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

[Markus Mützel]

Follow-up Comment #23, bug #61812 (project octave):

I don't know how to check for all of the XSI/POSIX extensions over ISO C/C++
that we might be using.

Afaict, the only header that uses any of those extensions from the <math.h> or
<cmath> header is `oct-cmplx.h`.

Removing those extensions from the public facing headers would also be a
possible alternative IIUC. In that case, projects using Octave header files
wouldn't necessarily need to be XSI compatible either.

It might still be a good idea to `#define _XOPEN_SOURCE 700` when we compile
Octave (to comply to the POSIX spec). Maybe that could be done in
`oct-conf-post-private.h` on the default branch?

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