gcc will now support -stdlib=libc++, etc

[Ken Cunningham]

Just an interesting FYI that gcc mainline now has support for the 
-stdlib=libc++ flag, and will build software against libc++ using the 
libc++ headers if desired.

https://github.com/gcc-mirror/gcc/commit/662b9c55cf06d3df6682ef865fb2b685820317a9

I'm not certain if this is rolling out in the soon-to-be-released gcc 
10.3, or will wait for gcc-11, but it will be a change in the prevailing 
logic to a degree, and opens up some interesting possibilities.

K