Re: CVS commit: src

[maya%netbsd.org@localhost]

On Tue, Jan 01, 2019 at 03:34:47PM +0100, Martin Husemann wrote:
> On Tue, Jan 01, 2019 at 02:22:54PM +0000, maya%netbsd.org@localhost wrote:
> > I'm stuck between the hammer and the anvil here.
> > I'd like NetBSD to use a recent MesaLib, the kind that uses LLVM.
> 
> Can you explain how the MesaLib build uses llvm?
> 
> This kinda sounds like you need a special build time binary that would
> live in $TOOLDIR and it is not exactly clear how installing some headers
> helps building this tool (as you can not assume a NetBSD build host).
> 
> Martin

I haven't dug up too much into it in the past, so this was fun to
discover:

MesaLib is a compiler for turning agnostic representations like GLSL and
SPIR-V into hardware appropriate ones. It has passes and intermediate
formats (plural!) and everything.

AMD drivers use LLVM as a step in the process, they defined an AMDGPU as
a target architecture.

I'm not sure how a JIT works, but swrast uses LLVM for its JIT.

at least on the pkgsrc build, swrast and radeonsi are dynamically linked
with libLLVM.