1e41f4b71Sopenharmony_ci# ArkCompiler Subsystem Changelog 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci## cl.arkcompiler.1 Change in ArkCompiler AOT Enabling Mode 4e41f4b71Sopenharmony_ci**First Applicable Version** 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciOpenHarmony_4.1.6.2 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**Reason for Change** 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ciThe change is made to enable the use of AOT in the user version. 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci**Change Impact** 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ciThis change is a compatible change. 15e41f4b71Sopenharmony_ci 16e41f4b71Sopenharmony_ci- Before change: AOT is only available for ROM images of the root version. 17e41f4b71Sopenharmony_ci- After change: AOT is also available for ROM images of the user version. 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ci**API Level** 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ciN/A 22e41f4b71Sopenharmony_ci 23e41f4b71Sopenharmony_ci**Change Since** 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ciOpenHarmony_4.1.6.2 26e41f4b71Sopenharmony_ci 27e41f4b71Sopenharmony_ci**Key API/Component Changes** 28e41f4b71Sopenharmony_ci 29e41f4b71Sopenharmony_ciArkCompiler AOT enabling mode 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci**Adaptation Guide** 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ciFor details, see [AOT Guide](https://gitee.com/openharmony/arkcompiler_ets_runtime/blob/master/docs/aot-guide_zh.md). 34