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Build a full sysroot by downloading the `wasi-sdk` repo, which has `llvm-project` and `wasi-libc` as submodules. `wasi-sdk` builds a `clang` in a unique configuration (with `wasm32-wasi` as a default target) and uses that `clang` to build the rest of the pieces for the wasm sysroot. In principle it should be possible to build the sysroot using our in-house automation-built `clang`, but I kept running into strange, hard-to-diagnose issues when I attempted that. If someone else is able to straighten out all the compilation issues, we could replace this script and stop pulling in `wasi-sdk` entirely, which would result in a build that takes much less time overall. Until then, this will have to do to unblock the rest of the wasm sandboxing work. Differential Revision: https://phabricator.services.mozilla.com/D54560 --HG-- extra : moz-landing-system : lando |
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