[LLVMdev] MC JIT fails on Linux [was: Trouble using the MCJIT: "Target does not support MC emission" error]

[Ralf Karrenberg]

Hi Xerxes, Hi everybody,

can anybody comment on the status of the MC JIT on Linux?
Is there somebody working on this already or does any schedule (e.g. for 
LLVM 3.0) exist?
I guess filing a bug report is not appropriate here since there is no 
implementation...

Best,
Ralf

On 8/31/11 5:23 PM, Xerxes Rånby wrote:
> ons 2011-08-31 klockan 10:51 +0200 skrev Ralf Karrenberg:
>> Hi Matt, hi Bruno,
>>
>> I am still struggling to use AVX via MCJIT on TOT... did you succeed yet?
>>
>> I seem to be unable to even get lli to run some code with the
>> "use-mcjit" flag.
>> I attached a test case that works fine for "lli y.bc" but exits with an
>> error for "lli -use-mcjit y.bc":
>> "LLVM ERROR: Unknown object format"
> When I test the MCJIT under Linux I notice that lli are indeed trying to
> load a buffer that contains an ELF object but fails to verify the format
> using RuntimeDyldMachO::isKnownFormat this of course fails since Linux
> uses ELF instead of Mach-o and this are causing lli to report (unknown
> object format).
>
> We need to implement
> llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
> for the MCJIT to work on ELF systems.
>
> Testcase:
> ./llvm-as<  llvm/test/ExecutionEngine/hello.ll | ./lli -use-mcjit
>
>> Any more ideas?
>>
>> Best,
>> Ralf
> Cheers
> Xerxes
>
>