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Re: [Gm2] linking : `__gxx_personality_v0' question

From: Gaius Mulley
Subject: Re: [Gm2] linking : `__gxx_personality_v0' question
Date: Tue, 19 Apr 2011 12:21:56 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

Arnauld Michelizza <address@hidden> writes:

> Hi Gaius,
> thank you very much for your quick reply.
>> you could try:
>> gm2 -c -m32 -fno-exceptions Kernel.mod
> I already tried this, but curiously, that __gxx_personality_v0 symbol remains 
> :
> $ gm2 -c -m32 -fno-exceptions Kernel.mod
> $ nm Kernel.o
> 00000000 b MyScreen
> 0000008a t PutCharOnXY
> 00000085 T _M2_Kernel_finish
> 00000000 T _M2_Kernel_init
>          U __gxx_personality_v0
> $ gm2 --version
> GNU Modula-2  1.0.1  (20110223)
>   grafted onto GCC 4.1.2
>> and then the link.  C++ (libstdc++) is used to handle Modula-2
>> exceptions (which you probably don't want in your kernel).  Some
>> embedded ports cannot use libstdc++ either so this option disables this
>> library.
> Ok, it's very clear.
> Option -fno-exceptions doesn't seem to work. Maybe a gm2 or gcc
> version problem ?

Hi Arnauld,

here is a command line I use for an embedded target.

avr-gm2 -mmcu=atmega8 -g -Os -fno-exceptions -O2 flashled.mod \
 -flibs=min -o flashled.elf

However I suspect the reason for the __gxx_personality_v0 is that the
libraries have been built without the -fno-exceptions option.

I'll rerelease gm2 with minlibs built in this way (for a native gm2).
This is a trivial rebuild.

However a better solution will probably require a little more thought to
allow core functionality (basic string, input output libraries to be
built without exceptions).


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