Enable openacc

[K20shores]

• Adds support for building openacc
• Wraps cuda and openacc code in their own namespaces so that function names can be the same if desired

1. Setup a localrc file

makelocalrc -d . -x -gcc /glade/u/apps/gust/23.04/spack/opt/spack/ncarcompilers/0.8.0/gcc/12.2.0/bin/gcc -gpp /glade/u/apps/gust/23.04/spack/opt/spack/ncarcompilers/0.8.0/gcc/12.2.0/bin/g++ -g77 /glade/u/apps/gust/23.04/spack/opt/spack/ncarcompilers/0.8.0/gcc/12.2.0/bin/gfortran

2. Start a session

qinteractive -A<AccountNumber> --ngpus=1

3. Tell nvidia to use this file.

export NVLOCALRC=/glade/u/home/kshores/localrc

4. Load the modules

module load nvhpc/23.1 cmake/3.25

5. Build micm with open acc

cd micm/build
cmake -DENABLE_OPENACC=ON -DENABLE_REGESSION_TESTS=OFF -D GPU_TYPE="cc80"  ..

6. Run the tests

make test

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c2cbcf2) 92.71% compared to head (12d261d) 92.71%.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           AddForcingTerm_CUDA      #91   +/-   ##
====================================================
  Coverage                92.71%   92.71%           
====================================================
  Files                       17       17           
  Lines                      961      961           
====================================================
  Hits                       891      891           
  Misses                      70       70           

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[sjsprecious]

Thanks @K20shores for making these changes so quickly! This is extremely helpful for our GPU development efforts and I only have a minor suggestion before merging it.