Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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6.2.1
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None
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MSVC 19.29, Windows 10 SDK 10.0.17763.0
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Windows
Description
We are targeting Windows 10 LTSC 2019 (WinSDK 10.0.17763.0), with some of our applications, and are trying to compile Qt for this platform following the instructions here: https://doc.qt.io/qt-6/windows-building.html
That fails with errors like this:
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(487): error C2059: syntax error: '/' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(502): error C2059: syntax error: '/' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(530): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(531): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(533): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(534): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(665): error C2079: 'varDefaultValue' uses undefined struct 'tagVARIANT' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(950): error C2079: 'varValue' uses undefined struct 'tagVARIANT' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(319): error C2059: syntax error: '/' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(378): error C2371: 'pvarVal': redefinition; different basic types C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\oaidl.h(510): note: see declaration of 'pvarVal' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(379): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(380): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(383): error C2059: syntax error: '}' C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\propidlbase.h(384): error C2059: syntax error: '}'
(This particular error comes from qtbase\src\3rdparty\pcre2\src\pcre2_jit_compile.c, but when building with a separately installed PCRE, I have also observed this error somewhere in qtimageformats.)
I think these errors are caused by these WinSDK headers not being fully /permissive--clean (the cause of this error is this macro: #define _VARIANT_BOOL /##/).
So the question is, what can we do about this?
We could build Qt with a newer WinSDK (or use a precompiled version that was built with a newer WinSDK) and hope it doesn't actually use any of the newer functionality so that it will still run on Windows 10 1809, but that approach doesn't exactly inspire confidence...