[Interest] Cannot build WebEngine module from Qt 5.6.0 with MSVC 2015

[Michał Urbańczyk]

Hi,
I'm trying to build Qt 5.6.0 using Visual Studio 2015 Update 1. Everything
goes fine except for the webengine module. It compiles for quite a while
before failing. If I skip the webengine module, the whole build succeeds.

The build fails with the same error both with nmake and jom. It happens
both with x64 and Win32 builds.

The sources come from the official 5.6.0 source release. The configure
command I used is:
..\qt_560_src\configure -force-debug-info -developer-build -opensource
-nomake examples -nomake tests -opengl desktop -confirm-license -icu -mp
-qt-zlib -prefix C:\Qt\qt_560_dist_vc14x64

The full log from rerunning the jom command is here:
http://pastebin.com/ftWhNPV5
The excerpt with the first error is below.

Do you have any suggestions on what is the cause and how to solve the
problem?
If there's any more information I should provide, please let me know.

ninja: Entering directory
`C:/Qt/qt_560_build_vc14x64/qtwebengine/src/core/Debug_x64'
    C:\thingsInPath\jom.exe -f Makefile.Debug all
    C:\thingsInPath\jom.exe -f Makefile.Release all
[1/85] ACTION QtWebEngineCore:
moc_file_picker_controller.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[2/85] ACTION QtWebEngineCore:
moc_url_request_custom_job_delegate.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[3/85] ACTION QtWebEngineCore:
moc_clipboard_qt.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[4/85] ACTION QtWebEngineCore:
moc_authentication_dialog_controller.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[5/85] ACTION QtWebEngineCore:
moc_gl_context_qt.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[6/85] ACTION QtWebEngineCore:
location_provider_qt.moc_77b3603f3e0b4538e38cc350a4bda9c0
[7/85] ACTION QtWebEngineCore:
moc_javascript_dialog_controller.cpp_77b3603f3e0b4538e38cc350a4bda9c0
[8/85] ACTION QtWebEngineCore:
web_engine_settings.moc_77b3603f3e0b4538e38cc350a4bda9c0
FAILED: C:\Python27\python.exe gyp-win-tool action-wrapper environment.x64
QtWebEngineCore_target_moc_url_request_custom_job_delegate_cpp_77b3603f3e0b4538e38cc350a4bda9c0..rsp
c:/qt/qt_560_src/qtwebengine\src\core
moc: Cannot open options file specified with @

QCommandLineParser: argument list cannot be empty, it should contain at
least the executable name

Thanks
Best regards,
Michał Urbańczyk
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