[llvm-dev] [GPUCC] link against libdevice

[Justin Lebar via llvm-dev]

Hi, Yuanfeng.

What version of clang are you using?  CUDA is only known to work at
tip of head, so you must build clang yourself from source.

I suspect that's your problem, but if building from source doesn't fix
it, please attach the output of compiling with -v.

Regards,
-Justin

On Sun, Jul 31, 2016 at 9:24 PM, Chandler Carruth <chandlerc at google.com> wrote:
> Directly CC-ing some folks who may be able to help.
>
> On Fri, Jul 29, 2016 at 6:27 AM Yuanfeng Peng via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>>
>> Hi,
>>
>> I was trying to compile scalarProd.cu (from CUDA SDK) with the following
>> command:
>>
>>  clang++ -I../ -I/usr/local/cuda-7.0/samples/common/inc
>> --cuda-gpu-arch=sm_50 scalarProd.cu
>>
>>  but ended up with the following error:
>>
>> ptxas fatal   : Unresolved extern function '__nv_mul24'
>>
>> Seems to me that libdevice was not automatically linked.  I wonder what
>> flags I need to pass to clang to have the code linked against libdevice?
>>
>> Thanks!
>> Yuanfeng Peng
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