Re: How do linkers deal with C++ duplicate code?

On 20 Aug 1998 14:10:17 -0400, John R Levine <johnl@iecc.com> wrote:
>-- Templates and extern inline.


Right - and remember the static copies of inlined functions (in case
someone somewhere else calls one indirect) and the generated default
constructors, copy constructors and assignment operators. And the
vtbl.


> But some systems actually identify and discard the duplicates.


I seem to recall hearing about some work (maybe based on Davidson's
work at Virginia) that kept the compiler output as RTL, then did
interprocedural optimizations on the RTL at link time and tossed out
redundant code blocks there. But it may all have been in a dream ...


Most systems make you do it explicitly, as you know. You tell it when
to generate out the template instantiations. This sucks the big one.


Dwight
--

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