[LLVMdev] Does LLVM 3.5 works with IR from LLVM 3.0?

[Sean Silva]

On Tue, Jul 15, 2014 at 9:07 AM, Renato Golin <renato.golin at linaro.org>
wrote:

> On 15 July 2014 15:46, John Criswell <jtcriswel at gmail.com> wrote:
> > I believe LLVM 3.5 is supposed to be able to read bitcode files from LLVM
> > 3.0.
>
> Not having tests for that makes it really hard to be sure it works,
> and we didn't particularly kept it as a design goal throughout
> development since then.
>

Yeah, we have a thread floating around ("Clarification on the backward
compatibility promises") where we're trying to even decide on what our
official compatibility promise is.

-- Sean Silva


>
> Things like how unions and structures are represented and marshaled,
> how functions are called (PCS) and more drastically debug metadata
> have changed so much that it'd be near impossible to read any
> reasonably sized 3.0 IR with the current tools.
>
> cheers,
> --renato
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