[erts] support cross-compilation and platform-specific toolchains#9
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denbeigh2000 merged 5 commits intomainfrom Apr 6, 2026
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Apr 3, 2026
denbeigh2000
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- [erts] fix up constraints around OTP toolchain
- [beam] cross-platform erlang/OTP compilation
- [misc] use external rules_cc
- erts: ensure we capture sysroot location before changing dir.
- adds platform constraints everywhere - stops probing for an external toolchain by default, remove default external registration (users must do this now, but doing it unconditionally means we *need* an external erl toolchain to do anything)
- adds cross-compilation support, so we can compile erlang/otp for other
platforms
- this totally rejigged how otp discovery works, now we need to
explicitly provide an `otp` to our container layer (as well as to
elixir, but that's not covered here)
- always use `make release` over `make install` during build
- we had to do a little "faking" to make this work, because OTP tries
really hard to avoid building the bootstrap OTP unnecessarily.
- however, if we want to write the compiled ERTS to cache and use it
on either system, we can't ever assume we'll be running on the local
system.
Needed for vanilla support for bazel 9+
also support using a single, host-specific OTP as the bootstrap OTP for either platform (it doesn't get included in the final output)
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