[Webkit-unassigned] [Bug 216100] New: run-webkit-tests spends 20-30 seconds "building" ImageDiff every time, despite being already built and specifying --no-build

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216100

            Bug ID: 216100
           Summary: run-webkit-tests spends 20-30 seconds "building"
                    ImageDiff every time, despite being already built and
                    specifying --no-build
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jbedard at apple.com

Tools/Scripts/build-imagediff --release

takes an inordinate amount of time for a null build (20-30 seconds), and run-webkit-tests calls it on every invocation, even if you pass --no-build.

This is 40-50% of the time it takes to run-webkit-tests a single test in the iOS simulator, and thus would wildly increase the turnaround rate when developing a test.

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