I recently downloaded Rtools. I see the g++ version is
gcc version 4.6.3 20111208 (prerelease) (GCC)

I also recently downloaded MinGW. Its version of g++ is
gcc version 4.8.1 (GCC)

I believe that later versions of g++ provide better support for C++11.
Why does Rtools provide a version considerably older than the latest?
Any plans to update the version?
Is it bad practice to compile with a later version when interfacing with R?

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