On Thu, Jun 09, 2016 at 05:57:55PM +0100, Daniel P. Berrange wrote: > +$(BUILD_DIR)/trace-events-all: $(trace-events-y:%=$(SRC_PATH)/%) > + $(call quiet-command,cat $^ > $@)
$^ needs to be a stable ordering across make invocations and across machines to avoid thrashing ccache and spuriously renumbering trace event IDs. I guess it is stable but just in case anyone knows of a case where $^ would change order without any changes to the actual files (e.g. readdir(2) returning things in a different order, make parallel jobs, etc)...
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