When I am building webcore in debug mode, the build failed ../../lib/libWPEWebKit.so.0.0.1: error: undefined reference to 'WebCore::Frame::isMainFrame() const' The issue may be introduced by https://bugs.webkit.org/show_bug.cgi?id=150416 Since Frame::isMainFrame() is inline function defined in MainFrame.h, The change from 150416 introduced in DEBUG mode a reference to isMainFrame without using #include "MainFrame.h" Adding the following lines in Source/WebCore /rendering/RenderObject.cpp resolved the build failure. diff --git a/Source/WebCore/rendering/RenderObject.cpp b/Source/WebCore/rendering/RenderObject.cpp index 8b74a66..5365daa 100644 --- a/Source/WebCore/rendering/RenderObject.cpp +++ b/Source/WebCore/rendering/RenderObject.cpp @@ -72,6 +72,9 @@ #include <algorithm> #include <stdio.h> #include <wtf/RefCountedLeakCounter.h> +#ifndef NDEBUG +#include "MainFrame.h" +#endif
Nowadays isMainFrame() is defined in page/Frame.h, which is always included by RenderObject.h (and therefore by RenderObject.cpp). I have made debug builds without any issues recently, so I am confident that this issue is not a problem anymore → Closing.