[llvm-dev] [RFC] Support embedding bitcodes in LLD with LTO (original) (raw)

Rui Ueyama via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 30 11🔞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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