From 82354997d70e6870fa80fb2b89bd96b74ae458e4 Mon Sep 17 00:00:00 2001
From: Cameron Smith <cwsmith@users.noreply.github.com>
Date: Tue, 13 Feb 2024 16:21:43 -0500
Subject: [PATCH] add mpi testing to github actions (#85)

adds mpi to the matrix of build options
---
 .github/workflows/cmake.yml | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 8ed3d04ce..51055e631 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -11,12 +11,17 @@ jobs:
     strategy:
       matrix:
         compiler: [g++, clang++]
+        mpi: [on, off]
         kokkos: [on, off]
         mempool: [on, off]
         exclude:
         - kokkos: off
           mempool: on
 
+    env:
+      CXX: ${{matrix.compiler}}
+      MPICH_CXX: ${{matrix.compiler}}
+
     steps:
     - uses: actions/checkout@v4
       with:
@@ -28,6 +33,17 @@ jobs:
         repository: kokkos/kokkos
         path: kokkos
 
+    - name: install mpich
+      if: ${{ matrix.mpi == 'on' }}
+      run: |
+           sudo apt update
+           sudo apt install mpich
+
+    - name: set mpi compiler wrapper
+      if: ${{ matrix.mpi == 'on' }}
+      run: |
+           echo "CXX=mpicxx" >> $GITHUB_ENV
+
     - name: Configure Kokkos
       if: ${{ matrix.kokkos == 'on' }}
       shell: bash
@@ -47,9 +63,9 @@ jobs:
       working-directory: ${{github.workspace}}/omega_h
       run: cmake .
            -Bbuild
-           -DCMAKE_CXX_COMPILER=${{ matrix.compiler }}
+           -DCMAKE_CXX_COMPILER=$CXX
            -DCMAKE_VERBOSE_MAKEFILE=on
-           -DOmega_h_USE_MPI=off
+           -DOmega_h_USE_MPI=${{ matrix.mpi }}
            -DOmega_h_USE_Kokkos=${{ matrix.kokkos }}
            -DKokkos_PREFIX=$GITHUB_WORKSPACE/kokkos/build/install
            -DBUILD_TESTING=ON
@@ -68,4 +84,4 @@ jobs:
 
     - name: Print
       if: always()
-      run: cat ${{github.workspace}}/omega_h/build/Testing/Temporary/LastTest.log
\ No newline at end of file
+      run: cat ${{github.workspace}}/omega_h/build/Testing/Temporary/LastTest.log