[llvm-dev] Can lit be upgraded to assume Python 2.7?

Brian Cain via llvm-dev llvm-dev at lists.llvm.org
Wed Feb 24 18:11:36 PST 2016

On Feb 24, 2016 2:59 PM, "Justin Bogner via llvm-dev" <
llvm-dev at lists.llvm.org> wrote:
> Renato Golin via llvm-dev <llvm-dev at lists.llvm.org> writes:
> > On 24 February 2016 at 19:49, Sean Silva via llvm-dev
> > <llvm-dev at lists.llvm.org> wrote:
> >> Great! I'll circle around to this at some point. Despite the "obvious"
> >> nature of it I still am wary of underestimating the cruftiness of the
> >> buildbots, so I'll probably do it some time at night when the bots are
> >> mostly green so that I can easily see if any bots *are* broken by this.
> >
> > While at it, can you call "env python2" in the shebang line? It makes
> > it a lot easier for Python3 systems, like Arch.
> This is dangerous. I believe it's still the case that many systems don't
> provide a "python2", but only python, python2.6, python2.7, etc.

It's possible to implement such that it executes as expected in python3 or
python 2.  Is anyone already working on that?  If not, I'd be willing to
see what it takes.

If successful, it would probably be appropriate to put just "env python" in
the shebang.

Note that straddling 2 and 3 is significant ly easier if you can safely
assume 2.7.
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