Ivan Grokhotkov 14e600801e cmake: allow selection of clang based toolchain ...

This is an experimental feature intended at the moment for ESP-IDF
developers only.

If IDF_TOOLCHAIN=clang environment variable or CMake variable is set,
use toolchain-clang-esp32xx.cmake instead of toolchain-esp32xx.cmake.

These changes aren't sufficient to actually build any IDF project with
clang; subsequent commits add a few workarounds required to do this.

Toolchain files are added for esp32 and esp32s2, which are the targets
supported in our llvm-project fork at the moment.

2021-09-16 10:54:27 +02:00

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