Details
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Bug
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Resolution: Fixed
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P3: Somewhat important
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6.8.1
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macOS
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0711eb607 (dev), fa8effc7d (6.9), 957ce6868 (6.8)
Description
To reproduce the issue:
1. Create a QMake QWidget project from template.
2. Add "QMAKE_CXXFLAGS += -Wzero-as-null-pointer-constant" in .pro file
3. Build the project (or rebuild the project if the project is not freshly built)
4. Quite many "zero as null pointer constant" warnings are printed
Other test being done:
1. It does not reproduce with Windows MinGW
2. It does not reproduce with CMake on macOS (flag passed by target_compile_options)
So it seems that the combination of QMake + macOS causes the problem. The workaround is of course do not add that C++ compiler flag in .pro file but people may need to use it in practice.
In file included from ../../qtcreator/untitled13/main.cpp:1: In file included from ../../qtcreator/untitled13/mainwindow.h:4: In file included from ../../../qt/official/6.8.1/macos/lib/QtWidgets.framework/Headers/QMainWindow:1: In file included from ../../../qt/official/6.8.1/macos/lib/QtWidgets.framework/Headers/qmainwindow.h:8: In file included from /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtWidgets.framework/Headers/qwidget.h:8: In file included from /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtGui.framework/Headers/qwindowdefs.h:8: In file included from /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtCore.framework/Headers/qobjectdefs.h:12: In file included from /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtCore.framework/Headers/qnamespace.h:13: /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtCore.framework/Headers/qcompare.h:226:78: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant] 226 | friend constexpr bool is_eq (partial_ordering o) noexcept { return o == 0; } | ^ | nullptr /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtCore.framework/Headers/qcompare.h:227:78: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant] 227 | friend constexpr bool is_neq (partial_ordering o) noexcept { return o != 0; } | ^ | nullptr /Users/alex/Dev/qt/official/6.8.1/macos/lib/QtCore.framework/Headers/qcompare.h:228:78: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant] 228 | friend constexpr bool is_lt (partial_ordering o) noexcept { return o < 0; } | ^ | nullptr