[En-Nut-Discussion] C++ compiling problem with virtual methods(aligment of 'x' is greater than maximum object file aligment)

[Gervasio Varela]

Thanks to all of you, I will post the question on the AVR-GCC list by now.
I'll tell you their responses ;).

On 23/02/07, Ernst Stippl <ernst at stippl.org> wrote:
>
> Hi!
>
> Try to post you questions also at avr-gcc-list at nongnu.org as this is the
> avr
> gcc forum. The people there are  very knowledgable!
> regards
> ernst
>
> -----Ursprüngliche Nachricht-----
> Von: en-nut-discussion-bounces at egnite.de
> [mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von Gervasio
> Varela
> Gesendet: Donnerstag, 22. Februar 2007 22:15
> An: ethernut at stockelache.de; Ethernut User Chat (English)
> Betreff: Re: [En-Nut-Discussion] C++ compiling problem with virtual
> methods(aligment of 'x' is greater than maximum object file aligment)
>
> Hi Matthias,
>
>
> welcome to the club of C++ programmers on Ethernut.
> > Since I do not have v1 Charon board I can not say what is going wrong.
> > However regarding Ethernut 3 (arm) I did some adaptation and so far as
> > I know PURE virtual functions are not supported in current version.
>
>
> After an afternoon of tests, I have come to the conclusion that in AVR-GCC
> pure virtual functions aren't supported neither :).
>
> However
> > I remember I had some problems also with virtual functions, but when I
> > remember right that was during linking.
> >
> I guess with some modifications in the makefiles (compiler / linker flags)
> > it should be possible.
>
>
> Yes, at last I managed to find the file with the avr-g++ flags defintions
> and I removed the '-Wall -Werrror' in order to achieve that the
> compilation
> process doesn't get stoped by those warnings.
>
> Now the program compiles and links well (but the warnings continue there),
> and even runs well! :) (virtual functions are running ok)
>
> My primary concerns were about the size of the resulting program (I'm
> implementing a sort of remote object system for little embedded systems),
> but it seems to scale well, even for the 128K ROM of the Charon2 :D.
>
> OK - not at all very helpful my words - just a comment.
>
>
> Thank you very much Matthias.
>
> Finally, some of my first impresions testing C++ with AVR-GCC, to see if
> some are incorrent (I have little experience with C++) and somebody knowns
> a
> tip about it:
>
> - You can't use PURE virtual functions
> - You can't use new or delete with arrays (ex: SomeObject * foo = new
> SomeObject[len]; delete [] foo), use malloc and free instead?
>
> Best regards.
>
>
> --
> ###################################
> #    Gervasio Varela                               #
> #    gervarela at picandocodigo.com         #
> #    http://www.picandocodigo.com          #
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#    Gervasio Varela                               #
#    gervarela at picandocodigo.com         #
#    http://www.picandocodigo.com          #
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