Add adios1::adios dependency only to the MPI build for now, but not to the NOMPI build

source/CMakeLists.txt

@@ -40,16 +40,6 @@ foreach(adios2_target IN LISTS adios2_targets)
     PUBLIC ${ADIOS_SOURCE_DIR}/include
   )
   
-  if(ADIOS_USE_ADIOS1)
-    find_package(ADIOS REQUIRED)
-    target_sources(${adios2_target} PRIVATE
-      engine/adios1/ADIOS1Reader.cpp
-      engine/adios1/ADIOS1Writer.cpp
-    )
-    target_compile_definitions(${adios2_target} PRIVATE ADIOS_HAVE_ADIOS1)
-    target_link_libraries(${adios2_target} PRIVATE adios::adios)
-  endif()
-  
   if(ADIOS_USE_DataMan)
     find_package(DataMan REQUIRED)
     target_sources(${adios2_target} PRIVATE
@@ -79,6 +69,14 @@ if(ADIOS_USE_MPI)
   target_include_directories(adios2 PUBLIC ${MPI_C_INCLUDE_PATH})
   target_compile_definitions(adios2 PUBLIC ADIOS_HAVE_MPI)
   target_link_libraries(adios2 PUBLIC ${MPI_C_LIBRARIES})
-else()
-  target_sources(adios2 PRIVATE mpidummy.cpp)
+
+  if(ADIOS_USE_ADIOS1)
+    find_package(ADIOS1 REQUIRED)
+    target_sources(adios2 PRIVATE
+      engine/adios1/ADIOS1Reader.cpp
+      engine/adios1/ADIOS1Writer.cpp
+    )
+    target_compile_definitions(adios2 PRIVATE ADIOS_HAVE_ADIOS1)
+    target_link_libraries(adios2 PRIVATE adios1::adios)
+  endif()
 endif()