move long building tests to the be the first tests built with the hope of…

move long building tests to the be the first tests built with the hope of reducing build time. (#1229)

test/CMakeLists.txt

@@ -70,11 +70,11 @@ foreach(TEST_CONFIG ${UNIT_TEST_CONFIG_LIST})
 
     configure_file(backend_test.in.cpp backend_test_${BACKEND_NAME}.cpp)
     configure_file(convolution_test.in.cpp convolution_test_${BACKEND_NAME}.cpp)
-    set(SRC ${SRC} ${CMAKE_CURRENT_BINARY_DIR}/backend_test_${BACKEND_NAME}.cpp)
-    set(SRC ${SRC} ${CMAKE_CURRENT_BINARY_DIR}/convolution_test_${BACKEND_NAME}.cpp)
+    set(SRC ${CMAKE_CURRENT_BINARY_DIR}/backend_test_${BACKEND_NAME}.cpp ${SRC})
+    set(SRC ${CMAKE_CURRENT_BINARY_DIR}/convolution_test_${BACKEND_NAME}.cpp ${SRC})
     if(NGRAPH_DISTRIBUTED_ENABLE)
         configure_file(distributed.cpp distributed_${BACKEND_NAME}.cpp)
-        set(SRC ${SRC} ${CMAKE_CURRENT_BINARY_DIR}/distributed_${BACKEND_NAME}.cpp)
+        set(SRC ${CMAKE_CURRENT_BINARY_DIR}/distributed_${BACKEND_NAME}.cpp  ${SRC})
     endif()
 
     # Some---but not all---autodiff tests go through multiple iterations with
@@ -89,7 +89,7 @@ foreach(TEST_CONFIG ${UNIT_TEST_CONFIG_LIST})
     endif()
 
     configure_file(autodiff.in.cpp autodiff_${BACKEND_NAME}.cpp)
-    set(SRC ${SRC} ${CMAKE_CURRENT_BINARY_DIR}/autodiff_${BACKEND_NAME}.cpp)
+    set(SRC ${CMAKE_CURRENT_BINARY_DIR}/autodiff_${BACKEND_NAME}.cpp ${SRC})
 
     message(STATUS "Adding unit test for backend ${BACKEND_NAME}")
 endforeach()