[llvm-dev] Python build dependency in LLVM and/or clang?

[David Greene via llvm-dev]

This would be lovely.

                   -David

Chris Bieneman via llvm-dev <llvm-dev at lists.llvm.org> writes:

> LLVM's dependency on Python to *build* is historical, and could actually be removed. We use it for LLVMBuild, which was important back when we had autoconf as
> a method of maintaining library dependency graphs between autoconf and CMake. We could actually remove LLVMBuild and with it the python dependency. There
> was even a few patches a few years back to do it.
>
> See:
>
> https://reviews.llvm.org/D28086https://reviews.llvm.org/D28856
> https://reviews.llvm.org/D28855
>
> -Chris
>
>  On Jul 11, 2019, at 1:53 PM, Tim Northover via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
>  On Thu, 11 Jul 2019 at 21:44, Joerg Sonnenberger via llvm-dev
>  <llvm-dev at lists.llvm.org> wrote:
>
>  That's what I said. The cmake based build system needs it. LIT is
>  optional. It is entirely feasible to have a custom build system and no
>  Python at all. It would be quite painful to break that.
>
>  To be explicit (and correct me if I misstate facts), NetBSD wants to
>  build Clang with minimal dependencies because it's the system
>  compiler. And so it completely replaces our build system with
>  something not far removed from a hard-coded set of build steps to
>  eliminate CMake/make/ninja (maybe you allow make?). Tests are not run
>  (at that stage?) since they do always require Python.
>
>  To be frank, I do not think we should compromise LLVM to support this
>  system. It's just not a realistic thing to impose on an external
>  project: NetBSD's footprint constraints are its choice, and it should
>  bear the burden of supporting them.
>
>  Personally, I support adding Python as a build dependency. Though I'd
>  be interested in seeing responses to Mehdi's comments.
>
>  Cheers.
>
>  Tim.
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