Solved
C++ 17 in STM32CubeIDE 1.5.0
In the new version of IDE, it became possible to select different toolchains. I updated GNU Tools to the latest version available, but C ++ 17 never showed up in the list of available ones.
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The drop-down lists probably don't know about the toolcahin features, this could be fixed.
Workaround: In the g++ tool settings, choose GCC default as language option and specify -std=c++17 under Miscellaneous.
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