devel/llvm90 requires math/z3 first; building math/z3 requires a c++ toolchain be in place

[Brooks Davis]

I'd prefer to disable this dependency.  There's a knob that worked in
the 8.0 timeframe, but the lit build now autodetects z3 when it is
present and I've failed to find a knob to disable it.  For now, the easy
workaround is probably to disable options LIT.  We could make that the
default on non-LLVM platforms is that makes sense.

-- Brooks

On Mon, Aug 05, 2019 at 08:45:31PM -0700, Mark Millard via freebsd-toolchain wrote:
> Building math/z3 involves:
> 
> # grep compiler /usr/ports/math/z3/Makefile
> USES=		compiler:c++11-lang python:2.7,build
> 
> But devel/llvm90 requires math/z3 to have been built before
> devel/llvm90 is built:
> 
> # pkg info -d llvm90
> llvm90-9.0.0.r1:
> 	libxml2-2.9.9
> 	z3-4.8.5_1
> 	python36-3.6.9
> 	perl5-5.28.2
> 	libedit-3.1.20190324,1
> # pkg info -B llvm90
> llvm90-9.0.0.r1:
> 	libpython3.6m.so.1.0
> 	libedit.so.0
> 	libz3.so.0
> 	libxml2.so.2
> 
> 
> Hopefully this cycle can be avoided for system
> clang to eventually have progressed to clang 9.
> (I do not know the details.)
> 
> For architectures still at gcc/g++ 4.2.1, some
> alternate c++ tool chain needs to be used to
> build libz3.so but the result needs to be
> compatible with llvm90 later using the libz3.so's
> content. (I do not know the details.)
> 
> ===
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
> 
> _______________________________________________
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