[llvm-dev] RFC [ThinLTO]: Promoting more aggressively in order to reduce incremental link time and allow sharing between linkage units

Peter Collingbourne via llvm-dev llvm-dev at lists.llvm.org
Thu Apr 7 11:53:16 PDT 2016

On Thu, Apr 7, 2016 at 11:42 AM, Rafael EspĂ­ndola <
rafael.espindola at gmail.com> wrote:

> > I imagine that for some linkers, it may not be possible to deal with this
> > scheme. For example, I did some investigation last year and discovered
> that
> > I could not use the gold plugin interface to load a native object file
> if we
> > had already claimed it as an IR file. I wouldn't be surprised to learn
> that
> > ld64 has similar problems.
> Can't you just call add_input_file with the original file in addition
> to any .o files you created during linking?

I think that almost worked, but I kept running into issues relating to the
fact that the plugin needed to inform the linker about symbols in the
native object file via add_symbols. What I ended up with was kind of
unsound and still didn't work correctly for (at least) some parts of

I suppose I can try to pull up that work again and go into more detail on
what exactly the issues were, if you're interested.

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