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...9;auto' and -mcrypto8.4-a etc, which is also ugly) The other option would be to allow -march without a base architecture. E.g. -march=armv8-a+crc -march=+crypto Or have them combine into some common set, which breaks existing behaviour: -march=armv8-a+crc -march=armv8.4-a+dsp -> -march=amv8-a+dsp+crc Which gets into a lot of issues around how you choose the set of features. Smallest subset to target the minimal core, or largest to allow CPU detection code to compile? So allowing march=+<ext> is the one that won't break existing builds but would be Clang only for now. I d...

Hi Manoj, Not too late at all, we have not got to that point of the work yet. Are there examples of this kind of build setup that are available publicly? I think I understand the problem but it'd help to see one in action. To see if there are any other Arm extensions that are already being added like this and whether those systems support GCC and how. Thanks, David Spickett.