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This allows exporting variables only for some target. It will allow not exporting variables when not needed, and so prevent unnecessary evaluation.
20 lines
880 B
Makefile
20 lines
880 B
Makefile
include variables.mk
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# Timestamp in nanoseconds (to be an integer)
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# OSx 'date' does not support 'date +%s%N' so rely on python instead
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# It could be OSx specific but we do not have 'OS' defined here to differentiate
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date_nanoseconds = $(shell python -c 'import time; print(int(time.time() * 1000000000))')
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EXPORTED_VARIABLES = MY_VARIABLE CURRENT_TIME
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MY_VARIABLE = my_variable
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# Defered evaluation to the test
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CURRENT_TIME = $(call date_nanoseconds)
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$(call target-export-variables,test-exported-variables,$(EXPORTED_VARIABLES))
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test-exported-variables:
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$(Q)bash -c 'test "$(MY_VARIABLE)" = "$${MY_VARIABLE}" || { echo ERROR: "$(MY_VARIABLE)" != "$${MY_VARIABLE}"; exit 1; }'
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$(Q)bash -c 'test $(PARSE_TIME) -lt $${CURRENT_TIME} || { echo ERROR: $(PARSE_TIME) \>= $${CURRENT_TIME} >&2; exit 1; }'
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# Immediate evaluation for comparing
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PARSE_TIME := $(call date_nanoseconds)
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