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[build] Replace random build ID with a deterministic one 

Calculate the build ID as a checksum over the input files.  Since the
input files include $(BIN)/version.%.o which itself includes the build
target name (from which TGT_LD_FLAGS is calculated), this should be
sufficient to meet the requirement that the build ID be unique for
each $(BIN)/%.tmp even within the same build run.

Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/242/head
Manuel Mendez 2021-01-28 16:45:04 -05:00 committed by Michael Brown
parent bc4979e2cf
commit d8dc06fbf9
1 changed files with 7 additions and 1 deletions
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8
src/Makefile.housekeeping
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@ -1163,7 +1163,13 @@ blib : $(BLIB)
# Command to generate build ID. Must be unique for each $(BIN)/%.tmp,
# even within the same build run.
#
BUILD_ID_CMD := perl -e 'printf "0x%08x", int ( rand ( 0xffffffff ) );'
# The build ID is supposed to be collision-free across all ROMs that
# might ever end up installed in the same system. It doesn't just
# disambiguate targets within a single build; it also disambiguates
# different builds (such as builds for multiple ROMs all built from
# the same blib.a).
#
BUILD_ID_CMD = sha1sum $^ | sort | cksum | awk '{printf "0x%08x", $$1}'
# Build timestamp
#