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

[Rui Ueyama via llvm-dev]

On Tue, Oct 31, 2017 at 2:11 PM, Zachary Turner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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
>

I'd guess that we could do this two-stage bootstrapping automatically using
cmake when cmake finds that the host compiler is too old to compile our
compiler. (And you don't need to install your compiler -- you can just copy
it to some subdirectory in a build directory.)

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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