WIP: switch to FC=gfortran, CC=gcc in bld_oc.sh

 ### WIP: switch to FC=gfortran, CC=gcc in build_opencoarrays.sh

 - BROKEN due to needing to pass in FC and CC correctly pointing to
   gfortran and gcc (well CC could point to clang or a different C compiler)
 - This should help resolve some MPI problems
 - We may be able to remove the consistency check between mpi and gcc

Author: zbeekman

prerequisites/install-functions/build_opencoarrays.sh

@@ -1,3 +1,4 @@
+#shellcheck shell=bash
 # shellcheck disable=SC2154
 build_opencoarrays()
 {
@@ -9,12 +10,12 @@ build_opencoarrays()
   build_path="${build_path}"/opencoarrays/$("${opencoarrays_src_dir}"/install.sh -V opencoarrays)
   mkdir -p "$build_path"
   pushd "$build_path"
-  if [[ -z "${MPICC:-}" || -z "${MPIFC:-}" || -z "${CMAKE:-}" ]]; then
-    emergency "Empty MPICC=$MPICC or MPIFC=$MPIFC or CMAKE=$CMAKE [exit 90]"
+  if [[ -z "${MPICC:-}" || -z "${MPIFC:-}" || -z "${CMAKE:-}" || -z "${FC:-}" || -z "${CC:-}" ]]; then
+    emergency "Empty MPICC=$MPICC or MPIFC=$MPIFC or FC or CC or CMAKE=$CMAKE [exit 90]"
   else
     info "Configuring OpenCoarrays in ${PWD} with the command:"
-    info "CC=\"${MPICC}\" FC=\"${MPIFC}\" $CMAKE \"${opencoarrays_src_dir}\" -DCMAKE_INSTALL_PREFIX=\"${install_path}\""
-    CC="${MPICC}" FC="${MPIFC}" $CMAKE "${opencoarrays_src_dir}" -DCMAKE_INSTALL_PREFIX="${install_path}"
+    info "CC=\"${CC}\" FC=\"${FC}\" $CMAKE \"${opencoarrays_src_dir}\" -DCMAKE_INSTALL_PREFIX=\"${install_path}\" -DMPI_C_COMPILER=\"${MPICC}\" -DMPI_Fortran_COMPILER=\"${MPIFC}\""
+    CC="${CC}" FC="${FC}" $CMAKE "${opencoarrays_src_dir}" -DCMAKE_INSTALL_PREFIX="${install_path}" -DMPI_C_COMPILER="${MPICC}" -DMPI_Fortran_COMPILER="${MPIFC}"
     info "Building OpenCoarrays in ${PWD} with the command make -j${num_threads}"
     make "-j${num_threads}"
     if [[ ! -z ${SUDO:-} ]]; then