[Bug ld/18452] ld allows overlapping sections

[amodra at gmail dot com]

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

--- Comment #16 from Alan Modra <amodra at gmail dot com> ---
As I was reminded in private email, the patch does not in fact fix the
testcase.  I'd still like to detect overlays automatically, even ones not using
the syntactic sugar of the OVERLAY keyword.  So...  Perhaps it is reasonably to
detect overlays when the current section vma exactly matches the previous
section vma.  That's what you get when using OVERLAY, and the example of
overlays without using OVERLAY in ld.texinfo also starts each overlay section
at the same address.

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