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enable-if-any/all deserve some commentary.

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Jeff Epler 2023-07-31 10:21:53 -05:00
parent 020e4d2e0c
commit e8307a4c02
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1 changed files with 9 additions and 8 deletions
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17
py/circuitpy_mpconfig.mk
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@ -26,17 +26,18 @@
# Boards default to all modules enabled (with exceptions)
# Manually disable by overriding in #mpconfigboard.mk
# These Makefile variables are used to implement the "any" and "all" functions.
# Make's "sort" will transform a mixed sequence of 0s and 1s to "0 1" (because
# it also eliminates duplicates), or a non-mixed sequence of "0" or "1" to just
# itself. Thus, if all the inputs are 1 then the first word will be 1; if any
# of the inputs are 1, then the last word will be 1.
enable-if-any=$(lastword $(sort $(1) 0))
enable-if-all=$(firstword $(sort $(1) 1))
#$(info enable-if-any 0 1 -> $(call enable-if-any,0 1))
#$(info enable-if-any 1 0 -> $(call enable-if-any,1 0))
#$(info enable-if-any 1 1 -> $(call enable-if-any,1 1))
#$(info enable-if-any 0 0 -> $(call enable-if-any,0 0))
#$(info enable-if-all 0 1 -> $(call enable-if-all,0 1))
#$(info enable-if-all 1 0 -> $(call enable-if-all,1 0))
#$(info enable-if-all 1 1 -> $(call enable-if-all,1 1))
#$(info enable-if-all 0 0 -> $(call enable-if-all,0 0))
# To use any/all, you "$(call)" it, with the values to test after a comma.
# Usually the values are other $(CIRCUITPY_foo) variables. The definition
# of CIRCUITPY_AUDIOCORE and CIRCUITPY_AUDIOMP3 below are typical of how
# any/all are expected to be used.
# Always on. Present here to help generate documentation module support matrix for "builtins".
CIRCUITPY = 1