Update error handling & messages in caf & cafrun

Author: zbeekman

src/extensions/caf.in

@@ -327,10 +327,11 @@ fi
 set +o errtrace
 set +o errexit
 if "${cafc}" "${compiler_args[@]}" ; then
-  exit 0
+  exit $?
 else
+  return_code=$?
   echo "Error: comand:" >&2
   echo "   \`${cafc} ${compiler_args[*]}\`" >&2
   echo "failed to compile." >&2
-  exit 12
+  exit "${return_code}"
 fi

src/extensions/cafrun.in

@@ -262,7 +262,15 @@ elif [[ "${1}" == -np || "${1}" == -n ]]; then
       mpiexec_args+=("${@:4:$((${#} - 3))}")
     fi
 
-    "${CAFRUN}" "${mpiexec_args[@]//''/}"
+    if "${CAFRUN}" "${mpiexec_args[@]//''/}" ; then
+      exit $?
+    else
+      return_code=$?
+      echo "Error: Command:" >&2
+      echo "   \`${CAFRUN}" "${mpiexec_args[*]//''/}\`" >&2
+      echo "failed to run." >&2
+      exit "${return_code}"
+    fi
   else
     echo "You must pass \"-np\", \"<number_of_images>\", \"/path/to/coarray_Fortran_program\" as the first 3 arguments to ${cmd}."
     exit 1