Alternative approach: self-compiled MPICH

Author: franzpoeschel

.github/ci/spack-envs/gcc13_py312_mpich_h5_ad2/spack.yaml

@@ -22,8 +22,8 @@ spack:
       variants: +mpi
     mpich:
       externals:
-      - spec: mpich@4.2.0
-        prefix: /usr
+      - spec: mpich@4.2.1
+        prefix: /usr/local
       buildable: False
     perl:
       externals:

.github/workflows/linux.yml

@@ -172,8 +172,20 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get remove openmpi* libopenmpi* *hdf5* || true
-        sudo apt-get install g++ gfortran libmpich-dev mpich python3
+        sudo apt-get install g++ gfortran python3
         sudo .github/workflows/dependencies/install_spack
+
+        pushd /opt
+        sudo wget -q -nc --no-check-certificate https://www.mpich.org/static/downloads/4.21/mpich-4.21.tar.gz
+        sudo tar -xzf mpich-4.21.tar.gz
+        cd mpich-4.21
+        sudo ./configure --prefix=/usr/local
+        sudo make -j 4
+        sudo make -j 4 install
+        cd ..
+        sudo rm -rf mpich-4.21 mpich-4.21.tar.gz
+        popd
+
     - name: Build
       env: {CC: gcc, CXX: g++, MPICH_CC: gcc, MPICH_CXX: g++, CXXFLAGS: -Werror}
       run: |