> > Yep, c++ vs. c linkage e.g. Therefore the symbols are different even if the
> > source is the same !
> > Doesn't helped my suggestion from "Re: [rtl] Using C++ in rtlinux" 29.01.01 ???
> > What do you get for error messages on loading the module.
>
> Sorry that it took us so long to prepare a response to Herman Bruyninckx.
> We did not manage to check your suggestion when we send it.
If you are in the rtl-mailing list these should be distributed.
> We look upon this problem as a compiler bug and wanted some more persons to see this,
> especially the GNU compiler writers ...
> Your suggestion (-O0) works.
> We also tried -O2 and a reference to "__module_kernel_version" in our code,
Do I misunderstand you ? Why do you refer to this symbol. It's build/imported
by module.h and used by kernel module loader. Imo there is no other use on it.
> but, although the kernel version string appears in the object file, it did not work
>and
> compiling that file with -O0 resulted in th double occurrence of the string in the
>.o file!
You have to define __NO_VERSION__ on all other sources/headers else you will
get multiple symbols if you include linux/module.h ! May suggestion is to use
one c file and compile it as usually as c source -> obj file and link it to the
other c++ obj files, compiled with __NO_VERSION__ (defined in source or header
each time) with -O{1-3}
> Since we do not want to compile all our code with -O0, we have to "combine" a number
> of object files. We tried ld -Ur -o out.o a.o b.o ... but we got unresolved name
>errors from
It's the common way. No idea what is -Ur at moment. I use:
$(LD) -m elf_i386 -static -r -o mymod.o $(CRTBEGIN) $(rmymod_OBJECTS) $(CRTEND)
> insmod. What would be the correct way to do this?
What for symbols by name ? There are some articles concerning c++ && kernel/rtl
in the mailing list archive. Even you have to compile without exception
handling and rtti.
Regards
Olaf
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