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Revision a82cdd58


Added by Blue Swirl about 11 years ago

trace: avoid unnecessary recompilation if nothing changed

Add logic to detect changes in generated files. If the old
and new files are identical, don't touch the generated file.
This avoids a lot of churn since many files depend on trace.h.

Based on suggestion by Paolo Bonzini.

Signed-off-by: Blue Swirl <>


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