undefined reference when mixing a.out and ELF object files ?

[Vincent Rivière]

Hello.

I'm experiencing a problem with ld when mixing a.out and ELF object 
files (CPU is m68k). I need to make further investigation in order to 
make a precise bug report, bug maybe someone may know something about 
this problem. I use binutils 2.18.

The problem is something like this.
a.o is an ELF object file containing an undefined symbol
b.o is an a.out object file defining the symbol.

If the ld output format is ELF, the link success.
If the ld output format is a.out or "binary", the link fails with 
"undefined reference".

If I convert b.o to ELF using objcopy, the link succeed in every case.

That sounds like a bug... or maybe I'm trying to make an unsupported mix?

Do someone have an idea about this ?
Or any idea of how to fix it ?

Regards,

-- 
Vincent Rivière