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

[Chris Bieneman via llvm-dev]

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/D28086 <https://reviews.llvm.org/D28086>
https://reviews.llvm.org/D28856 <https://reviews.llvm.org/D28856>
https://reviews.llvm.org/D28855 <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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