Consider linking tbb statically

[rui314]

Consider linking tbb statically

[rui314]

I made a change to static-link oneTBB by default. Let's see how it works.

[Logarithmus]

Maybe we could go away without tbb altogether? https://news.ycombinator.com/item?id=26246849

[gjimye]

Maybe we could go away without tbb altogether? https://news.ycombinator.com/item?id=26246849

gcc and clang's stdlib parallel STL implementation uses tbb as a backing (it was donated by Intel), and you need -ltbb to get parallel execution...

[rui314]

And C++ standard library doesn't provide parallel containers such as concurrent_hash_map, so even if we use STL for parallel for loop, we still need TBB.

[rui314]

Statically linking TBB makes sense in most cases, and subtree-ing the TBB repo may be a good idea. TBB comes with different versions, and it is not very likely that a system already has a required version of TBB.

We need an escape hatch to use system-wide TBB library for distros that don't want to link TBB statically, though.