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

[Markus Mützel]

Follow-up Comment #11, bug #61812 (project octave):

In lo-ieee.h, <cmath> is included before "octave-config.h". That should
probably be changed anyway (and any other files that include headers before
"octave-config.h"). Or is there a good reason why "octave-config.h" is
included after other headers in some files?

@jwe: I searched some forums (stackoverflow and alike) for this topic. Some
users are commenting that "unforeseeable things" might occur if pi is defined
differently in different places. `4.0*atan(1.0)` seems to be used widely to
get the exact PI that is used by the library...

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