How to detect a Portenta in a library?

I'm writing some code to be included in a library that will use Portenta specific variations when compiling for the Portenta.

Currently, I'm using the following to detect if I'm running on a Portenta (just the M4 core at the moment). I guess I can expand that to include the M7 core too. But it seems a bit too broad in that it could pickup other boards too.

#if defined(CORE_CM4)

Is there a better define I can use to detect the Portenta?

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As you might have guessed already from Juraj's reply, there is an equivalent board identification macro for the Arduino Portenta H7 M7 board: ARDUINO_PORTENTA_H7_M7

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Great, thanks both. Totally answered