Re: [Mesa-dev] [RFC libdrm 0/2] Replace the build system with meson

[Jonathan Gray <jsg@jsg.id.au>]

On Tue, Mar 21, 2017 at 09:22:50AM -0700, Dylan Baker wrote:
> Quoting Jani Nikula (2017-03-21 07:44:55)
> > On Thu, 16 Mar 2017, Dylan Baker <dylan@pnwbakers.com> wrote:
> > > First it's written in python, [...]
> > 
> > How does meson handle python 2 vs. 3? How do you avoid issues in the
> > build files wrt this? On Debian meson seems to depend on python 3, so
> > are they fully python 3?
> 
> Meson requires python 3.4+, and doesn't support python 2. Python 3.4 was
> released in 2012. It's also worth nothing that a couple of us have been working
> to get mesa's python scripts python3 compatible, so in the (hopefully) near
> future python2 wouldn't be required.

Mesa only requires python for development versions not to build
releases.  Changing to a build system that uses python3 to parse JSON
like files to generate ninja would change that.

> 
> > How does meson handle build file backwards compatibility between meson
> > versions? I don't intend to flame, but I've found for some reason many
> > python projects don't seem to take this very seriously. Either having
> > conditionals in build files to support building with several meson
> > versions or always requiring the latest and greatest version would be
> > rather annoying.
> 
> Meson makes backwards compatible changes, and the version can be queried using
> `meson.version()`, which works using meson's version comparison mechanism. I
> would say this about meson, it's not a 'python project', it's 'a project written
> in python', and they've taken great pains to not expose python in meson, and
> reserve the right to reimplement in a different language if python becomes an
> issue.
> 
> 
> > BR,
> > Jani.
> > 
> > -- 
> > Jani Nikula, Intel Open Source Technology Center
> 
> Dylan



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