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Add workaround for wrong gcc version on polaris #29

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Add workaround for wrong gcc version on polaris #29

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28 changes: 26 additions & 2 deletions sphinx_docs/source/alcf.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,6 @@ Load the modules:
.. prompt:: bash

module swap PrgEnv-nvhpc PrgEnv-gnu
# load gcc/11.2.0 version since CUDA doesn't support gcc 12 yet
module load gcc/11.2.0
module load nvhpc-mixed

Then you can compile via:
Expand All @@ -39,6 +37,32 @@ Then you can compile via:
make COMP=gnu USE_CUDA=TRUE


Workaround for ``GCC < 8 not supported.``
-----------------------------------------

Since the update on 2024-04-22 (https://docs.alcf.anl.gov/polaris/system-updates/#2024-04-22), ``gcc --version`` returns 7.5.0, which is the default system version.
Loading the ``gcc-native`` module doesn't change this, as the newer compiler versions are located at ``/usr/bin/gcc-12`` and ``/usr/bin/g++-12``, rather than under a versioned subdirectory.
To work around this until the ALCF folks fix it, we can override the CC and CXX variables passed to make:

* For CPU builds without MPI (e.g. plotfile diagnostics):

.. prompt:: bash

make CC=gcc-12 CXX=g++-12 COMP=gnu

* For CPU builds with MPI:

.. prompt:: bash

make CC=cc CXX=CC COMP=gnu USE_MPI=TRUE

* For GPU builds with MPI:

.. prompt:: bash

make NVCC_CCBIN=g++-12 COMP=gnu USE_MPI=TRUE USE_CUDA=TRUE


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