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[Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not par


From: Markus Mützel
Subject: [Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not part of C/C++ standard
Date: Thu, 13 Jan 2022 11:23:54 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36 Edg/97.0.1072.55

Update of bug #61812 (project octave):

                  Status:                    None => In Progress            

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Follow-up Comment #4:

The correct "appropriate feature test macro" seems to be:

#define _XOPEN_SOURCE 700


See:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_02_01_02

It looks like this also works on Windows. And it is POSIX conform IIUC.

I'll prepare a patch.

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  <https://savannah.gnu.org/bugs/?61812>

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