Start from qt5.14.1, I can't build qtwebengine success, but no problem on qt5.14.0 and previous version.

The following is compile log:

Pass 2: Interval #2, time = 83.234s
Final: Total time = 238.875s
copy /y ..\..\lib\Qt5WebEngineCored.dll ..\..\bin
已复制 1 个文件。
cd process\ && ( if not exist Makefile F:\Qt\Qt5.14.2\5.14.2\msvc2017\bin\qmake.exe -o Makefile F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\process\process.pro ) && "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile

Microsoft (R) 程序维护实用工具 14.16.27038.0 版
版权所有 (C) Microsoft Corporation。 保留所有权利。

"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile.Release all

Microsoft (R) 程序维护实用工具 14.16.27038.0 版
版权所有 (C) Microsoft Corporation。 保留所有权利。

rc /NOLOGO -DUNICODE -D_UNICODE -DWIN32 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -DQT_NO_LINKED_LIST -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DNDEBUG -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_QMLMODELS_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -fo .obj\release\QtWebEngineProcess_resource.res QtWebEngineProcess_resource.rc
cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zc:__cplusplus -O2 -Zi -MD -std:c++17 -utf-8 /wd4530 /wd4577 -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 /Fd.obj\release\QtWebEngineProcess.vc.pdb -DUNICODE -D_UNICODE -DWIN32 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -DQT_NO_LINKED_LIST -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DNDEBUG -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_QMLMODELS_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\process -I. -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\core -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium -I..\core\release\gen -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtGui -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtANGLE -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtCore -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\include\QtWebEngineCore\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\include\QtWebEngineCore\5.14.2\QtWebEngineCore -I..\..\include\QtWebEngineCore\5.14.2 -I..\..\include\QtWebEngineCore\5.14.2\QtWebEngineCore -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\include -IF:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\include\QtWebEngineCore -I..\..\include -I..\..\include\QtWebEngineCore -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQuick\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQuick\5.14.2\QtQuick -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQmlModels\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQmlModels\5.14.2\QtQmlModels -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQml\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQml\5.14.2\QtQml -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtGui\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtGui\5.14.2\QtGui -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtCore\5.14.2 -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtCore\5.14.2\QtCore -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQuick -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQmlModels -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtWebChannel -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtQml -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtNetwork -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\include\QtPositioning -I.moc\release -I/include -I/include -IC:\opensslx86\include -IC:\Utils\my_sql\mysql-5.7.25-win32\include -IC:\Utils\postgresqlx86\pgsql\include -IF:\Qt\Qt5.14.2\5.14.2\msvc2017\mkspecs\win32-msvc -Fo.obj\release\ @C:\Users\15862\AppData\Local\Temp\nm4DBD.tmp
main.cpp
support_win.cpp
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(147): warning C4100: “pc2”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(147): warning C4100: “pc1”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(146): warning C4100: “owner”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(146): warning C4100: “handle”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(149): warning C4100: “pc2”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(149): warning C4100: “pc1”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(148): warning C4100: “owner”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\3rdparty\chromium\base/win/scoped_handle.h(148): warning C4100: “handle”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\process\support_win.cpp(167): warning C4100: “argv”: 未引用的形参
F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\src\process\support_win.cpp(167): warning C4100: “argc”: 未引用的形参
正在生成代码...
link /NOLOGO /DYNAMICBASE /NXCOMPAT /OPT:REF /OPT:ICF /INCREMENTAL:NO /FIXED:NO /PROFILE /WX /OPT:ICF /OPT:REF /cgthreads:8 /LTCG /MACHINE:X86 /SAFESEH /largeaddressaware /FIXED:NO /ignore:4199 /ignore:4221 /NXCOMPAT /DYNAMICBASE /time /verbose:incr /INCREMENTAL:NO /SUBSYSTEM:CONSOLE,5.01 /DELAYLOAD:cfgmgr32.dll /DELAYLOAD:powrprof.dll /DELAYLOAD:setupapi.dll /NATVIS:F:/Qt/Qt5.14.2/5.14.2/Src/qtwebengine/src/3rdparty/chromium/tools/win/DebugVisualizers/chrome.natvis /MANIFESTINPUT:F:/Qt/Qt5.14.2/5.14.2/Src/qtwebengine/src/process/process.exe.manifest /LARGEADDRESSAWARE /DEBUG /OPT:REF /INCREMENTAL:NO /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /VERSION:5.14 /MANIFEST:embed /OUT:..\..\bin\QtWebEngineProcess.exe @C:\Users\15862\AppData\Local\Temp\nm57FF.tmp
正在创建库 ..\..\bin\QtWebEngineProcess.lib 和对象 ..\..\bin\QtWebEngineProcess.exp
LibDef: Total time = 0.094s
LINK : 已指定 /LTCG，但不需要生成代码；从链接命令行中移除 /LTCG 以提高链接器性能
qtmain.lib(qtmain_win.obj) : warning LNK4099: 未找到 PDB“qtmain.pdb”(使用“qtmain.lib(qtmain_win.obj)”或在“F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\build\bin\qtmain.pdb”中寻找)；正在链接对象，如同没有调试信息一样
Wait PDB close: Total time = 0.000s
Wait type merge: Total time = 0.000s
LINK : error LNK1218: 警告被视为错误；未生成输出文件
Final: Total time = 0.781s
NMAKE : fatal error U1077: “"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x86\link.EXE"”: 返回代码“0x1003”
Stop.
NMAKE : fatal error U1077: “"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"”: 返回代码“0x2”
Stop.
NMAKE : fatal error U1077: “cd”: 返回代码“0x2”
Stop.
NMAKE : fatal error U1077: “cd”: 返回代码“0x2”
Stop.

F:\Qt\Qt5.14.2\5.14.2\Src\qtwebengine\build>