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[build] Generate random build identifier

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Randomly generate a 32-bit build identifier that can be used to
identify identical iPXE ROMs when multiple such ROMs are present in a
system (e.g. when a multi-function NIC exposes the same iPXE ROM image
via each function's expansion ROM BAR).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-04-24 19:15:51 +01:00
parent 483c3c06ab
commit 58f6e55362
2 changed files with 10 additions and 2 deletions
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9
src/Makefile.housekeeping
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@@ -686,13 +686,18 @@ $(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
$(Q)$(RANLIB) $@
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 ) );'
# Build an intermediate object file from the objects required for the
# specified target.
#
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
$(QM)$(ECHO) " [LD] $@"
$(Q)$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $(BLIB) -o $@ \
-Map $(BIN)/$*.tmp.map
--defsym _build_id=`$(BUILD_ID_CMD)` -Map $(BIN)/$*.tmp.map
$(Q)$(OBJDUMP) -ht $@ | $(SORTOBJDUMP) >> $(BIN)/$*.tmp.map
# Keep intermediate object file (useful for debugging)