[PyQt] Building PyQt5 on Windows

Wallboy wallboy at wallboy.ca
Wed Jun 7 10:02:28 BST 2017

Uggh... Scratch that. I've been staring at code too long. I was passing 
--verbose to my build.bat script and not to the actual configure.py 
script lol. The error was it could not find win32-msvc2015 spec. My Qt 
5.9 build only had win32-msvc folder in mkspecs. So I just copied the 
ones from the 5.8 build. Then the configure went fine. However nmake did 

When qmake got to QtNetwork.pro:

C2027: use of undefined type 'QSslConfiguration'

On 6/7/2017 12:16 AM, Wallboy wrote:
> I have compiled a custom build of Qt 5.9 and I'm now having an issue 
> running PyQt5 configure.py against it. I'm running the following batch 
> script:
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
> @echo off
> REM Specify location of our qt 5.9 bin w/ qmake and DLLs
> SET PATH=C:\qt5.9build\installfolder\bin;%PATH%
> REM Sets up the environment for compiling with MSVC
> CALL "C:\Program Files (x86)\Microsoft Visual Studio 
> 14.0\VC\vcvarsall.bat" x86
> REM Now call configure
> CALL "C:\Users\Wallboy\AnotherTestEnv\Scripts\python.exe" 
> "C:\Users\Wallboy\Desktop\compilation\PyQt5_gpl-5.9.dev1706061528\configure.py" 
> --sip "C:\Users\Wallboy\AnotherTestEnv\sip.exe" --confirm-license 
> --no-designer-plugin --no-tools --concatenate
> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
> from this folder: C:\Users\Wallboy\Desktop\compilation\pyqt5-build
> I get the "Failed to determine the detail of your Qt Installation". Of 
> course I tried again with --verbose, but that gives absolutely zero 
> more information
> So for testing purposed I tried changing SET 
> PATH=C:\qt5.9build\installfolder\bin;%PATH% to SET 
> PATH=C:\Qt\Qt5.8.0-32bit\5.8\msvc2015\bin;%PATH% where those were the 
> official Qt 5.8 binaries, and the configure worked just fine then.
> When I built Qt 5.9 I skipped all submodules except qtbase, 
> qtwebchannel, qtdeclarative, qtwebengine, qtquickcontrols, 
> qtquickcontrols2 as well as used the flags -nomake tools, examples, tests
> So I'm wondering if I skipped building some dependency that PyQt5 
> needs to configure it's build?
> On 6/4/2017 6:42 AM, Phil Thompson wrote:
>> On 4 Jun 2017, at 12:57 pm, Wallboy <wallboy at wallboy.ca> wrote:
>>> No, I thought maybe the DLLs were different then the ones Qt 
>>> provides. What are those DLL files in the /release directories for 
>>> then if we just use Qt's already built DLLs?
>> Those are the Python extension modules.
>>> I have added Qt's bin folder to my PATH env and my programs seem to 
>>> be working. However in my IDE (PyCharm), I am still getting 
>>> Unresolved reference warnings on all my PyQt5.* imports. Though 
>>> PyQt5 is working even with the warnings. I'm not sure if this is a 
>>> virtualenv / PyCharm quirk? I do have the correct interpreter 
>>> selected. Any ideas?
>>> Also one other question. What would happen if I tried to build PyQt5 
>>> against the newest 5.9 Qt binaries? The entire reason I'm doing all 
>>> this for a custom build, is that I need to disable WebRTC in 
>>> QtWebEngine (this is now doable as of 5.9 using -no-webrtc in 
>>> configure).
>> PyQt5 will build against Qt v5.9 as expected.
>>> Would it be possible to build just the WebEngine module for 5.9 and 
>>> overwrite the QWeb*.dll files with the 5.9 ones? (Though I'm 
>>> guessing -no-webrtc only affects the chromium QtWebEngineProcess.exe 
>>> binary) Or is this just asking for trouble...
>>> I'm not sure how the QWeb*.pyd and QWeb*.dll files work with one 
>>> another. I'm guessing it just glues together the python function 
>>> names to the actual C++ function names? If that's the case, and I 
>>> use a newer DLL file, then I just wouldn't have access to any new 
>>> functions that might have got added correct? Though I'm sure it's 
>>> not that simple...
>> Phil
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