[Bug ld/18452] ld allows overlapping sections

[andreilupas at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18452

--- Comment #11 from Andrei Lupas <andreilupas at yahoo dot com> ---
(In reply to Alan Modra from comment #7)
> Since there seems to be enough interest in this bug for people to actually
> write patches, here is what I think would work and be accepted:
> 
> In lang_size_sections_1, near the comment "A backwards move of dot", set a
> static global var whenever seeing "dot < last->vma".  This should flag all
> cases where overlays are used without false triggers.
> 
> Modify lang_check_section_addresses to check for vma overlap when no
> overlays are detected.
> - Use IGNORE_SECTION again to choose interesting sections (the attached
> patch was wrong in treatment of .tbss)
> - In the existing lma checking loop, ignore !SEC_LOAD sections.  Some
> rewriting might be necessary to elegantly handle the case of the first
> section being !SEC_LOAD.
> - Write another loop to check vmas if overlays not present

This would be great (would definitely solve my problem; ld scripts I used
didn't use OVERLAY command).

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