[Webkit-unassigned] [Bug 212500] 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

--- Comment #6 from Keith Rollin <krollin at apple.com> ---
(In reply to Darin Adler from comment #4)
> 
> Keith, do you understand what this could be?

Not off the top of my head. Andy says that the time is spent in generate-derived-sources.sh. The xcfilelist checking process invokes this script to run `make -f DerivedSources.make -d` so that it can capture the dependency information. There's not much to the script other than invoking `make` so I'd think all the time would be spent in `make`. I wonder if there's something weird about your changes and in invoking `make` with the -d option (which is what dumps the dependency information). Could `make` now be dumping tons of information?

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