Details
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Bug
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Resolution: Done
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P2: Important
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6.3.0, 6.4.0
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None
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Windows MSVC 2019 and 2022 C++20
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Windows
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7979665362 (qt/qtbase/dev) 7979665362 (qt/tqtc-qtbase/dev) 53edbb330d (qt/qtbase/6.4) 53edbb330d (qt/tqtc-qtbase/6.4) 53edbb330d (qt/tqtc-qtbase/6.4.1) 53edbb330d (qt/tqtc-qtbase/tqtc/qtinsight-6.4)
Description
A trivial QProperty example fails to compile on MSVC in C++20 mode, with different errors on 2019 and 2022.
#include <QtCore/QProperty> int main(int argc, char* argv[]) { QProperty<int> p; QProperty<int> p2; p.setBinding([&]() { return p2.value(); }); return 0; }
Compiled with:
cl.exe -Iinclude /Zc:__cplusplus -std:c++20 -DQT_CORE_LIB test.cpp lib\Qt6Core.lib
On 2019 I get:
Microsoft (R) C/C++ Optimizing Compiler Version 19.29.30146 for x64 Copyright (C) Microsoft Corporation. All rights reserved. test.cpp C:\qt_install\include\QtCore\qproperty.h(423): error C7595: 'std::source_location::current': call to immediate function is not a constant expression
On 2022 I get:
Microsoft (R) C/C++ Optimizing Compiler Version 19.33.31629 for x64 Copyright (C) Microsoft Corporation. All rights reserved.test.cpp Microsoft (R) Incremental Linker Version 14.33.31629.0 Copyright (C) Microsoft Corporation. All rights reserved./out:test.exe test.obj lib\Qt6Core.lib test.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl QPropertyBindingSourceLocation::QPropertyBindingSourceLocation(struct std::source_location const &)" (__imp_??0QPropertyBindingSourceLocation@@QEAA@AEBUsource_location@std@@@Z) referenced in function main test.exe : fatal error LNK1120: 1 unresolved externals
Both of these can be fixed by changing the "constexpr" to "consteval" in the "constexpr QPropertyBindingSourceLocation(const QT_SOURCE_LOCATION_NAMESPACE::source_location &cppLocation)" constructor in qproperty.h.
Attachments
| For Gerrit Dashboard: QTBUG-106277 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 440126,2 | Use consteval in QT_PROPERTY_DEFAULT_BINDING_LOCATION | tqtc/lts-6.2 | qt/tqtc-qtbase | Status: NEW | 0 | 0 |