A user reported the LEDC PWM RGB example failing to compile. The sketch
calls ledcAttach(pin, freq, resolution) — the one-shot API added in
arduino-esp32 3.x. Our toolchain image pins arduino-esp32 to 2.0.17
(matched to ESP-IDF 4.4.7 + the lcgamboa QEMU ROM), where the API is
the older two-step ledcSetup + ledcAttachPin pair. Sketches written
against 3.x docs hit "ledcAttach was not declared in this scope".
Bumping arduino-esp32 to 3.x means moving to ESP-IDF 5.x, which may
break our QEMU fork. Cheaper fix: ship a compat shim header in the
ESP-IDF project template that defines ledcAttach + ledcAttachChannel
in terms of the 2.x API, gated on `!defined(ledcAttach)` so it
disappears the day we bump.
espidf_compiler.py now injects #include "velxio_compat.h" right after
Arduino.h whether the user explicitly included Arduino.h or we
prepended it ourselves.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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