fix ut build error using ld linker

deps/oblib/unittest/CMakeLists.txt

@@ -5,7 +5,16 @@ target_link_libraries(oblib_testbase INTERFACE -lgmock -lgtest)
 function(oblib_addtest mainfile)
   get_filename_component(testname ${mainfile} NAME_WE)
   add_executable(${testname} ${ARGV})
-  target_link_libraries(${testname} PRIVATE easy aio -L${DEP_DIR}/lib/mariadb mariadb oblib oblib_testbase -static-libgcc -static-libstdc++)
+  target_link_libraries(${testname} PRIVATE
+  -Wl,--start-group
+  aio
+  easy
+  -L${DEP_DIR}/lib/mariadb mariadb
+  oblib
+  oblib_testbase
+  -Wl,--end-group
+  -static-libgcc
+  -static-libstdc++)
 endfunction()
 
 add_subdirectory(lib)