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

[Markus Mützel]

Follow-up Comment #37, bug #61812 (project octave):

@arb: Before the patch, AX_CXX_COMPILE_STDCXX was called without setting any
preference when it comes to GNU extensions.
After the patch, that macro is used to first check for the flags to enable GNU
extensions and only compile without them if that check fails.
What I was trying to write was that we might not need the check for GNU
extensions.
If we removed them, the flags would probably be back to what they were before
the patch with a modern compiler.
For an older compiler, -std=c++17 might be added if configured with
--enable-std-pmr-polymorphic-allocator. For even older compilers, -std=c++11
might be added to the compiler flags. (Or whatever flags the compiler vendor
requires to enable support for C++11.)

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