[PATCH] D32173: [ELF] - Assign absolute values in linkerscript correctly #1.

[George Rimar via Phabricator via llvm-commits]

grimar added a comment.

In https://reviews.llvm.org/D32173#736295, @ruiu wrote:

> Sorry for the delay. I was on vacation last week.
>
> So, this patch allows you compute absolute symbols addresses lazily. With that,  you can create cycles like this.
>
>   foo = ABSOLUTE(bar - 0xff);
>   bar = ABSOLUTE(foo - 0xff);
>   
>
> What do you think it should be handled?
>
> Also, you can create not a cycle but a series of expressions that should be calculated backwards, like this.
>
>   foo = ABSOLUTE(bar);
>   bar = ABSOLUTE(baz);
>   baz = 0xff;
>   
>
> What do you think about this?


Honestly I think I like idea to calculate something absolute for symbol which section did not 
get VA assigned yet at all. And I dont like idea to evaluate something lazily too. 
I just don't sure how to handle such situations properly, thats why prepared 2 different patches
with approaches I can imagine.

May be we just should produce an error in such cases ? That will be inconsistent behavior
with GNU linkers, but simplifies things.


https://reviews.llvm.org/D32173