CMSIS-Compiler version is offically updated upon releases of the CMSIS-Compiler pack.

The table below provides information about the changes delivered with specific versions of CMSIS-Compiler.

Version	Description
v2.2.0	Changes since CMSIS-Compiler 2.1.0: Add components that enable stdio retarget to UART Update example project AC6: correct _sys_read return value when rt_fs_read returns with error correct _mutex_initialize to check whether RTOS2 kernel is initialized IAR: add support for multithreading add support for file redirection
v2.1.0	AC6: correct _sys_open handling for OPEN_A, file is created if non-existent (#50) GCC: add missing forward declarations for retargeted functions (#51, #53) Add Cortex-M52 support GCC: Disable heap limit check in _sbrk_r implementation (#54)
v2.0.0	Added initial support for LLVM/Clang and IAR Compiler Introduce STDERR, STDIN, STDOUT APIs and components Attention: This change conflicts with user implementations version 1.0.0! Rename RTE component defines from RTE_Compiler_* to RTE_CMSIS_Compiler_* OS Interface, Arm Compiler: Remove C library thread space implementation
v1.0.0	Initial release replacing I/O Retarget from Keil.ARM-Compiler pack.