The g++ downloaded in MYSY2 cannot compile the file. error with cc1plus

[Horc-zh]

It says the app(cc1plus) doesn't start properly.

when I type which cc1plus , I find there is no such app in my environment

So ,I typed the command :
pacman -S mingw-w64-x86_64-toolchain

but from the output of which cc1plus, it seems there is still no cc1plus in my current environment.

How can I solve this problem, thanks a lot.QAQ

[Biswa96]

Please follow the basic installation steps from here https://www.msys2.org/ and check if gcc works from the mingw64 or ucrt64 launcher.