[heavensteeth]

Then you need to build GCC without GCC.

[pabs3]

That is possible too:

https://guix.gnu.org/en/blog/2023/the-full-source-bootstrap-... https://bootstrappable.org/ https://lwn.net/Articles/983340/

[fweimer]

The GCC project wants it to be possible to build GCC with a C++11 compiler that is not GCC.