Details
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Bug
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Resolution: Done
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P2: Important
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5.15.2, 6.2.2, 6.3.0 Alpha
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None
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C++20 / Clang / MSVC
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Windows
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806ba27419 (qt/qtbase/dev) 806ba27419 (qt/tqtc-qtbase/dev) 692c075c8c (qt/qtbase/6.2) 8576b7aab4 (qt/tqtc-qtbase/5.15) 37d4e9c8ad (qt/qtbase/6.3) 692c075c8c (qt/tqtc-qtbase/6.2) 37d4e9c8ad (qt/tqtc-qtbase/6.3)
Description
Compiling pretty much any Qt widgets application fails with Qt in namespace in C++20 mode, because it can't find anything in the std namespace. The reason is that qopengl.h has a #include <stddef.h> inside QT_BEGIN_NAMESPACE, and apparently stddef now declares something in the std namespace. The include should be wrapped in QT_BEGIN_INCLUDE_NAMESPACE.