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The solution from Bob Steagall with his gcc-builder works very well because the latest GCC won't be uninstalled and I can even switch multiple GCC versions I need. I found these two articles are very useful:

1. https://bobsteagall.com/2017/12/30/gcc-builder/
2. https://wiyogo.com/articles/2019/how-to-easily-build-an-old-gcc-in-fedora-29.html