Ensure build reproducibility #2
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vigejolla
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Sep 14, 2022
| BUILD_DATE ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "+$(DATE_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "+$(DATE_FMT)" 2>/dev/null || date -u "+$(DATE_FMT)") | ||
| BUILD_TIME ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "+$(TIME_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "+$(TIME_FMT)" 2>/dev/null || date -u "+$(DATE_FMT)") | ||
| -CFLAGS += -DBUILD_DATE=\"${BUILD_DATE}\" -DBUILD_TIME=\"${BUILD_TIME}\" | ||
| +CFLAGS += -DBUILD_DATE="\"${BUILD_DATE}\"" -DBUILD_TIME="\"${BUILD_TIME}\"" |
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Are the double quotes really necessary? Well I guess they are, otherwise you wouldn't have added them, they just feel a bit funny.
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Yup, the value of BUILD_DATE contains spaces, so it needs to be quoted on command line. And then the macro is meant to expand to a string literal, so it needs the escaped quotes inside.
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