1e41f4b71Sopenharmony_ci# ArkCompiler Subsystem Changelog 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci## cl.arkcompiler.1 Field __unused in the stat, shminfo, msqid_ds, icmphdr, mq_attr, and utmpx Structs Is Renamed __unused1 4e41f4b71Sopenharmony_ci 5e41f4b71Sopenharmony_ci**Access Level** 6e41f4b71Sopenharmony_ci 7e41f4b71Sopenharmony_ciPublic API 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci**Change Reason** 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_ciThe **__unused** field in the **stat**, **shminfo**, **msqid_ds**, **icmphdr**, **mq_attr**, and **utmpx** structs conflicts with the **__unused** macro definition in **sys/cdefs.h**. If both of them are imported, a build error is reported. 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_ci**Change Impact** 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ciThis change is a non-compatible change. 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ciIn API version 11 and earlier versions, the **__unused** field in the preceding structs can be used normally. 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ciIn API version 12 and later versions, a build error is reported when the **__unused** field in the preceding structs is used. You need to change the **__unused** field to **__unused1**. 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ci**Start API Level** 22e41f4b71Sopenharmony_ci 23e41f4b71Sopenharmony_ci10 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ci**Change Since** 26e41f4b71Sopenharmony_ci 27e41f4b71Sopenharmony_ciOpenHarmony SDK 5.0.0.22 28e41f4b71Sopenharmony_ci 29e41f4b71Sopenharmony_ci**Key API/Component Changes** 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ciStructs **stat**, **shminfo**, **msqid_ds**, **icmphdr**, **mq_attr**, and **utmpx** 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci**Adaptation Guide** 34e41f4b71Sopenharmony_ci 35e41f4b71Sopenharmony_ciIf the **__unused** field in the preceding structs is used, change it to **__unused1**. 36e41f4b71Sopenharmony_ci 37e41f4b71Sopenharmony_ciIf the field is not used, no adaptation is required. 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ciThe **__unused** macro definition in **cdefs.h** is not affected. 40