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build system: allow overriding the build's timestamp

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This allows reproducible builds (same source and same compiler produce
bit-identical results) and also allows coordinating the timestamp across
multiple projects, eg. with another firmware.

Signed-off-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Patrick Georgi 2016-01-28 14:46:18 +01:00
parent dbc807179f
commit 2f5d4a485e
1 changed files with 5 additions and 1 deletions
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6
make_helpers/build_macros.mk
View file

@ -290,6 +290,10 @@ define MAKE_TOOL_ARGS
$(if $(3),$(eval $(call FIP_ADD_PAYLOAD,$(2),--$(3),bl$(1))))
endef
# Allow overriding the timestamp, for example for reproducible builds, or to
# synchronize timestamps across multiple projects.
# This must be set to a C string (including quotes where applicable).
BUILD_MESSAGE_TIMESTAMP ?= __TIME__", "__DATE__
# MAKE_BL macro defines the targets and options to build each BL image.
# Arguments:
@ -315,7 +319,7 @@ $(BUILD_DIR):
$(ELF): $(OBJS) $(LINKERFILE)
@echo " LD $$@"
@echo 'const char build_message[] = "Built : "__TIME__", "__DATE__; \
@echo 'const char build_message[] = "Built : "$(BUILD_MESSAGE_TIMESTAMP); \
const char version_string[] = "${VERSION_STRING}";' | \
$$(CC) $$(CFLAGS) -xc - -o $(BUILD_DIR)/build_message.o
$$(Q)$$(LD) -o $$@ $$(LDFLAGS) -Map=$(MAPFILE) --script $(LINKERFILE) \