[build] Avoid using sha1sum when calculating build ID

The sha1sum command may not be available on all systems.  Use the
POSIX-confirming cksum instead.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index 25abe57124114545fd6c4817a0e0eae45ebae642..e91307023aef438259d9295b78bb338a0eee9125 100644 (file)
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -1176,7 +1176,7 @@ blib : $(BLIB)
 # different builds (such as builds for multiple ROMs all built from
 # the same blib.a).
 #
-BUILD_ID_CMD = sha1sum $^ | sort | cksum | awk '{printf "0x%08x", $$1}'
+BUILD_ID_CMD = cat $^ | cksum | awk '{printf "0x%08x", $$1}'
 
 # Build timestamp
 #