When only one version of the compiler is installed, if this compiler is deleted and another version is installed, but the file settings remain unchanged and are still set to use the previous version of the compiler, the compiler will not be found during compilation.
If multiple versions of the compiler are installed simultaneously, you can change which version of the compiler is currently being used by modifying this file.
When there are multiple versions of engines on the computer, it is necessary to switch between different compilers to use them. For example, my computer is also installed with 4.27, 5.2, and 5.4