Create intermediate backend lib to help loading backend plugins.

src/backends/CMakeLists.txt

@@ -0,0 +1,28 @@
+project(${bare_name}-backend CXX)
+
+add_library(${PROJECT_NAME} STATIC
+	backend_loader.cpp
+)
+
+target_include_directories(${PROJECT_NAME}
+	PUBLIC ${DINDEXER_PUB_INCLUDE_DIR}
+)
+target_include_directories(${PROJECT_NAME} SYSTEM
+	PUBLIC ${YAMLCPP_INCLUDE_DIR}
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE ${bare_name}-if
+	PUBLIC ${YAMLCPP_LIBRARY}
+	PUBLIC dl
+)
+
+#install(TARGETS ${PROJECT_NAME}
+#	LIBRARY DESTINATION lib
+#	RUNTIME DESTINATION bin
+#	ARCHIVE DESTINATION lib/static
+#)
+
+add_subdirectory(postgresql)
+
+add_dependencies(${PROJECT_NAME} ${bare_name}-backend-postgresql)