[Bug 161] GDC prevents backend from removing dead functions

[via D.gnu]

http://bugzilla.gdcproject.org/show_bug.cgi?id=161

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Isn't this what LTO/strip is used for?

Actually, it's mark_needed in d-objfile.cc that forces it's write to objfile. 
It's needed for sure, otherwise phantom linker errors crop up in larger / heavy
templated projects.

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