zephyr-sdk-ng

The Zephyr SDK provides the GNU cross-compilation toolchains used to build
the Zephyr RTOS for every supported target architecture. This snap builds
the toolchains from source with the bundled crosstool-NG.

The base snap contains the architecture-independent SDK tree (the CMake
package that lets findpackage(Zephyr-sdk) locate the toolchains, the
sdkversion / sdktoolchains metadata and the setup helper) together with
the default x8664-zephyr-elf toolchain. Install the matching
zephyr-sdk-ng+<target> component to add any other toolchain.

Point the Zephyr build system at the SDK with:
export ZEPHYRSDKINSTALL_DIR=/snap/zephyr-sdk-ng/current/usr/lib