[Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not part of C/C++ standard

[Markus Mützel]

Follow-up Comment #40, bug #61812 (project octave):

I pushed an updated version of the C++ feature detection m4 macro with changes
from upstream here:
https://hg.savannah.gnu.org/hgweb/octave/rev/c8c947e1f05c

I'm still not sure how (or if) we should propagate this to user code that
includes our headers.



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