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Does Cons re-scan a file every time it calculates dependencies?

April 26, 2017calculates cons dependencies file re-scan time

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Does Cons re-scan a file every time it calculates dependencies?

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Not within a single invocation. If multiple source files all #include a given .h file, then Cons only scans that .h file (and any subsidiary .h files that it includes) once, and remembers the result for later files that also #include that .h file. Every time Cons is invoked, however, it does re-scan each .h file once.