File ipxe.stable-build-id.patch of Package xen

From: Olaf Hering <olaf@aepfle.de>
Date: Thu, 19 Jan 2017 10:36:38 +0100
Subject: stable build-id

It is desirable to produce the same bits on subsequent
builds when the actual code of the package doesn't
change. (bsc#1011213)

Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 src/Makefile.housekeeping | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -1162,49 +1162,56 @@ VERYCLEANUP	+= $(BLIB_LIST)
 #
 BLIB		= $(BIN)/blib.a
 $(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
 	$(Q)$(RM) $(BLIB)
 	$(QM)$(ECHO) "  [AR] $@"
 	$(Q)$(AR) r $@ $(sort $(BLIB_OBJS))
 	$(Q)$(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 ) );'
+# NB: In the case of the SUSE ipxe package we want reproducible
+# builds, so we just use the TGT_PCI_VENDOR variable, which is already
+# a unique (in the context of the files we generate) hex value suitable
+# for specifying the build_id. We no longer define a BUILD_ID_CMD, as
+# we need to use the TGT_PCI_VENDOR variable directly in the link command
 
 # Build timestamp
 #
-BUILD_TIMESTAMP := $(shell date +%s)
+# NB: In the case of the SUSE qemu-ipxe package we want reproducible
+# builds, so we use a pre-determined timestamp, rather than the current
+# timestamp
+BUILD_TIMESTAMP := 0xdeadcafe
 
 # Build version
 #
 GIT_INDEX := $(if $(GITVERSION),$(if $(wildcard ../.git/index),../.git/index))
 $(BIN)/version.%.o : core/version.c $(MAKEDEPS) $(GIT_INDEX)
 	$(QM)$(ECHO) "  [VERSION] $@"
 	$(Q)$(COMPILE_c) -DBUILD_NAME="\"$*\"" \
 		-DVERSION_MAJOR=$(VERSION_MAJOR) \
 		-DVERSION_MINOR=$(VERSION_MINOR) \
 		-DVERSION_PATCH=$(VERSION_PATCH) \
 		-DVERSION="\"$(VERSION)\"" \
 		-c $< -o $@
 
 # Build an intermediate object file from the objects required for the
 # specified target.
 #
 $(BIN)/%.tmp : $(BIN)/version.%.o $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
 	$(QM)$(ECHO) "  [LD] $@"
-	$(Q)$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $< $(BLIB) -o $@ \
-		--defsym _build_id=`$(BUILD_ID_CMD)` \
+	set -x ; $(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $< $(BLIB) -o $@ \
+		--defsym _build_id="$(TGT_PCI_VENDOR)" \
 		--defsym _build_timestamp=$(BUILD_TIMESTAMP) \
 		-Map $(BIN)/$*.tmp.map
 	$(Q)$(OBJDUMP) -ht $@ | $(PERL) $(SORTOBJDUMP) >> $(BIN)/$*.tmp.map
 
 # Keep intermediate object file (useful for debugging)
 .PRECIOUS : $(BIN)/%.tmp
 
 # Show a linker map for the specified target
 #
 $(BIN)/%.map : $(BIN)/%.tmp
 	@less $(BIN)/$*.tmp.map
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