Re: A very "strange" bug in gcc 2.96

["H . J . Lu" <hjl at lucon dot org>]

On Mon, May 22, 2000 at 02:35:02PM +1000, Alan Modra wrote:
> On Sun, 21 May 2000, H . J . Lu wrote:
> 
> > > For x86, gas/config/tc-i386.c:md_estimate_size_before_relax needs to be
> > > taught how to handle this case properly.  (I think that's all that's
> > > needed...)
> > 
> > That is only ia32. What about others?
> 
> If what I understand about this problem is correct, then it's caused by a
> feature in the x86 assembler, namely that jumps are emitted using the
> smallest possible opcode that the assembler "knows" it can use.  If jumps
> aren't treated specially on other gas architectures then there shouldn't
> be a problem.
> 
> x86 gas currently assumes that if a jump target is within the same
> segment, then it is OK to consider using a small jump, and that a reloc
> isn't needed.  That assumption breaks badly now that gcc might be emitting
> jumps to weak symbols.
> 

Assume it is correct, do you have a patch I can try?


H.J.