[Webkit-unassigned] [Bug 212500] New: REGRESSION (r262245): WebCore's "Check .xcfilelists" build phase is ~100x slower

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212500

            Bug ID: 212500
           Summary: REGRESSION (r262245): WebCore's "Check .xcfilelists"
                    build phase is ~100x slower
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aestes at apple.com

Prior to <https://trac.webkit.org/r262245>, when building the 'All Source' scheme in WebKit.xcworkspace, WebCore's "Check.xcfilelists" build phase took ~1 second. With r262245, it takes ~95 seconds.

Modifying Source/WebCore/Scripts/check-xcfilelists.sh to invoke generate-xcfilelists with the "--debug" flag, I see that almost all the time is spent in a subshell invoking Source/WebCore/Scripts/generate-derived-sources.sh.

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