headersclean: Compile with -std=c++latest, -Zc:__cplusplus on MSVC
c++latest does check that our headers also work with upcoming C++20 support in MSVC. It also implicitly sets -permissive-, which checks for stricter standards compliance. Pick-to: 6.1 Task-number: QTBUG-91117 Change-Id: Iaf1547191969213d570a1b2f59888ad04a7977ab Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
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@ -190,7 +190,7 @@ function(qt_internal_add_headers_clean_target
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elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
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# -Za would enable strict standards behavior, but we can't add it because
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# <windows.h> and <GL.h> violate the standards.
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set(hcleanFLAGS -std:c++17 -WX -W3)
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set(hcleanFLAGS -std:c++latest -Zc:__cplusplus -WX -W3)
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# cl.exe needs a source path
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get_filename_component(source_path "${QT_MKSPECS_DIR}/features/data/dummy.cpp" REALPATH)
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