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| H A D | Makefile | a82cdd58 Sat Oct 02 09:28:12 CDT 2010 Blue Swirl <blauwirbel@gmail.com> 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 <blauwirbel@gmail.com>
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