Add back makefile print variable
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@ -837,3 +837,8 @@ invalid-board:
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echo "Valid boards:" && \
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printf '%s\n' $(ALL_BOARDS_IN_PORT) | column -xc $$(tput cols || echo 80) 1>&2 && \
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false
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# Print out the value of a make variable.
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# https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile
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print-%:
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@echo $* = $($*)
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