't cast to an array.
> > >
> > > And you may not assign to a va_list. Use va_copy() instead to be
> > > portable.
> > >
> > > Daniel.
> > >
> >
> > I don't see how va_copy will help me. OZ_getForeignPointer(...)
> > returns a void*, so I will still need to cast it to a va_list to be
> > able to call va_copy. Here is my test program, perhaps you can suggest
> > an alternative:
>
> Due to some disgusting changes in the C standard,
> casting from (void*) is pretty much illegal anyway.
> I expect that C++ is affected as well. It has to
> do with pointer aliasing.
>
> Use a union. Put all the types you need into the
> union. So you'd use a pointer to a union, and skip
> the casting.
>
> Use the -Wstrict-aliasing=2 compiler option.
>
> I use:
>
> -W -Wall -Wshadow -Wcast-align -Wredundant-decls \
> -Wbad-function-cast -Wcast-qual -Wwrite-strings -Waggregate-return \
> -Wstrict-prototypes -Wmissing-prototypes \
> -Wdeclaration-after-statement -Wpadded -Wstrict-aliasing=2
>
> (those last 3 depending on a recent gcc)
>
>
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