The SOURCE_DATE_EPOCH mechanism for reproducible builds requires the GNU variant of date. Respect this and search it, error on missing GNU date.
Signed-off-by: Andreas Bießmann andreas.devel@googlemail.com --- This commit tries to figure out if we have a GNU date variant available. It errors on missing GNU date when it is required (for SOURCE_DATE_EPOCH set). The result is:
---8<--- abiessmann@punisher % PATH=$ARMv5_PATH:$PATH CROSS_COMPILE=arm-v5te-linux-gnueabi- make SOURCE_DATE_EPOCH="`date -R`" O=/tmp/picosam ARCH=arm include/generated/timestamp_autogenerated.h make[1]: Entering directory '/tmp/picosam' /home/abiessmann/src/u-boot/Makefile:1303: *** "No GNU date found". Stop. make[1]: Leaving directory '/tmp/picosam' Makefile:146: recipe for target 'sub-make' failed make: *** [sub-make] Error 2 abiessmann@punisher % PATH=$ARMv5_PATH:$PATH CROSS_COMPILE=arm-v5te-linux-gnueabi- make O=/tmp/picosam ARCH=arm include/generated/timestamp_autogenerated.h make[1]: Entering directory '/tmp/picosam' CHK include/generated/timestamp_autogenerated.h UPD include/generated/timestamp_autogenerated.h make[1]: Leaving directory '/tmp/picosam' --->8---
It applies on top of http://patchwork.ozlabs.org/patch/506856/ (Makefile: Use correct timezone for U_BOOT_TZ).
Makefile | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile index b9b2375..95eae64 100644 --- a/Makefile +++ b/Makefile @@ -346,6 +346,9 @@ PERL = perl PYTHON = python DTC = dtc CHECK = sparse +GNUDATE := $(foreach date,gdate date.gnu date, \ + $(shell _date=`which $(date)`; \ + $${_date} --version 2> /dev/null | $(AWK) "/GNU coreutils/ { print "$${_date}"; }"))
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) @@ -1281,9 +1284,9 @@ endef define filechk_timestamp.h (if test -n "$${SOURCE_DATE_EPOCH}"; then \ SOURCE_DATE="@$${SOURCE_DATE_EPOCH}"; \ - LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \ - LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \ - LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \ + LC_ALL=C $(GNUDATE) -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \ + LC_ALL=C $(GNUDATE) -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \ + LC_ALL=C $(GNUDATE) -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \ else \ LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \ LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \ @@ -1295,6 +1298,11 @@ $(version_h): include/config/uboot.release FORCE $(call filechk,version.h)
$(timestamp_h): $(srctree)/Makefile FORCE +ifneq ($(strip $(SOURCE_DATE_EPOCH)),) +ifeq ($(strip $(GNUDATE)),) + $(error "No GNU date found") +endif +endif $(call filechk,timestamp.h)
# ---------------------------------------------------------------------------