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Re: [avr-gcc-list] using exceptions

From: Georg-Johann Lay
Subject: Re: [avr-gcc-list] using exceptions
Date: Sun, 29 Apr 2012 01:07:22 +0200
User-agent: Mozilla Thunderbird 1.0.7 (Windows/20050923)

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 

Currently i have gcc 4.6.2 sources, and have tried the options 
--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 "${target}" in
    noconfigdirs="$noconfigdirs target-libstdc++-v3"

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


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