https://bugs.kde.org/show_bug.cgi?id=499835
Bug ID: 499835
Summary: CMAKE_CXX_STANDARD version too high
Classification: Plasma
Product: kwin
Version: 6.3.0
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: qxghwlz...@protonmail.com
Target Milestone: ---
Hello! I recently compiled the new version of kwin 6.3.0 using clang 19 and
encountered a compilation error
```
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.
```
After figuring out the code a bit, after setting the flag gnu/c++=20 this
section of code compiled fine
SUMMARY
STEPS TO REPRODUCE
1. Have llvm-clang-19 with libcxx{abi}
2. Compile kwin project with default flags
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.13.2-cachyos (64-bit)/6.3.0
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
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