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

[A.R. Burgers]

Follow-up Comment #33, bug #61812 (project octave):

The changeset from https://hg.savannah.gnu.org/hgweb/octave/rev/9c98df2035a3
disables C++17 features (setting HAVE_CXX17=0) unless
--enable-std-pmr-polymorphic-allocator is enabled. For instance the
std::variant trials from bug#61800, using gcc 11.2, now only compiles with
--enable-std-pmr-polymorphic-allocator, where as previously it compiled
independently from the polymorphic allocator. Not a big deal, but a heads-up.

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