[Webkit-unassigned] [Bug 249368] New: REGRESSION(257515 at main): breaks build with -flto=auto

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249368

            Bug ID: 249368
           Summary: REGRESSION(257515 at main): breaks build with -flto=auto
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at gnome.org
                CC: bugs-noreply at webkitgtk.org

WebKitGTK 2.39.3 fails to link lib/libwebkitgtk-6.0.so.0.0.0 with -flto=auto. The rror message is:

lto1: fatal error: missing resolution data for _ZTVN7WebCore17SpeechRecognitionE

I had no clue what this error message meant, and there seem to be zero relevant search results on the internet, and also zero changes to Speech Recognition code between 2.39.2 and 2.39.3. So I bisected it and found the first bad commit is 257515 at main "[JSC] Clean up Structure transition watchpoint firing to pave a way to faster / cheap adaptive watchpoint" which makes no sense.

This result is so weird that I will double check the results of my bisect tomorrow, just to be certain. My checkout is on 257514 at main right now and it builds fine, so I will test 257515 at main again.

I wonder if there might be a toolchain bug here.

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