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c90f6e51094a1ba4fb2aab35b78f23b6fda645d0 guix: Consistently use gcc-8 for $HOST (Carl Dong) Pull request description: Only non-base commit is the last commit:b5abb07d0dRight now, here's what we use in Gitian: - Linux: Focal's [`g++-8-<arch>-linux-gnu`](https://packages.ubuntu.com/focal/g++-8-aarch64-linux-gnu) (`8.4.0-3ubuntu1cross1`) - MinGW-w64: Focal's [`g++-mingw-w64`](https://packages.ubuntu.com/focal/g++-mingw-w64) (`9.3.0-7ubuntu1+22~exp1ubuntu4`) In Guix right now we use `gcc-9` across the board. I think it makes more sense to use `gcc-8` across the board, as it doesn't suffer from the `memcmp` bug, and is what debian buster (stable) does, meaning it will be well tested ([`g++-mingw-w64`](https://packages.debian.org/buster/g++-mingw-w64), [`g++-aarch64-linux-gnu`](https://packages.debian.org/buster/g++-aarch64-linux-gnu)). We can accomplish this somewhat easily using Guix as we have tighter control over the toolchain (see:b5abb07d0d). Let me know your thoughts! ACKs for top commit: MarcoFalke: Approach ACK c90f6e51094a1ba4fb2aab35b78f23b6fda645d0, haven't reviewed laanwj: Code review ACK c90f6e51094a1ba4fb2aab35b78f23b6fda645d0 hebasto: ACK c90f6e51094a1ba4fb2aab35b78f23b6fda645d0, I have reviewed the code and it looks OK, I agree it can be merged. Tree-SHA512: 3e5b9297305232273323aa745ec417ed1be2418ead0e432db7742f5d5f45efe6e4a2ed44328731512cff4bfde80e5f2dc350a131b8b8fb9207a2ef66bce27ed2
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