Hi all, I was able to build rustc completely from sources. This means no network access during the build and without any Rust distributed binaries.
The steps are here: https://github.com/devrandom/powersoftau/wiki/Trusted-build-instructions-via-mrustc I'm still looking into building a cargo binary that supports TLS, to eliminate the need to download it for building powersoftau itself. Worst case we can use a shell script. Would like to merge https://github.com/ebfull/pairing/pull/72 so that we don't have to maintain a separate patch for Rust 1.19 compatibility. Sean, what is the best method of validating that the generated binary works correctly? Just use "new", then "compute" and then "verify_transform"? Also, I found that the generated binary is *very* different from the one generated by the downloadable Rust compiler. This is somewhat worrisome, although it doesn't affect us if we use the mrustc path. Will spend a bit more time to get to the bottom of it.
