Optimizing away "ReadFile" calls when Make calls stat()

[DJ Delorie]

> if they speed up Cygwin significantly, why aren't the people who
> precompile Cygwin for download using those switches by default?

Because using those switches when you shouldn't results in incorrect
behavior.  The defaults are *always* right, at the expense of speed.

> Win32 is slower, but not THAT much slower.

Actually, it is.  I did some benchmarks using the native Win32 API
directly, and Linux is way faster.

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