[llvm-dev] MCJIT - missing DataLayout?

[Neil Henning via llvm-dev]

Another approach that we use - we just wipe the DataLayout on the module 
about to be handed to the ExecutionEngine, and in MCJIT.cpp there is a 
line that says 'if datalayout isDefault() (eg. empty string 
representation "") set it to the datalayout of the Target Machine'.

Cheers,

-Neil.

On 05/05/16 13:48, Josh Klontz via llvm-dev wrote:
> Pawel,
>
> Hopefully this provides a partial answer: when using MCJIT I set the 
> data layout for every module. My code looks roughly like:
>
> TargetRegistry::lookupTarget(sys::getProcessTriple())->createTargetMachine()->createDataLayout();
>
> -Josh
>
> On Thu, May 5, 2016 at 5:34 AM, Paweł Bylica <llvm-dev at lists.llvm.org 
> <mailto:llvm-dev at lists.llvm.org>> wrote:
>
>     Hi everyone,
>
>     I was happily using MCJIT for over a year until yesterday when I
>     created a function call with an argument of a struct type. That
>     caused a crash in SelectionDAG around DataLayout::getAlignment().
>
>     I remember the noise about the DataLayout started being mandatory.
>     But I cannot find precise information.
>
>     Should I set the DataLayout in every Module created?
>
>     Where can I get the DataLayout for the host process from?
>
>     Can a DataLayout instance be shared between modules?
>
>     - Paweł
>
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