[Bug ld/18452] ld allows overlapping sections

[amodra at gmail dot com]

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

--- Comment #7 from Alan Modra <amodra at gmail dot com> ---
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

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