Re: [avr-gcc-list] using exceptions

[Georg-Johann Lay]

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 possibility of
> 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.
Anyway, you may want to use something like

$ grep -lr avr .

to find and inspect all the places where avr-configury is special.

If you get it to build, I'd recomment that you run the C++ testsuite
to ensure that you got a reasonably working library that is not
completely useless because, e.g. of missing support in the avr backend.

As C++ is not completely functional for avr, I don't know if there is
anything missing in the avr backend like for exceptions, unwind, etc.
and if the compiler is fit enough to build llibstdc++.

For questions in that field the address@hidden mailing list is
a better place than here...

Good luck

Johann