Details
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Bug
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Resolution: Fixed
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P1: Critical
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6.7.1
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None
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669f7e3b9723446732d31d48b653cd2bd9580f2d (qtbase/dev), dcc482cd01c138e4603a349986f5419b03583c96(qtbase/6.7)
Description
If you compile Qt 6.7.1 with Clang 18 in C++20 mode, you will see the following compilation error:
In file included from /somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/compat/removed_api.cpp:287:
In file included from /somewhere/qt-build/qtbase/include/QtCore/qdir.h:1:
In file included from /somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/io/qdir.h:9:
In file included from /somewhere/qt-build/qtbase/include/QtCore/qfileinfo.h:1:
In file included from /somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/io/qfileinfo.h:11:
In file included from /somewhere/qt-build/qtbase/include/QtCore/qdatetime.h:1:
/somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/time/qdatetime.h:532:19: error: call to constructor of 'QDateTime' is ambiguous
532 | QDateTime result(QDate(1970, 1, 1), QTime(0, 0, 0));
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/time/qdatetime.h:359:5: note: candidate constructor
359 | QDateTime(QDate date, QTime time);
| ^
/somewhere/qt-everywhere-src-6.7.1/qtbase/src/corelib/time/qdatetime.h:363:5: note: candidate constructor
363 | QDateTime(QDate date, QTime time,
| ^
1 error generated.
This is because qtbase/src/corelib/compat/removed_api.cpp defines QT_CORE_BUILD_REMOVED_API, which results in the following code after preprocessing:
QDateTime(QDate date, QTime time);
QDateTime(QDate date, QTime time,
TransitionResolution resolve = TransitionResolution::LegacyBehavior);
It compiles with GCC only by chance because GCC is less thorough in checking code inside the templated function fromStdLocalTime:
template <typename = void>
static QDateTime fromStdLocalTime(const std::chrono::local_time<std::chrono::milliseconds> &time)
{
QDateTime result(QDate(1970, 1, 1), QTime(0, 0, 0));
return result.addMSecs(time.time_since_epoch().count());
}
This godbolt fragment demonstrates the problem: https://godbolt.org/z/4f3x7zo9j
Attachments
Issue Links
- duplicates
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- Closed
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