On Debian and derivatives, the package you’re looking for is gcc-arm-none-eabi:

apt install gcc-arm-none-eabi

To find this out yourself in future, install apt-file, update your indexes and use it to search for commands:

apt install apt-file
apt-file update
apt-file search bin/arm-none-eabi-gcc

Hello @lotou,To determine the version of the toolchain used with your CubeIDE, navigate to the directory: C:\ST\STM32CubeIDE_1.18.0\STM32CubeIDE\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.13.3.rel1.win32_1.0.0.202411081344\tools\bin Note: adjust the identifiers according to your system.Open the command prompt and execute the command: ./arm-none-eabi-gcc --version.This will display the GCC compiler version. You can then download it directly from ARM's websiteFor example: ARM GNU Toolchain.Regarding cyclomatic complexity, it measures the number of linear paths, branching points, and loops in your code. Higher complexity increases the likelihood of crashes in your application. By incorporating cyclomatic complexity checks into your build pipeline, you can periodically ensure your solution hasn't regressed into a more failure-prone version. But you should keep in mind that it is not a performance metric of your code.To know more about the usage of cyclomatic complexity in CubeIDE, refer to UM2609 for CubeIDE, specifically section 4.1 Cyclomatic Complexity.