Add ESP32 example with a portable smoke test - #396
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Builds WasmKit for ESP32-C6 via ESP-IDF v5.5 + Embedded Swift (one IDF component per SwiftPM module) and runs a wasm module on emulated ESP32-C3 in QEMU via Examples/embedded-esp32/smoke-test.sh. A new build-embedded CI job compile-checks the engine for riscv32-none-none-eabi with Embedded Swift (Utilities/build-embedded.sh), so embedded compatibility is maintained without ESP-IDF on the runners. The Embedded Swift support in the engine was originally developed by Joannis Orlandos in #357. Co-authored-by: Joannis Orlandos <joannis@orlandos.nl>
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Final part of the incremental upstreaming of Embedded Swift support (#357). Follows #395.
Adds
Examples/embedded-esp32: an ESP-IDF (v5.5) project that runs WasmKit on an ESP32-C6 with Embedded Swift, plus a portable smoke test.wasmtypes,wasmparser,wasmkit,cwasmkit), compiled with-enable-experimental-feature Embeddedand no traits enabled.add,mul3calling back into a hostmulfunction), and shows host-error identity: a host function throwsDemoHostError(code: 42)and the embedder catches it withcatch let error as DemoHostError.smoke-test.shlocates ESP-IDF and the newest Swift development snapshot, patches ESP-IDF's linker template for.got(idempotently), and builds for esp32c6;--qemuadditionally builds for esp32c3 and runs the demo under QEMU, asserting the expected output.Two CI jobs keep this working:
build-embeddedcompile-checks the engine forriscv32-none-none-eabiwith Embedded Swift (Utilities/build-embedded.sh) — fast, no ESP-IDF needed.smoke-esp32runs the full smoke test in theespressif/idf:v5.5container: installs a Swift development snapshot and Espressif's QEMU, builds for esp32c6 and esp32c3, and boots the demo in QEMU asserting its output.Verified: esp32c6 build and the QEMU run pass (
2 + 3 = 5,7 * 3 = 21,host error 42).The Embedded Swift support in the engine (#388–#395) was originally developed by @Joannis in #357.