[LLVMdev] lli unable to resolve symbol _ZNKSt3__16locale9use_facetERNS0_2idE in bitcode

[Duncan Sands]

Hi Nick,

> Fundamentally the issue is that the system linker is supposed to define
> __dso_handle when linking, but since there is no system linker between
> your build of the .bc files and running lli, nobody has defined it.
>
> It seems reasonable to me that lli should define __dso_handle if it's
> declared in the module.
>
> You could module tools/lli/lli.cpp to add a global:
>
>     char *dummy_dso_handle = 0;
>
> and tie it to __dso_handle via.
>
>     if (GlobalVariable *DSO = Mod->getGlobalVariable("__dso_handle"))
>       if (!DSO->hasInitializer())
>         EE->updateGlobalMapping(DSO,&dummy_dso_handle);
>
> somewhere in main(), say after disabling lazy compilation. Entirely
> untested though; we might need to give dummy_dso_handle a real value.

this is already done in JIT.cpp, search for HAVE___DSO_HANDLE.  Probably
the interpreter and MCJIT just need to get the same logic.

Ciao, Duncan.

>
> Nick
>
>> tia
>>
>> On 5/21/2012 2:46 PM, Ashok Nalkund wrote:
>>> On 5/21/2012 11:15 AM, Nick Lewycky wrote:
>>>> Ashok Nalkund wrote:
>>>>> Resending, any pointers? I demangled the symbol and it turns out to be:
>>>>> std::__1::locale::use_facet(std::__1::locale::id&) const
>>>>
>>>> My guess is that you've got a .bc file produced on a mac using libc++
>>>> (hence the ::_1 part) and you're trying to run it on linux with
>>>> libstdc++ (which doesn't use inline namespaces, the '::_1::' part). That
>>>> won't work.
>>>>
>>>> Nick
>>>
>>> Thanks for the clue. I had earlier tried to use libc++ and there were
>>> some remnants of that try. I've now cleaned up and now it gets past the
>>> use_facet error.
>>>
>>> It now complains about '__dso_handle'. I saw a bug already reported but
>>> its status is still NEW:
>>> http://llvm.org/bugs/show_bug.cgi?id=7847
>>>
>>> As mentioned in the bug, the problem seems to be when the interpreter is
>>> used.
>>>
>>> There is another post on cfe-dev list:
>>> http://clang-developers.42468.n3.nabble.com/Configuring-HAVE-DSO-HANDLE-by-CMake-td3423707.html
>>>
>>>
>>> Any thoughts?
>>>
>>> thanks
>>> ashok
>>> _______________________________________________
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>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
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>>
>
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