qtwebengine release build looking for debug objects

When building Qt including WebEngine using the attached batch script, the webengine module build fails with 23 unresolved externals:

C:\MC2x64\envs_build\Library\bin\jom.exe -f Makefile.core_module.Release
cl -c -Yc -Fp.pch\release\Qt5WebEngineCore_pch.pch -Fo.pch\release\Qt5WebEngineCore_pch.obj -nologo -Zc:wchar_t -FS -Zc:strictStrings -Zc:throwingNew -O2 -MD -D_HAS_EXCEPTIONS=0 -GR -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -DUNICODE -DWIN32 -DWIN64 -DQT_BUILD_WEBENGINECORE_LIB -DQT_BUILDING_QT -D_CRT_SECURE_NO_WARNINGS -D_USE_MATH_DEFINES -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x040800 -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_WEBCHANNEL_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_QUICK_LIB -DQT_WEBENGINECOREHEADERS_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DNDEBUG -I. -IC:\MC2x64\envs_build\Library\include -I..\3rdparty\chromium -I..\..\include -I..\..\include\QtWebEngineCore -I..\..\include\QtWebEngineCore\5.6.0 -I..\..\include\QtWebEngineCore\5.6.0\QtWebEngineCore -Itmp -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQuick -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtGui -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtANGLE -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQml -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtNetwork -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtwebchannel\include -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtwebchannel\include\QtWebChannel -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtlocation\include -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtlocation\include\QtPositioning -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtCore -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQuick\5.6.0 -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQuick\5.6.0\QtQuick -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtGui\5.6.0 -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtGui\5.6.0\QtGui -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQml\5.6.0 -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtdeclarative\include\QtQml\5.6.0\QtQml -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtCore\5.6.0 -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\include\QtCore\5.6.0\QtCore -IC:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/.moc/release -IC:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\mkspecs\win32-msvc2015 -TP ..\..\include\QtWebEngineCore\QtWebEngineCoreDepends
QtWebEngineCoreDepends
link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /MACHINE:X64 /LIBPATH:"C:\Program\ Files\ (x86)\Windows\ Kits\8.1\Lib\winv6.3\um\x64" /DELAYLOAD:dbghelp.dll /DELAYLOAD:dwmapi.dll /DELAYLOAD:shell32.dll /DELAYLOAD:uxtheme.dll /DELAYLOAD:cfgmgr32.dll /DELAYLOAD:powrprof.dll /DELAYLOAD:setupapi.dll /DELAYLOAD:mf.dll /DELAYLOAD:mfplat.dll /DELAYLOAD:mfreadwrite.dll /DELAYLOAD:BluetoothApis.dll /DELAYLOAD:Bthprops.cpl /DELAYLOAD:dinput8.dll /DELAYLOAD:user32.dll /DELAYLOAD:d3d9.dll /DELAYLOAD:d3d11.dll /DELAYLOAD:dxva2.dll /PDB:C:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\lib\Qt5WebEngineCore.pdb /maxilksize:0x7ff00000 /dynamicbase /ignore:4199 /ignore:4221 /nxcompat /SUBSYSTEM:WINDOWS,5.02 /INCREMENTAL:NO /FIXED:NO /OPT:REF /OPT:ICF /NODEFAULTLIB:olepro32.lib /PROFILE wininet.lib dnsapi.lib version.lib msimg32.lib ws2_32.lib usp10.lib psapi.lib dbghelp.lib winmm.lib shlwapi.lib cfgmgr32.lib powrprof.lib setupapi.lib advapi32.lib kernel32.lib gdi32.lib winspool.lib comdlg32.lib shell32.lib ole32.lib oleaut32.lib user32.lib uuid.lib odbc32.lib odbccp32.lib delayimp.lib credui.lib netapi32.lib /DYNAMICBASE /NXCOMPAT /OPT:REF @C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/api/Release_x64\qtwebenginecoreapi.lib.objects /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.6 /MANIFEST:embed /OUT:..\..\lib\Qt5WebEngineCore.dll @C:\Users\builder\AppData\Local\Temp\Qt5WebEngineCore.dll.8964.2703.jom
Creating library ..\..\lib\Qt5WebEngineCore.lib and object ..\..\lib\Qt5WebEngineCore.exp
qwebengineurlrequestjob.obj : error LNK2019: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::URLRequestCustomJobDelegate::staticMetaObject" (?staticMetaObject@URLRequestCustomJobDelegate@QtWebEngineCore@@2UQMetaObject@@B) referenced in function "public: static class QString __cdecl QtWebEngineCore::URLRequestCustomJobDelegate::tr(char const *,char const *,int)" (?tr@URLRequestCustomJobDelegate@QtWebEngineCore@@SA?AVQString@@PEBD0H@Z)
QtWebEngineCore.url_request_custom_job.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::URLRequestCustomJobDelegate::staticMetaObject" (?staticMetaObject@URLRequestCustomJobDelegate@QtWebEngineCore@@2UQMetaObject@@B)
QtWebEngineCore.url_request_custom_job_delegate.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::URLRequestCustomJobDelegate::staticMetaObject" (?staticMetaObject@URLRequestCustomJobDelegate@QtWebEngineCore@@2UQMetaObject@@B)
QtWebEngineCore.authentication_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QtWebEngineCore::AuthenticationDialogController::metaObject(void)const " (?metaObject@AuthenticationDialogController@QtWebEngineCore@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.authentication_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl QtWebEngineCore::AuthenticationDialogController::qt_metacast(char const *)" (?qt_metacast@AuthenticationDialogController@QtWebEngineCore@@UEAAPEAXPEBD@Z)
QtWebEngineCore.authentication_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl QtWebEngineCore::AuthenticationDialogController::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@AuthenticationDialogController@QtWebEngineCore@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
QtWebEngineCore.authentication_dialog_controller.obj : error LNK2019: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::AuthenticationDialogController::staticMetaObject" (?staticMetaObject@AuthenticationDialogController@QtWebEngineCore@@2UQMetaObject@@B) referenced in function "public: static class QString __cdecl QtWebEngineCore::AuthenticationDialogController::tr(char const *,char const *,int)" (?tr@AuthenticationDialogController@QtWebEngineCore@@SA?AVQString@@PEBD0H@Z)
QtWebEngineCore.resource_dispatcher_host_delegate_qt.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::AuthenticationDialogController::staticMetaObject" (?staticMetaObject@AuthenticationDialogController@QtWebEngineCore@@2UQMetaObject@@B)
QtWebEngineCore.clipboard_qt.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QtWebEngineCore::ClipboardChangeObserver::metaObject(void)const " (?metaObject@ClipboardChangeObserver@QtWebEngineCore@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.clipboard_qt.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl QtWebEngineCore::ClipboardChangeObserver::qt_metacast(char const *)" (?qt_metacast@ClipboardChangeObserver@QtWebEngineCore@@UEAAPEAXPEBD@Z)
QtWebEngineCore.clipboard_qt.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl QtWebEngineCore::ClipboardChangeObserver::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@ClipboardChangeObserver@QtWebEngineCore@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
QtWebEngineCore.file_picker_controller.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QtWebEngineCore::FilePickerController::metaObject(void)const " (?metaObject@FilePickerController@QtWebEngineCore@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.file_picker_controller.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl QtWebEngineCore::FilePickerController::qt_metacast(char const *)" (?qt_metacast@FilePickerController@QtWebEngineCore@@UEAAPEAXPEBD@Z)
QtWebEngineCore.file_picker_controller.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl QtWebEngineCore::FilePickerController::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@FilePickerController@QtWebEngineCore@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
QtWebEngineCore.file_picker_controller.obj : error LNK2019: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::FilePickerController::staticMetaObject" (?staticMetaObject@FilePickerController@QtWebEngineCore@@2UQMetaObject@@B) referenced in function "public: static class QString __cdecl QtWebEngineCore::FilePickerController::tr(char const *,char const *,int)" (?tr@FilePickerController@QtWebEngineCore@@SA?AVQString@@PEBD0H@Z)
QtWebEngineCore.web_contents_delegate_qt.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::FilePickerController::staticMetaObject" (?staticMetaObject@FilePickerController@QtWebEngineCore@@2UQMetaObject@@B)
QtWebEngineCore.gl_context_qt.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl GLContextHelper::metaObject(void)const " (?metaObject@GLContextHelper@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.gl_context_qt.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl GLContextHelper::qt_metacast(char const *)" (?qt_metacast@GLContextHelper@@UEAAPEAXPEBD@Z)
QtWebEngineCore.gl_context_qt.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl GLContextHelper::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@GLContextHelper@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
QtWebEngineCore.javascript_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QtWebEngineCore::JavaScriptDialogController::metaObject(void)const " (?metaObject@JavaScriptDialogController@QtWebEngineCore@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.javascript_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl QtWebEngineCore::JavaScriptDialogController::qt_metacast(char const *)" (?qt_metacast@JavaScriptDialogController@QtWebEngineCore@@UEAAPEAXPEBD@Z)
QtWebEngineCore.javascript_dialog_controller.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl QtWebEngineCore::JavaScriptDialogController::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@JavaScriptDialogController@QtWebEngineCore@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
QtWebEngineCore.javascript_dialog_controller.obj : error LNK2019: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::JavaScriptDialogController::staticMetaObject" (?staticMetaObject@JavaScriptDialogController@QtWebEngineCore@@2UQMetaObject@@B) referenced in function "public: static class QString __cdecl QtWebEngineCore::JavaScriptDialogController::tr(char const *,char const *,int)" (?tr@JavaScriptDialogController@QtWebEngineCore@@SA?AVQString@@PEBD0H@Z)
QtWebEngineCore.javascript_dialog_manager_qt.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QtWebEngineCore::JavaScriptDialogController::staticMetaObject" (?staticMetaObject@JavaScriptDialogController@QtWebEngineCore@@2UQMetaObject@@B)
QtWebEngineCore.javascript_dialog_manager_qt.obj : error LNK2019: unresolved external symbol "public: void __cdecl QtWebEngineCore::JavaScriptDialogController::dialogCloseRequested(void)" (?dialogCloseRequested@JavaScriptDialogController@QtWebEngineCore@@QEAAXXZ) referenced in function "public: virtual void __cdecl QtWebEngineCore::JavaScriptDialogManagerQt::CancelActiveAndPendingDialogs(class content::WebContents *)" (?CancelActiveAndPendingDialogs@JavaScriptDialogManagerQt@QtWebEngineCore@@UEAAXPEAVWebContents@content@@@Z)
QtWebEngineCore.url_request_custom_job_delegate.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl QtWebEngineCore::URLRequestCustomJobDelegate::metaObject(void)const " (?metaObject@URLRequestCustomJobDelegate@QtWebEngineCore@@UEBAPEBUQMetaObject@@XZ)
QtWebEngineCore.url_request_custom_job_delegate.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl QtWebEngineCore::URLRequestCustomJobDelegate::qt_metacast(char const *)" (?qt_metacast@URLRequestCustomJobDelegate@QtWebEngineCore@@UEAAPEAXPEBD@Z)
QtWebEngineCore.url_request_custom_job_delegate.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl QtWebEngineCore::URLRequestCustomJobDelegate::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@URLRequestCustomJobDelegate@QtWebEngineCore@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
..\..\lib\Qt5WebEngineCore.dll : fatal error LNK1120: 23 unresolved externals

Looking higher in the error log, it seems that several debug objects are not being found:

( if not exist Makefile.core_module C:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtbase\bin\qmake C:\MC2x64\conda-bld\work\qt-everywhere-opensource-src-5.6.0\qtwebengine\src\core\core_module.pro -o Makefile.core_module ) && C:\MC2x64\envs_build\Library\bin\jom.exe -f Makefile.core_module release
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.access_token_store_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.authentication_dialog_controller.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.browser_accessibility_manager_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.browser_accessibility_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.browser_context_adapter.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.browser_context_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.certificate_error_controller.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.chromium_gpu_helper.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.chromium_overrides.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.clipboard_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\common\QtWebEngineCore.qt_messages.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\common\QtWebEngineCore.user_script_data.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.content_client_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.content_browser_client_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.content_main_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.cookie_monster_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.custom_protocol_handler.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.delegated_frame_node.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.desktop_screen_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.dev_tools_http_handler_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.download_manager_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.file_picker_controller.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.gl_context_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.gl_surface_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.javascript_dialog_controller.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.javascript_dialog_manager_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.media_capture_devices_dispatcher.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.native_web_keyboard_event_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.network_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.ozone_platform_eglfs.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.permission_manager_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.process_main.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.proxy_config_service_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.qrc_protocol_handler_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.render_view_observer_host_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.render_widget_host_view_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\QtWebEngineCore.content_renderer_client_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\pepper\QtWebEngineCore.pepper_flash_browser_host_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\pepper\QtWebEngineCore.pepper_flash_renderer_host_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\pepper\QtWebEngineCore.pepper_host_factory_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\pepper\QtWebEngineCore.pepper_renderer_host_factory_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\QtWebEngineCore.render_frame_observer_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\QtWebEngineCore.render_view_observer_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\QtWebEngineCore.user_script_controller.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\renderer\QtWebEngineCore.web_channel_ipc_transport.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.resource_bundle_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.resource_context_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.resource_dispatcher_host_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.stream_video_node.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.surface_factory_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.url_request_context_getter_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.url_request_custom_job.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.url_request_custom_job_delegate.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.url_request_qrc_job_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.user_script.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.user_script_controller_host.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_channel_ipc_transport_host.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_contents_adapter.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_contents_delegate_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_contents_view_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_engine_context.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_engine_error.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_engine_library_info.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_engine_settings.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_engine_visited_links_manager.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.web_event_factory.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.yuv_video_node.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\QtWebEngineCore.location_provider_qt.obj
WARNING: Failure to find: C:/MC2x64/conda-bld/work/qt-everywhere-opensource-src-5.6.0/qtwebengine/src/core/Debug_x64/obj\src\core\gen\rcc\QtWebEngineCore.qrc_devtools.obj

Are those debug objects relevant here? I found a build log for what might be the 5.6.0 release here http://testresults.qt.io/coin/logview/qt/qtwebengine/c2687689ba42d6021ae3f220d9fd240609489d3a/WindowsWindows_10x86_64WindowsWindows_10x86_64MSVC2015DebugAndRelease_Release_OpenGLDynamic/de69cf5e84b4dfde72400a7079402be68c75bef2/buildlog.txt.gz and see that the Debug ninja build seems to occur before the linking that kills my build. Is it necessary to always do a debug-and-release build of qtwebengine?

Note: I am applying patches that are attached here to address https://bugreports.qt.io/browse/QTBUG-52367 as well as a strange windows version folder in the windows SDK that does not exist.