[Webkit-unassigned] [Bug 232989] [GTK] 2.34.1 Compiler warnings

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232989

--- Comment #2 from Michael Catanzaro <mcatanzaro at gnome.org> ---
(In reply to Michael Catanzaro from comment #1)
> I haven't looked closely, but my experience with -Wstringop-overread is the
> warning is almost always a false positive, or else so obtuse and unclear
> that it's unclear whether anything is actually wrong. This one is
> particularly annoying since it's coming from generated sources, so we'd have
> to investigate the generator to see what's going on. I think it's only worth
> investigating if the warning still happens when building trunk.

This one is actually happening with trunk. Maybe GCC changed? Fortunately, I have a much better warning message in my build:

[5489/5749] Linking CXX executable bin/TestWebKitAPI/TestWebCore
/home/mcatanzaro/Projects/WebKit/Source/ThirdParty/ANGLE/src/compiler/translator/ParseContext.h:33: note: type name ‘sh::TParseContext’ should match type name ‘angle::pp::Tokenizer::Context’
   33 | class TParseContext : angle::NonCopyable
      | 
/home/mcatanzaro/Projects/WebKit/Source/ThirdParty/ANGLE/src/compiler/preprocessor/Tokenizer.h:25: note: the incompatible type is defined here
   25 |     struct Context
      | 
In member function ‘get’,
    inlined from ‘__conv_op ’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WTF/Headers/wtf/Packed.h:198:48,
    inlined from ‘__conv_op ’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WTF/Headers/wtf/RefPtr.h:89:57,
    inlined from ‘isShared’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/JavaScriptCore/PrivateHeaders/JavaScriptCore/ArrayBuffer.h:93:36,
    inlined from ‘isShared’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/JavaScriptCore/PrivateHeaders/JavaScriptCore/ArrayBuffer.h:211:31,
    inlined from ‘unsharedBuffer’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/JavaScriptCore/PrivateHeaders/JavaScriptCore/ArrayBufferView.h:61:9,
    inlined from ‘send’ at /home/mcatanzaro/Projects/WebKit/Source/WebCore/Modules/websockets/WebSocket.cpp:386:52,
    inlined from ‘operator()’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WebCore/DerivedSources/JSWebSocket.cpp:537:5,
    inlined from ‘toJS’ at /home/mcatanzaro/Projects/WebKit/Source/WebCore/bindings/js/JSDOMConvertBase.h:168:18,
    inlined from ‘jsWebSocketPrototypeFunction_send2Body’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WebCore/DerivedSources/JSWebSocket.cpp:537:5,
    inlined from ‘jsWebSocketPrototypeFunction_sendOverloadDispatcher’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WebCore/DerivedSources/JSWebSocket.cpp:578:13,
    inlined from ‘call’ at /home/mcatanzaro/Projects/WebKit/Source/WebCore/bindings/js/JSDOMOperation.h:63:9,
    inlined from ‘jsWebSocketPrototypeFunction_send’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WebCore/DerivedSources/JSWebSocket.cpp:588:96:
/home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME/WTF/Headers/wtf/Packed.h:146:15: warning: ‘__builtin_memcpy’ reading 6 bytes from a region of size 0 [-Wstringop-overread]
  146 |         memcpy(&value, m_storage.data(), storageSize);
      |               ^

So it's bug #226557 again, but this time with a different file. Sigh. Probably this warning will have to be turned off globally. I have some relevant discussion with the GCC developers in https://bugzilla.redhat.com/show_bug.cgi?id=2002031#c5.

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