[Openmp-dev] Math symbols are not found during configuration

Thu Jul 25 05:23:03 PDT 2019

That is unfortunately not what I was looking for.

Do you have a single source file, preferably small, which showcases the problem? 

________________________________________
From: Itaru Kitayama <itaru.kitayama at gmail.com>
Sent: Thursday, July 25, 2019 07:19
To: Doerfert, Johannes
Cc: openmp-dev at lists.llvm.org
Subject: Re: [Openmp-dev] Math symbols are not found during configuration

$ git clone https://github.com/nest/nest-simulator
$ cmake -DCMAKE_TOOLCHAIN_FILE=Platform/JURON_Clang -DCMAKE_INSTALL_PREFIX=/tmp/nest-clang-offload -Dwith-gsl=OFF -Dwith-openmp=ON -Dwith-mpi=OFF -Dwith-python=OFF -Dwith-offload=ON /path/to/nest-simulator

On Thu, Jul 25, 2019 at 8:49 PM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>> wrote:
Can you share an example of your problem?

________________________________________
From: Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>>
Sent: Thursday, July 25, 2019 06:00
To: Doerfert, Johannes
Cc: Jeff Hammond; openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>
Subject: Re: [Openmp-dev] Math symbols are not found during configuration

The host code is affected with Clang 9 at this moment. I was originally reporting the host code can not be compiled with -fopemp-targets.

On Thu, Jul 25, 2019 at 19:50 Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>> wrote:
Now, and in future releases, host code should not be impacted.

________________________________________
From: Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com><mailto:itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>>>
Sent: Thursday, July 25, 2019 05:28
To: Doerfert, Johannes
Cc: Jeff Hammond; openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>
Subject: Re: [Openmp-dev] Math symbols are not found during configuration

In future releases, is NAN supported at least in host code? It's scattered everywhere in the codebase I am currently working.

On Thu, Jul 25, 2019 at 12:13 PM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>>> wrote:
You are correct, there is a regression but also a major improvement:

Clang 8.0: M_PI  works in host code and NVPTX-device code
Clang 8.0: std::sin etc. works in host code but not NVPTX-device code
Clang 9.0: M_PI works in host code but not in NVPTX-device code
Clang 9.0: std::sin etc. works in host code and NVPTX-device code

So we basically traded in system math declarations that had a valid implementation
for NVPTX-devices, thus no vector intrinsics, inline assembly etc., for specialized math
declarations that are distributed with Clang CUDA (as builtin math functions).

I hope this does not cause too much trouble for you and you can benefit from the
additional support. Know that we are working to get both up and running.

Does this help?

________________________________________
From: Itaru Kitayama <itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com><mailto:itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>><mailto:itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com><mailto:itaru.kitayama at gmail.com<mailto:itaru.kitayama at gmail.com>>>>
Sent: Wednesday, July 24, 2019 19:47
To: Doerfert, Johannes
Cc: Jeff Hammond; openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>>
Subject: Re: [Openmp-dev] Math symbols are not found during configuration

Johannes,
Clang 8.0.0 works without making modifications to the source code, thus I am confused as to
what needs to be done.

On Thu, Jul 25, 2019 at 5:32 AM Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>>>> wrote:
#define works, the preprocessor works.

When the target region is compiled we do not include math.h. This will
change once we get support for variants. Till then, it is either no math
functions or only he ones Clang CUDA provides automatically, which seems
not to include these defines, maybe because they are not ISO C but POSIX
extensions.

On 07/24, Jeff Hammond wrote:
> How does #define not act on the full source code? How is that a compliant implementation of the preprocessor?
>
> Jeff
>
> > On Jul 24, 2019, at 12:25 PM, Doerfert, Johannes via Openmp-dev <openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>>>> wrote:
> >
> > Hi Itaru,
> >
> > For now, you need to define them yourself when you need them in the target region.
> > We are working on a permanent solution.
> >
> > Thanks,
> >  Johannes
> >
> > ________________________________________
> > From: Openmp-dev <openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org>><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org>>><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org>><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org><mailto:openmp-dev-bounces at lists.llvm.org<mailto:openmp-dev-bounces at lists.llvm.org>>>>> on behalf of Itaru Kitayama via Openmp-dev <openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>>>>
> > Sent: Tuesday, July 23, 2019 22:58
> > To: openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org><mailto:openmp-dev at lists.llvm.org<mailto:openmp-dev at lists.llvm.org>>>>
> > Subject: [Openmp-dev] Math symbols are not found during configuration
> >
> > Hi,
> > Adding the flag -fopenmp-targets=nvptx64 makes math symbols M_E and M_PI defined in cmath not detected during the execution of CMake. How do I work around this? I am using the latest trunk Clang at this moment, and without the above flag, both symbols are detected properly.
> >
> > Thanks,
> > Itaru.
> > _______________________________________________
> > Openmp-dev mailing list
> > Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org>><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org>>><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org>><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org><mailto:Openmp-dev at lists.llvm.org<mailto:Openmp-dev at lists.llvm.org>>>>
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev

--

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov><mailto:jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>>>>