[gmx-users] GPU warnings

[Thomas Evangelidis]

> > gcc 4.7.2 is not supported by any CUDA version.
> >
>
> I suggest that you just fix it by editing the include/host_config.h and
> changing the version check macro (line 82 AFAIK). I've never had real
> problems with using new and officially not supported gcc-s, the version
> check is more of a promise from NVIDIA that "we've tested thoroughly
> internally and we more or less vouch for thins combination".
>
> Cheers,
> --
> Szilárd
>
> PS:
> Disclamer: I don't take responsibility if your machine goes up in flames!
> ;)
>
>
Hi Szilárd,,

I tried to compile gromacs-4.6beta1, is this the version you suggested? If
not, please indicate how to download the source cause I am confused with
all these development versions.

Anyway, this is the error I get with 4.6beta1, gcc 4.7.2 and cuda 5:

[  0%] Building NVCC (Device) object
src/gromacs/gmxlib/cuda_tools/CMakeFiles/cuda_tools.dir//./cuda_tools_generated_cudautils.cu.o
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h(48):
error: identifier "__atomic_fetch_add" is undefined

/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h(52):
error: identifier "__atomic_fetch_add" is undefined

2 errors detected in the compilation of
"/tmp/tmpxft_00002394_00000000-9_cudautils.compute_30.cpp1.ii".
CMake Error at cuda_tools_generated_cudautils.cu.o.cmake:252 (message):
  Error generating file

/home/thomas/Programs/gromacs-4.6-beta1_gnu_cuda5_build/src/gromacs/gmxlib/cuda_tools/CMakeFiles/cuda_tools.dir//./cuda_tools_generated_cudautils.cu.o


gmake[3]: ***
[src/gromacs/gmxlib/cuda_tools/CMakeFiles/cuda_tools.dir/./cuda_tools_generated_cudautils.cu.o]
Error 1
gmake[2]: *** [src/gromacs/gmxlib/cuda_tools/CMakeFiles/cuda_tools.dir/all]
Error 2
gmake[1]: *** [src/programs/mdrun/CMakeFiles/mdrun.dir/rule] Error 2
gmake: *** [mdrun] Error 2


Unless I am missing something, cuda 5 does not support gcc 4.7.2.


 Thomas