From: Olaf Hering <olaf@aepfle.de>

Pass a timestamp to kbuild via an enviroment variable.

    TZ=UTC BUILD_TIMESTAMP=2007-01-01 make -kj O=../O vmlinux

This can be used when the kernel source is in a SCM and uname -v
is supposed to give the commit date and not the package build time.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/mkcompile_h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletion(-)

diff -puN scripts/mkcompile_h~kbuild-override-build-timestamp scripts/mkcompile_h
--- a/scripts/mkcompile_h~kbuild-override-build-timestamp
+++ a/scripts/mkcompile_h
@@ -30,7 +30,12 @@ UTS_VERSION="#$VERSION"
 CONFIG_FLAGS=""
 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
-UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS `LC_ALL=C LANG=C date`"
+if [ -n "$BUILD_TIMESTAMP" ]; then
+  TIMESTAMP="`LC_ALL=C LANG=C date -d "$BUILD_TIMESTAMP"`"
+else
+  TIMESTAMP="`LC_ALL=C LANG=C date`"
+fi
+UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
 
 # Truncate to maximum length
 
_