Build with Zoltan on MinGW CI.

Downgrade incompatible-pointer-types to a warning to work around build
error of Zoltan with newer GCC.

Also link to ParMetis libraries when linking to Zoltan with enabled
ParMetis. (It is force-enabled in the bundled version of Zoltan.)

.github/workflows/build-windows-mingw.yaml

@@ -32,6 +32,8 @@ jobs:
 
       - name: checkout repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: install dependencies
         uses: msys2/setup-msys2@v2
@@ -57,6 +59,8 @@ jobs:
           mpi: msmpi
 
       - name: configure
+        # Downgrade incompatible-pointer-types to a warning to work around
+        # build error of Zoltan with newer GCC.
         run: |
           mkdir ${GITHUB_WORKSPACE}/build
           cd ${GITHUB_WORKSPACE}/build
@@ -68,7 +72,10 @@ jobs:
             -DBLA_VENDOR="OpenBLAS" \
             -DWITH_OpenMP=ON \
             -DWITH_LUA=ON \
-            -DWITH_Zoltan=OFF \
+            -DWITH_Zoltan=ON \
+            -DCMAKE_C_FLAGS="-Wno-error=incompatible-pointer-types" \
+            -DParMetis_LIBRARIES="-lparmetis -lmetis" \
+            -DParMetis_INCLUDE_DIR="${MSYSTEM_PREFIX}/include" \
             -DWITH_Mumps=OFF \
             -DWITH_ELMERGUI=ON \
             -DCREATE_PKGCONFIG_FILE=ON \

fem/src/CMakeLists.txt

@@ -171,6 +171,9 @@ ENDIF()
 
 IF(HAVE_ZOLTAN)
   TARGET_LINK_LIBRARIES(elmersolver ${ZOLTAN_LIBRARY})
+  IF(Zoltan_ENABLE_ParMETIS)
+    TARGET_LINK_LIBRARIES(elmersolver ${ParMetis_LIBRARIES})
+  ENDIF()
   ADD_DEPENDENCIES(elmersolver ${ZOLTAN_LIBRARY})
   # SET(ELMERSOLVER_RPATH_STRING_MOD "${ELMERSOLVER_RPATH_STRING_MOD}/:${ZOLTAN_LIBDIR}")
   # SET(ELMERLIB_RPATH_STRING "${ELMERLIB_RPATH_STRING}/:${ZOLTAN_LIBDIR}")