feat: integrate synth — WASM-to-ARM compiler as a hermetic toolchain - #468
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synth (pulseengine/synth) published its first real release — v0.3.1, with 4 platform binaries + SHA256SUMS — so it can now be a first-class downloaded toolchain instead of a user-supplied binary. synth is the final stage of the PulseEngine pipeline: it AOT-compiles a WASM core module to an ARM Cortex-M ELF. - checksums/tools/synth.json — JSON registry entry, 4 platforms (no Windows), verified SHA256 - toolchains/tool_registry.bzl — synth URL pattern - toolchains/synth_toolchain.bzl + toolchains/BUILD.bazel — synth_toolchain_type - wasm/extensions.bzl — synth module extension - MODULE.bazel — register the synth toolchain - wasm/private/synth_compile.bzl — resolve the synth binary from the toolchain; the `synth` attr is now optional (escape hatch for a locally-built binary) rather than mandatory - examples/synth_example — compiles a core module to an ARM Cortex-M ELF Validated: //examples/synth_example:math_firmware builds — synth 0.3.1 downloads checksum-verified and emits a 32-bit ARM EABI5 ELF. Completes the tool-integration track (rivet DD-003): spar, witness, and now synth are all first-class toolchains — synth is no longer deferred. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This was referenced Jun 14, 2026
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…489) (#505) * feat(wasm): wasm_component_import — adopt a prebuilt .wasm component (#489) Adds a first-class rule to bring an already-built component (fetched release asset, vendored, or committed fixture) into the build graph as a WasmComponentInfo, so wasm_validate / wasm_optimize / meld_fuse / synth_compile / signing can consume it without rebuilding from source. Per the issue direction: - returns WasmComponentInfo (wasm_file set, component_type "component", profile "release", empty profile_variants, wit_info None) - optional caller-declared imports/exports (default empty — does not hard-fail on a stripped/opaque component) - wired into wasm/defs.bzl exports + a bzl_library in wasm/private/BUILD.bazel - examples/component_import_example: adopt-then-validate build_test Replaces the downstream adopt_wasm_component shim consumers (e.g. jess) carry. Closes #489 (item 1; item 2 synth_compile already landed in #468/v1.1.0). * fix(example): repoint wasm_component_import example at a real component The example referenced prebuilt_component.wasm, which was never committed, so //examples/component_import_example couldn't build. Point `wasm` at an existing built component (//examples/basic:hello_component) instead — hermetic (no binary in git) and proves the adopt -> validate path round-trips on a real component. Verified: bazel test //examples/component_import_example:component_import_test PASSES. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Ralf Anton Beier <rbeier57@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
synth (
pulseengine/synth) published its first real release — v0.3.1,with 4 platform binaries +
SHA256SUMS— so it graduates from "deferred" to afirst-class downloaded toolchain. synth is the final stage of the PulseEngine
pipeline: it AOT-compiles a WASM core module to an ARM Cortex-M ELF.
Until now
synth_compilerequired a mandatorysynthattr pointing at alocally-built binary (synth had no releases). This PR adds the toolchain and
makes the rule use it.
Changes
checksums/tools/synth.json— JSON registry entry; 4 platforms(darwin/linux × amd64/arm64 — synth publishes no Windows binary), verified SHA256
toolchains/tool_registry.bzl— synth URL patterntoolchains/synth_toolchain.bzl+toolchains/BUILD.bazel—synth_toolchain_type(stub-on-unsupported-platform pattern, like meld, so Windows builds that
don't touch
synth_compilestill resolve)wasm/extensions.bzl—synthmodule extensionMODULE.bazel— register the synth toolchainwasm/private/synth_compile.bzl— resolve the synth binary from thetoolchain; the
synthattr is now optional (escape hatch for alocally-built binary) rather than mandatory
examples/synth_example— compiles a core module to an ARM Cortex-M ELFValidation
//examples/synth_example:math_firmwarebuilds — synth 0.3.1 downloadschecksum-verified and emits a 32-bit ARM EABI5 ELF (the two exported
functions compiled to ARM machine code).
Completes the tool-integration track (rivet
DD-003): spar, witness, and nowsynth are all first-class toolchains. synth is no longer deferred.
🤖 Generated with Claude Code