[Bug 295767] The C++ feature std::from_chars (with float value) is missing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295767

--- Comment #6 from Matthias Andree <mandree@FreeBSD.org> ---
I should have added that libstdc++ and libc++ are incompatible, ABI-wise.
This is obvious to only some of us discussing here. You can't link, directly or
indirectly, libstdc++ and libc++ into the same executable or shared object
("shared library").

If some typical library port (from ports) exposes C++ ABI, say, SomeRequisiteXX
or SomeRequisite++, is compiled and linked against libc++'s ABI, as I think all
such libraries are (they would use the system's base compiler), you can't use
that library in a project that wants to use libstdc++.  

While you *can* tell GCC-based ports to also use libc++, things fall asunder if
they revolve around GCC's builtins that are sometimes incompatible with our
base system's libc++. Hence my suggestions #1, #3, #4 in the previous comment
to isolate matters from one another.

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