Fix include of OpenMP (#814)

Disable usage of OpenMP with AppleClang as there is a problem on new macos

Author: Nicolas Cornu

.github/workflows/coreneuron-ci.yml

@@ -112,20 +112,22 @@ jobs:
               export CXX="g++-${GCC_VERSION}" CC="gcc-${GCC_VERSION}";
           fi
           
+          openmp=" -DCORENRN_ENABLE_OPENMP=ON"
           if [[ "${{ startsWith(matrix.os, 'macOS') }}" = "true" ]]; then
               export PATH=/usr/local/opt/flex/bin:/usr/local/opt/bison/bin:$PATH;
               export CXX=g++;
               export CC=gcc;
+              openmp=" -DCORENRN_ENABLE_OPENMP=OFF";
           fi
           
           echo "------- Build, Test and Install -------"
           mkdir build && cd build
           if [[ "$USE_ISPC" == "ON" ]]; then
-              cmake -DCORENRN_ENABLE_ISPC=ON -DCMAKE_ISPC_COMPILER=${{runner.workspace}}/ispc/bin/ispc -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
+              cmake ${openmp} -DCORENRN_ENABLE_ISPC=ON -DCMAKE_ISPC_COMPILER=${{runner.workspace}}/ispc/bin/ispc -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
           elif [[ "$USE_NMODL" == "ON" ]]; then
-              cmake -DCORENRN_ENABLE_NMODL=ON -DCORENRN_NMODL_FLAGS="sympy --analytic" -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
+              cmake ${openmp} -DCORENRN_ENABLE_NMODL=ON -DCORENRN_NMODL_FLAGS="sympy --analytic" -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
           else
-              cmake ${cmake_option} -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
+              cmake ${cmake_option} ${openmp} -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR -DPYTHON_EXECUTABLE=$(which python3) ..;
           fi
           make
           ctest --output-on-failure

.github/workflows/test-as-submodule.yml

@@ -97,6 +97,10 @@ jobs:
           cd build
           # NEURON CMake assumes this is defined.
           export SHELL=$(command -v bash)
+          openMP=" -DCORENRN_ENABLE_OPENMP=ON"
+          if [[ "${{ startsWith(matrix.os, 'macOS') }}" = "true" ]]; then
+            openMP=" -DCORENRN_ENABLE_OPENMP=OFF"
+          fi
           cmake .. -G Ninja \
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
             -DCMAKE_INSTALL_PREFIX=../install \
@@ -105,7 +109,7 @@ jobs:
             -DNRN_ENABLE_INTERVIEWS=OFF \
             -DNRN_ENABLE_RX3D=OFF \
             -DNRN_ENABLE_MPI_DYNAMIC=ON \
-            -DNRN_ENABLE_TESTS=ON
+            -DNRN_ENABLE_TESTS=ON ${openMP}
 
       - name: Build NEURON
         run: |