See how the red color, starting from the printed Hello World, ends up spilling into the >>> prompt. In fact, any code we type into this prompt will also be colored red, as will any subsequent output! That is how Ansi colors work: once you print out the special code enabling a color, the color persists forever until someone else prints out the code for a different color, or prints out the Reset code to disable it.
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macOS Tahoe is available as a free software update. Some features may not be available in all regions or in all languages. See requirements at apple.com/os/macos.
use -march=native (or e.g. -march=znver3). They know amongst other things, the ISA capabilities