Re: [patch,testsuite] Support dg-require-effective-target label_offsets.

[Georg-Johann Lay <avr@gjlay.de>]

On 27.10.2016 12:49, Bernd Schmidt wrote:
> On 10/27/2016 12:16 PM, Georg-Johann Lay wrote:
>> Now imagine some arithmetic like &&LAB2 - &&LAB1.  This might result in
>> one or two stub addresses, and difference between such addresses is a
>> complete different thing than the difference between the original
>> labels:  The result might differ in absolute value and in sign, i.e. you
>> can't even determine whether LAB1 or LAB2 comes first in the generated
>> code as the order of stubs might differ from the order of respective
>> labels.
>
> Ok, so you can't expect to use the value directly, but I think this is not too
> different from other targets. You still should be able to add the difference
> back to &&LAB1 and expect to get &&LAB2 or gs(&&LAB2). That's what the
> execution test does - why isn't this working?
>
> Bernd

Makes sense what you are writing...  Just replacing a label should not do any 
harm (except for ordering).  I had a deeper look into it and some tests are 
failing because of a missing Binutils support for special expressions, not 
because the tests don't work per se.  Patching the generated asm to results as 
would be provided by working Binutils make the test pass.

Johann