Re: Is this a bug in GNU ld?

[Wolfram Gloger <wmglo at dent dot med dot uni-muenchen dot de>]

[wrong code generated on mips]

> 688 is the offset from the beginning of the caller to the beginning of the 
> callee (they're in the same file).  Presumably, then, ld will change the lw 
> into $t9 to load the address of the caller.  What actually gets generated, 
> though, is
> 
>     cd28:       8f99801c        lw      $t9,-32740($gp)
>     cd2c:       00000000        nop
>     cd30:       2739cf90        addiu   $t9,$t9,-12400
>     cd34:       00000000        nop
>     cd38:       0320f809        jalr    $t9
> 
> The offset -32740 points to an uninitialized memory location, and -12400 
> would be the offset to the callee from the start of the text section if it 
> weren't sign-extended.
> 
> I'm running Redhat 6.0, gcc version egcs-2.90.29 980515 (egcs-1.0.3 
> release), and binutils version 2.8.1 (mips-linux), using BFD version 2.8.1.

Some months ago I was looking at random crashes on mips-irix6 that
could be tracked down to instructions just like the above.  That only
happened when compiling with optimization, though, and at the time I
was using egcs-1.1.

So I would encourage you to try to turn off optimization, or even
better to upgrade to gcc-2.95.2 (my problem was fixed in gcc-2.95).

Regards,
Wolfram.