Message "avr-gcc-ar is not optimized"

Someone can explain this error to me?
It’s been released recently, only the first time i compile the code.

macOS will support in the next version only 64bit applications, no more 32bit.

I think the avr doesn’t become 64 bit…
Will i have to get used to this mistake?

That sounds similar to a report on the Arduino developers mailing list, but in that case it was cc1plus, although the poster did indicate he had gotten a warning about something different the day before.

It sounds like this is the relevant article about this message, which indicates it should be a one time message : 32-bit app compatibility with macOS High Sierra 10.13.4 and later – Apple Support (AU)

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