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Dependents of modified files are no longer rebuilt by default, only if it turns out that file's interface has changed. There is a flag -driver-always-rebuild-dependents to override this, but we expect it to only be used for testing. (Most of the existing dependency tests pick up this option; the two new tests have "interface-hash" in the name.) This is the second half of ChrisW's work on interface hashing. rdar://problem/15352929 Swift SVN r30478