[llvm-dev] [GPUCC] link against libdevice

[Yuanfeng Peng via llvm-dev]

Hi Justin,

Thanks for your response!  The clang & llvm I'm using was built from
source.

Below is the output of compiling with -v.  Any suggestions would be
appreciated!

*clang version 3.9.0 (trunk 270145) (llvm/trunk 270133)*
*Target: x86_64-unknown-linux-gnu*
*Thread model: posix*
*InstalledDir: /usr/local/bin*
*Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8*
*Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4*
*Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9*
*Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3*
*Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8*
*Candidate multilib: .;@m64*
*Candidate multilib: 32;@m32*
*Candidate multilib: x32;@mx32*
*Selected multilib: .;@m64*
*Found CUDA installation: /usr/local/cuda*
* "/usr/local/bin/clang-3.9" -cc1 -triple nvptx64-nvidia-cuda -aux-triple
x86_64-unknown-linux-gnu -S -disable-free -main-file-name scalarProd.cu
-mrelocation-model static -mthread-model posix -mdisable-fp-elim
-fmath-errno -no-integrated-as -fcuda-is-device -target-cpu sm_50 -v
-dwarf-column-info -debugger-tuning=gdb -resource-dir
/usr/local/bin/../lib/clang/3.9.0 -I ../ -I
/usr/local/cuda-7.0/samples/common/inc -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/local/bin/../lib/clang/3.9.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward
-internal-isystem /usr/local/cuda/include -include
__clang_cuda_runtime_wrapper.h -fdeprecated-macro -fno-dwarf-directory-asm
-fdebug-compilation-dir
/mnt/wtf/workspace/cuda/gpu-race-detection/cuda-compressed-conflict-detection/scalarProd
-ferror-limit 19 -fmessage-length 144 -fobjc-runtime=gcc -fcxx-exceptions
-fexceptions -fdiagnostics-show-option -o /tmp/scalarProd-32a530.s -x cuda
scalarProd.cu*
*hooklib.so loading.*
*clang -cc1 version 3.9.0 based upon LLVM 3.9.0svn default target
x86_64-unknown-linux-gnu*
*ignoring nonexistent directory "/include"*
*ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8"*
*ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8"*
*ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8"*
*ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8"*
*ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward"*
*ignoring duplicate directory "/usr/local/include"*
*ignoring duplicate directory "/usr/local/bin/../lib/clang/3.9.0/include"*
*ignoring duplicate directory "/usr/include"*
*#include "..." search starts here:*
*#include <...> search starts here:*
* ..*
* /usr/local/cuda-7.0/samples/common/inc*
* /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8*
* /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8*
* /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward*
* /usr/local/include*
* /usr/local/bin/../lib/clang/3.9.0/include*
* /usr/include*
* /usr/local/cuda/include*
*End of search list.*

* "/usr/local/cuda/bin/ptxas" -m64 -O0 --gpu-name sm_50 --output-file
/tmp/scalarProd-181f7e.o /tmp/scalarProd-32a530.s*
*ptxas fatal   : Unresolved extern function '__nv_mul24'*
*clang-3.9: error: ptxas command failed with exit code 255 (use -v to see
invocation)*

Thanks!
Yuanfeng

On Mon, Aug 1, 2016 at 1:04 AM, Justin Lebar <jlebar at google.com> wrote:

> 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
> >> _______________________________________________
> >> LLVM Developers mailing list
> >> llvm-dev at lists.llvm.org
> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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