[llvm-dev] Using C++14 code in LLVM

[Zachary Turner via llvm-dev]

Note that we could, in theory, provide a python script or something called
`bootstrap.py` which

a) downloads a source tarball, or specific git revision for a particular
clang release
b) compiles it using system compiler
c) installs it
d) cleans up

so that you wouldn't have to do anything manually.  The script could
early-out if it detects a recent enough compiler version so that
bootstrapping was unnecessary.  I think this would hide much of the
complexity about having to deal with getting a modern toolchain, so that
the workflow would be:

1) check out LLVM ToT
2) run bootstrap.py
3) build
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