[U-Boot] [PATCH 2/3] Safer timestamp_autogenerated.h generation

[Loïc Minier]

Generate timestamp_autogenerated.h as safely as version_autogenerated.h.

Cc: patches at linaro.org
Signed-off-by: Loïc Minier <loic.minier at linaro.org>
---
 Makefile |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 0892908..2991357 100644
--- a/Makefile
+++ b/Makefile
@@ -568,8 +568,9 @@ $(VERSION_FILE):
 
 $(TIMESTAMP_FILE):
 		@mkdir -p $(dir $(TIMESTAMP_FILE))
-		@LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"' > $@
-		@LC_ALL=C date +'#define U_BOOT_TIME "%T"' >> $@
+		@LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"' > $@.tmp
+		@LC_ALL=C date +'#define U_BOOT_TIME "%T"' >> $@.tmp
+		@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
 
 easylogo env gdb:
 	$(MAKE) -C tools/$@ all MTD_VERSION=${MTD_VERSION}
-- 
1.7.5.4