Re: [avr-gcc-list] using exceptions

[Georg-Johann Lay]

Gabriel Dos Reis schrieb:
> Georg-Johann Lay wrote:
> > Kövesdi György schrieb:
> >
> > > I am using avr-g++ for building my projects for avr and i am
> > > happy with it. :-)
> > > But i would need exception support, and could not find how to
> > > get it work. I found some mails in the archive (dated many
> > > years ago) about possibilityof building libstdc++ or libsupc++
> > > with exception support, but could not find how to do it.
> > > Reportedly it uses 10...20 kbytes of text, which would be acceptable.
> > >
> > > Currently i have gcc 4.6.2 sources, and have tried the options
> > > --enable-sjlj-exceptions,
> > > --with-exceptions, --with-rtti, --enable-libstdc++, etc... no one helped.
> >
> > libstdc++ is turned off in configury, for example configure.ac reads
> >
> > # Disable libstdc++-v3 for some systems.
> > case "${target}" in
> > [...]
> > avr-*-*)
> >   noconfigdirs="$noconfigdirs target-libstdc++-v3"
> >   ;;
> > esac
> >
> > This is current trunk. There were some changes not very long ago.
>
> Would it be reasonable to expect at least libsupc++?
> That would be a useful start...

IMHO extending what avr-gcc/avr-g++ can do is reasonable and
appreciated.

However, avr notoriously is short of developers, and if some
problems pop up, there is nobody who would fix it.

For example, PR50925 could block a build, or it might be the
case that unwinding does not work properly.

I am not familiar with C++, it's a dreaded language I always
avoided.  If I need to operate on a "big" system, I use Java
or Python, and I am in the happy situation not to have to
program big GUIs that base on C++.

Presumably, exception/unwind support could be made much more
efficient with avr-specific unwind info, but obviously
noone ever tried to get it to work.

Johann