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Prevent -feature-c++20 on VxWorks

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The way that Qt checks if C++20 is supported by the platform does not
work properly on VxWorks.
Their toolchain accepts the C++20 switch, because they use clang with a
wrapper around it, that (for the time being) does not reject it.
The compiler itself claims that it does support C++20.
The problem is that the standard library available on VxWorks only
supports C++17.
This leads to Qt falsely believing that C++20 is supported.
This is being discussed as a defect in support case 00152044.

Prevent weird compilation errors by failing early if the user passes
-feature-c++20 to the configure call.

Task-number: QTBUG-115777
Pick-to: 6.7 6.8
Change-Id: Ica6686428b01a0638117f853586313be63e5fe99
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
This commit is contained in:
Łukasz Matysiak 2024-07-23 12:53:09 +02:00
parent 4f39704602
commit a578a09a41
1 changed files with 1 additions and 1 deletions
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2
configure.cmake
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@ -736,7 +736,7 @@ qt_feature_config("plugin-manifests" QMAKE_PUBLIC_CONFIG
qt_feature("c++20" PUBLIC
LABEL "C++20"
AUTODETECT OFF
CONDITION TEST_cxx20
CONDITION TEST_cxx20 AND NOT VXWORKS
)
qt_feature_config("c++20" QMAKE_PUBLIC_QT_CONFIG)
qt_feature("c++2a" PUBLIC