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build: update AX_CXX_COMPILE_STDCXX to serial 18 #3494

Open patricklodder opened 1 month ago

patricklodder commented 1 month ago

Downloaded the latest version available from https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html at the time of writing. This allows configuring for up to c++20.

Prerequisite for getting c++17 to work because the current version (4) only supports up to c++14.

patricklodder commented 1 month ago

I've added "rebase needed" - although it can be done separately, ideally this goes in after #3492, to run CI over a larger test surface when we touch this kind of stuff.

patricklodder commented 1 month ago

rebased to trigger a c++14 CI run