expand on the 0/1 requirement
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@ -27,6 +27,9 @@
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# Manually disable by overriding in #mpconfigboard.mk
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# Manually disable by overriding in #mpconfigboard.mk
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# These Makefile variables are used to implement the "any" and "all" functions.
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# These Makefile variables are used to implement the "any" and "all" functions.
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# Note that these only work when the arguments expand to "0" and/or "1" but not
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# if they expand to other values like "yes", "/bin/sh", or "false".
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#
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# Make's "sort" will transform a mixed sequence of 0s and 1s to "0 1" (because
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# Make's "sort" will transform a mixed sequence of 0s and 1s to "0 1" (because
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# it also eliminates duplicates), or a non-mixed sequence of "0" or "1" to just
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# it also eliminates duplicates), or a non-mixed sequence of "0" or "1" to just
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# itself. Thus, if all the inputs are 1 then the first word will be 1; if any
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# itself. Thus, if all the inputs are 1 then the first word will be 1; if any
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