[Bug ld/21448] References to constant data in shared libraries bloats 2.28 executables compared to 2.27

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21448

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
Shared library code is affected, losing an optimization for protected
visibility variables, but the reason you see a .dynbss/.data.rel.ro copy of
shared lib variables and copy relocs is code in the *executable*.

Yes, we could use an extra PT_LOAD in the middle of the relro area but not
quite as you say.  The linker generated .data.rel.ro would be put into memsz of
the first PT_LOAD, with the remainder of relro and other sections in the
second.  There would be some disk wasted due to needing to keep vma mod maxpage
equal to offset mod maxpage.  I haven't looked at whether this would require
changes to glibc ld.so.

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