Details
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Bug
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Resolution: Fixed
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P1: Critical
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6.8.2
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Linux/Wayland,
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72cde6f7d (dev), 7b0e3fb96 (6.9), d746375d9 (6.8)
Description
When building kwin 6.3.0 with Clang 19 and libcpp we're getting the following build error when compiling with "-std=c++23":
In file included from /var/tmp/portage/kde-plasma/kwin-6.3.0/work/kwin-6.3.0/src/osd.cpp:7: In file included from /var/tmp/portage/kde-plasma/kwin-6.3.0/work/kwin-6.3.0/src/osd.h:10: In file included from /usr/include/qt6/QtCore/QFlags:1: In file included from /usr/include/qt6/QtCore/qflags.h:7: /usr/include/qt6/QtCore/qcompare_impl.h:26:49: error: no member named 'is_null_pointer_v' in namespace 'std' 26 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> | ~~~~~^ /usr/include/qt6/QtCore/qcompare_impl.h:26:67: error: 'T' does not refer to a value 26 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> | ^ /usr/include/qt6/QtCore/qcompare_impl.h:26:24: note: declared here 26 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> | ^ /usr/include/qt6/QtCore/qcompare_impl.h:26:77: error: expected member name or ';' after declaration specifiers 26 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> | ^ 3 errors generated.
"is_null_pointer" is provided by "type_traits" but "qcompare_impl.h" does not include it, adding "#include <type_traits>" to "qcompare_impl.h" fixes the issue (as does reverting to C+20). It appears that "qcompare_impl.h" was relying on a transitive include that's no longer included by libcpp when using C+23.
Downstream bug reports:
Attachments
Issue Links
- relates to
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QTQAINFRA-6203 missing gcc 12/13/14 in CI
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- Closed
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