Re: [Fwd: [Gstreamer-gstmm] Fix for compile error]

[José Alburquerque <jaalburquerque cox net>]

Milosz Derezynski wrote:
> Hey! Sorry for the late reply!
>
> As for the va_list patch, i'm not sure right now where it's needed (it
> might be needed but i wouldn't know where); where did you encounter a
> problem with it? A compiler warning output would be helpful.
>
> As for the autogen patch, i'm going to commit it.
>
> Milosz
>   

Thanks Milosz.  The compiler error I get (shown in the original e-mail 
below) is the following:

caps.cc: In member function 'void Gst::Caps::simple_valist(char*, const 
__va_list_tag (&)[1])':
caps.cc:151: error: invalid conversion from 'const __va_list_tag*' to 
'__va_list_tag*'
caps.cc:151: error:   initializing argument 3 of 'void 
gst_caps_set_simple_valist(GstCaps*, char*, __va_list_tag*)'
make[5]: *** [caps.lo] Error 1

The relevant code is in "caps.cc" and looks like the following:

void Caps::simple_valist(char* field, const va_list& varargs)
{
gst_caps_set_simple_valist(gobj(), field, varargs);
}

On this system, the compiler is having trouble with the call to 
gst_caps_set_simple_valist(), specifically the "varargs" parameter.  It 
seems that in the "Caps::simple_valist()" prototype it is declared as a 
"const va_list&", but gst_caps_set_simple_valist() expects it to be 
non-constant (see 
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#gst-caps-set-simple-valist).  
Should the compiler not be complaining?  BTW, I'm using gcc-4.2.3 if it 
makes any difference.

-Jose

> 2007/11/13, José Alburquerque <jaalburquerque cox net>:
>   
> > Milosz:
> >
> > I sent the e-mail below to the gstreamer-gstmm list but didn't get an
> > answer so I'm sending it to the gtkmm-list in case the diff I sent might
> > be useful.  Also, I'm attaching another diff (made to the autogen.sh
> > file) that fixes dealing with automake in such a way as to use other
> > versions like 1.10.  Are these diff's useful?
> >
> > -Jose
> >
> > -------- Original Message --------
> > Subject:        [Gstreamer-gstmm] Fix for compile error
> > Date:   Wed, 07 Nov 2007 20:15:59 -0500
> > From:   José Alburquerque <jaalburquerque cox net>
> > To:     Milosz Derezynski <internalerror gmail com>,
> > gstreamer-gstmm lists sourceforge net
> >
> >
> >
> > Hi Milosz.  It took me a while, but I finally began seeing somewhat what
> > I can wrap and I thought I'd start by building what's in svn first.  I
> > did, and I got the following compile error which I think I fixed with
> > the diff I'm sending you:
> >
> > make[5]: Entering directory
> > `/home/jose/Projects/Programming/gstreamermm-devel/gst/gstmm'
> > /bin/sh ../../libtool --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H
> > -DG_LOG_DOMAIN=\"gstmm\"  -I../../gst -I../../gst -pthread
> > -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include
> > -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include
> > -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
> > -I/usr/include/gstreamer-0.10 -I/usr/include/libxml2     -g -O2 -MT
> > caps.lo -MD -MP -MF .deps/caps.Tpo -c -o caps.lo caps.cc
> >  g++ -DHAVE_CONFIG_H -DG_LOG_DOMAIN=\"gstmm\" -I../../gst -I../../gst
> > -pthread -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include
> > -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include
> > -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
> > -I/usr/include/gstreamer-0.10 -I/usr/include/libxml2 -g -O2 -MT caps.lo
> > -MD -MP -MF .deps/caps.Tpo -c caps.cc  -fPIC -DPIC -o .libs/caps.o
> > caps.cc: In member function 'void Gst::Caps::simple_valist(char*, const
> > __va_list_tag (&)[1])':
> > caps.cc:151: error: invalid conversion from 'const __va_list_tag*' to
> > '__va_list_tag*'
> > caps.cc:151: error:   initializing argument 3 of 'void
> > gst_caps_set_simple_valist(GstCaps*, char*, __va_list_tag*)'
> > make[5]: *** [caps.lo] Error 1
> >
> > Do you think this is a good fix?  Thanks.
> >
> > -Jose
> >
> >
> >
> >
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