[Octave-bug-tracker] [bug #63633] SUNDIALS 6.5.0 requires C++14

[Markus Mützel]

Follow-up Comment #2, bug #63633 (project octave):

We are using `AX_CXX_COMPILE_STDCXX(11, [], mandatory)` in our configure
script. IIUC, that checks for some C++11 features first without any
`-std=c++**` or `-std=gnu++**` flag. If that fails, it tries to add
`-std=gnu++11` to the flags and tries again.

Presumably, the version of Apple clang on the CI runners needs a flag for
C++11 features.


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