diff --git a/cmake/Env.cmake b/cmake/Env.cmake
index 535f063d479eb8eba2c19a0b31e48899b05f3ff2..b666a32b14fbf701379cfbd6386d47fc43081e3e 100644
--- a/cmake/Env.cmake
+++ b/cmake/Env.cmake
@@ -75,9 +75,9 @@ if (OB_USE_CLANG)
     set(REORDER_LINK_OPT "-Wl,--no-rosegment,--build-id=sha1,--no-warn-symbol-ordering,--symbol-ordering-file,${HOTFUNC_PATH}")
     set(OB_LD_BIN "${DEVTOOLS_DIR}/bin/ld.lld")
   endif()
-  set(CMAKE_CXX_FLAGS "--gcc-toolchain=${GCC9} ${DEBUG_PREFIX} -fcolor-diagnostics ${REORDER_COMP_OPT} -fmax-type-align=8 ${CMAKE_ASAN_FLAG} ${CMAKE_COVERAGE_FLAG} -std=gnu++11")
-  set(CMAKE_C_FLAGS "--gcc-toolchain=${GCC9} ${DEBUG_PREFIX} -fcolor-diagnostics ${REORDER_COMP_OPT} -fmax-type-align=8 ${CMAKE_ASAN_FLAG} ${CMAKE_COVERAGE_FLAG}")
-  set(CMAKE_CXX_LINK_FLAGS "${LD_OPT} --gcc-toolchain=${GCC9} ${DEBUG_PREFIX}")
+  set(CMAKE_CXX_FLAGS "--gcc-toolchain=${GCC9} ${DEBUG_PREFIX} ${AUTO_FDO_OPT} -fcolor-diagnostics ${REORDER_COMP_OPT} -fmax-type-align=8 ${CMAKE_ASAN_FLAG} ${CMAKE_COVERAGE_FLAG} -std=gnu++11")
+  set(CMAKE_C_FLAGS "--gcc-toolchain=${GCC9} ${DEBUG_PREFIX} ${AUTO_FDO_OPT} -fcolor-diagnostics ${REORDER_COMP_OPT} -fmax-type-align=8 ${CMAKE_ASAN_FLAG} ${CMAKE_COVERAGE_FLAG}")
+  set(CMAKE_CXX_LINK_FLAGS "${LD_OPT} --gcc-toolchain=${GCC9} ${DEBUG_PREFIX} ${AUTO_FDO_OPT}")
   set(CMAKE_SHARED_LINKER_FLAGS "${LD_OPT} -Wl,-z,noexecstack ${REORDER_LINK_OPT}")
   set(CMAKE_EXE_LINKER_FLAGS "${LD_OPT} -Wl,-z,noexecstack ${REORDER_LINK_OPT}")
 else() # not clang, use gcc