Thank you for your inquiry.
The SEGGER-CC is our stable release version which is recommended for development.
The SEGGER-CC-NG is essentially a preview version of the SEGGER compiler that has experimental features and is always based on the latest clang trunk which usually is also stable but requires some longer testing by us, before features are moved from the -NG compiler to our stable release.
I hope this clarifies how the two compiler variants should be used and what to expect from them.
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