Bug 280642 – Build broken with LLVM 19: Ref.h:62:16: error: member access into incomplete type 'WebCore::HTMLImageElement'

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Michael Catanzaro]

LLVM 19 does not like the forward declarations in WebCodecsVideoFrame.h:

/builddir/build/BUILD/webkitgtk-2.46.1-build/webkitgtk-2.46.1/redhat-linux-build/webkitgtk-6.0/WTF/Headers/wtf/Ref.h:62:16: error: member access into incomplete type 'WebCore::HTMLImageElement'
   62 |             ptr->deref();
      |                ^
/builddir/build/BUILD/webkitgtk-2.46.1-build/webkitgtk-2.46.1/redhat-linux-build/webkitgtk-6.0/WTF/Headers/wtf/RefPtr.h:60:47: note: in instantiation of member function 'WTF::DefaultRefDerefTraits<WebCore::HTMLImageElement>::derefIfNotNull' requested here
   60 |     ALWAYS_INLINE ~RefPtr() { RefDerefTraits::derefIfNotNull(PtrTraits::exchange(m_ptr, nullptr)); }
      |                                               ^
/usr/bin/../lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14/variant:787:33: note: in instantiation of member function 'WTF::RefPtr<WebCore::HTMLImageElement>::~RefPtr' requested here
  787 |   template<typename _Ti> struct _Arr { _Ti _M_x[1]; };
      |                                 ^
/builddir/build/BUILD/webkitgtk-2.46.1-build/webkitgtk-2.46.1/Source/WebCore/Modules/webcodecs/WebCodecsVideoFrame.h:44:7: note: forward declaration of 'WebCore::HTMLImageElement'
   44 | class HTMLImageElement;
      |       ^

This is messy to clean up because we need to include a lot of headers that are currently missing from forwarding headers for unknown reasons, so need to add a bunch of files to Headers.cmake. It seems there are a *lot* of headers missing from Headers.cmake. I will only add those required to make the build succeed for me.

I'm not finished yet.

[Michael Catanzaro]

Pull request: https://github.com/WebKit/WebKit/pull/34508

[Michael Catanzaro]

Unfortunately all the headers need to be added to XCode as well.

[Michael Catanzaro]

Somebody who uses XCode will need to fix this. My pull request should be a good start, though.

[Michael Catanzaro]

Pull request: https://github.com/WebKit/WebKit/pull/35168

[EWS]

Committed 285146@main (bc1be22110c3): <https://commits.webkit.org/285146@main>

Reviewed commits have been landed. Closing PR #35168 and removing active labels.