[llvm-dev] [RFC] Support embedding bitcodes in LLD with LTO

Rui Ueyama via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 30 11:18:07 PST 2019

Hi Josef,

Let me clarify my understanding. Do you want to keep original bitcode files
in the output executable when doing LTO, so that the resulting executable
contains both compiled bitcode (which is in native machine instructions)
and original bitcode files?

Did you try embedding bitcode files into existing ELF files using objcopy
or linker option `--format=binary`?

On Mon, Jan 28, 2019 at 6:41 AM Josef Eisl via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi everybody!
> I'm Josef and I'm working at Oracle Labs on Sulong [1,2], the LLVM IR
> execution engine in GraalVM [3]. In addition to executing bare bitcode
> files, Sulong also accepts ELF files with embedded bitcode sections.
> Therefore, it would be great if LLD in (Full)LTO mode would support
> embedding bitcode sections to the resulting object file. Is that
> something that would be considered useful and worth contributing?
> Thanks,
> Josef
> [1] http://lists.llvm.org/pipermail/llvm-dev/2016-January/094713.html
> [2] https://github.com/oracle/graal/tree/master/sulong
> [3] https://www.graalvm.org/
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