[llvm-dev] LLJIT vs. thread-local storage

[Praveen Velliengiri via llvm-dev]

Hi Jameson,
Why thread local support is hard to support in JITs? Whether Julia supports
Thread locals? If so, it would be very much helpful to know how.

Thanks

On Fri, 20 Dec 2019 at 23:31, Jameson Nash via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> This had also came up at llvm-devmtg briefly at the JIT roundtable. One of
> the collaborators on my project had started a patch years ago to implement
> some of it https://reviews.llvm.org/D8815, but then we went a different
> direction with TLS in our frontend and it became unnecessary.
>
> On Fri, Dec 20, 2019 at 12:36 PM David Blaikie via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> +Lang for visibility
>>
>> On Fri, Dec 20, 2019 at 5:09 AM Geoff Levner via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> I am in the process of porting our ORC code to ORC v2 and LLJIT. Now
>>> that I have worked around a problem getting global constructors to be
>>> called, everything seems to work unless a module declares a static
>>> thread-local variable. In that case I get a "JIT session error" saying that
>>> the symbol __emutls_v.xyz was not found (substitute the mangled
>>> variable name for "xyz").
>>>
>>> Does that mean anything to anybody out there?
>>>
>>> (I don't know if it's relevant, but we are using LLVM 8, and we are
>>> using Clang to compile C++ modules that are all put into a single JITDylib.)
>>>
>>> Geoff
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
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