Linker error when building with MSVC2019, CMAKE SHARED_CORE=TRUE

[nstrahl]

Greetings everyone,

we are trying to build QtWebkit version 5.212 on windows using cmake and MSVC 2019. We had to set SHARED_CORE option to TRUE to avoid a image size (F85C8000) exceeds maximum allowable size error. The problem is that we are getting a lot of linker errors for Webkit2 as shown in this following snippet:

WebProcessPoolMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebProcessProxyMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebIDBConnectionToServerMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPageQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>DatabaseProcessMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebIDBConnectionToClientMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPageProxyMessageReceiver.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebProcessPoolQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebDragClientQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>CoordinatedLayerTreeHost.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPageCoordinatedGraphics.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>TextCheckerQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebColorPickerQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPageProxyQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPopupMenuProxyQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtWebContext.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtWebPageEventHandler.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtWebPageSGNode.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtWebPageUIClient.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>ItemSelectorContextObject.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>PageViewportControllerClientQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtDialogRunner.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>QtPageClient.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebPageProxyCoordinatedGraphics.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>WebInspectorServerQt.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] 13>StorageManager.obj : error LNK2001: unresolved external symbol "protected: static struct JSC::ClassInfo const WebCore::JSDOMGlobalObject::s_info" (?s_info@JSDOMGlobalObject@WebCore@@1UClassInfo@JSC@@B) [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj] ... C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\bin\Debug\WebKit2.dll : fatal error LNK1120: 206 unresolved externals [C:\vcpkg\buildtrees\qtwebkit\x86-windows-dbg\Source\WebKit2\WebKit2.vcxproj]

The full output file has been attached.
install-x86-windows-dbg-out.log

The options passet to cmake are:
-DPORT=Qt
-DENABLE_API_TESTS=FALSE
-DENABLE_XSLT=FALSE
-DENABLE_TEST_SUPPORT=FALSE
-DCMAKE_BUILD_TYPE=Debug
-DSHARED_CORE=TRUE

I am building with Qt5.15.6 and obtained all other dependencies with vcpkg.

The configuration and compilation works fine. Its the linking where things start to go wrong. I checked the missing symbols and they are indeed contained within the WebCore.lib so I can't understand why the error occurs. Thanks in advance!

[annulen]

If you use SHARED_CORE you are on your own, it's quite likely that nobody have ever tested it with MSVC.

To reduce image size you can follow advises from [1], except static-related things (if you want dlls). In particular, you may want to use ENABLE_WEBKIT2=OFF if you don't use QML/QtQuick APIs, and ENABLE_VIDEO=OFF if you don't need audio/video.

[1] https://github.com/qtwebkit/qtwebkit/wiki/Building-static-libraries

[annulen]

Sorry, I've missed elephant in the room. -DCMAKE_BUILD_TYPE=Debug is what is causing your image size issues. It's highly recommended to use Release builds. If you need debug info and build for 32-bit target, -DUSE_MINIMAL_DEBUG_INFO_MSVC=ON may help. Note that debug builds don't enable optimization by default and will be much slower than release ones.