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PoCL is used to provide OpenCL on IBM AC922 computers
featuring IBM Power9 processors and Nvidia Tesla V100 GPU
interconnected with NVlink v2 (up to 72 GByte/s).
This has been tested under debian_11 and Ubuntu_20.04.
Officially, Nvidia does not support OpenCL on this platform
and the driver they are shipping is lacking the compiler part.
## Building tricks (as of 04/2023):
The PPC64le features 128-bit vector unit (Altivec/VSX) which
are easily confused by the C++ compiler with the C++ vector
instruction when using the compile option `-std=c++XX`.
The corresponding code usually fails compiling.
The trick is to pass the option `-std=gnu++XX`.
For example, when configuring pocl:
```
cmake .. -DLLVM_CXXFLAGS="-std=gnu++14 ..." -DENABLE_CUDA=ON
```
The full list of options for the CXXFLAGS is obtained with:
```
llvm-config --cxxflags|sed -e "s/std=c/std=gnu/"
```
Later on, the build continues with `make` ...
Note the CUDA option to enable the GPU support on those computers.
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