[Webkit-unassigned] [Bug 246718] New: [Xcode] Race condition when generating IDLFileNamesList.txt

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246718

            Bug ID: 246718
           Summary: [Xcode] Race condition when generating
                    IDLFileNamesList.txt
           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: emw at apple.com

WebCore's DerivedSources.make generates this file once per invocation of preprocess-idls.pl:

    $(IDL_INTERMEDIATE_PATTERNS) : …
        $(shell echo $(JS_BINDING_IDLS) | tr " " "\n" > IDLFileNamesList.txt)
        $(PERL) $(WebCore)/bindings/scripts/preprocess-idls.pl …

This can cause race conditions where proprocess-idls.pl is reading the list while another thread is regenerating it. We only need to generate it once, so this can be fixed by generating the list as a separate step.

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