ESP Quick Toolchain
In Sming 4.0.1 support was added for the ESP Quick Toolchain.
This also updates the runtime libraries (NewLib) to version 2.2 with integrated PROGMEM handling code.
The new toolchain is consistent across development platforms and adds support for the latest compiler features, as discussed in What are the new features in C++17?.
The toolchains are currently at pre-release, available here.
Tested versions are available at SmingTools <https://github.com/SmingHub/SmingTools>.
Extract the toolchain to a suitable location, such as: