[bug #19448] Re-exec after "include file rebuild" is more dependent on filesystem timestamps than strictly necessary.

[Paul D. Smith]

Follow-up Comment #3, bug #19448 (project make):

Sorry, but you're incorrect about the way original UNIX make worked.  In
fact, every version of make that I'm familiar with does and has always
considered equal timestamps as "up to date".  The POSIX standard for make is
quite clear about this as well:

A target is considered out-of-date if it is older than any of its
prerequisites or if it does not exist.

And also:

The make utility examines time relationships and shall update those derived
files (called targets) that have modified times earlier than the modified
times of the files (called prerequisites) from which they are derived.

It's also incorrect to classify this behavior as a recent change in GNU make;
GNU make has always worked this way.

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