I am working with clash (haskell -> verilog) compilation the demo project at https://github.com/mheinzel/clash-yosys-demo provides both a nix branch and one using stack.
running
time clash -v --verilog src/Top.hs -outputdir build
takes
- ~ 1m if I run it inside a nix shell, compared to
- ~ 2s if I use the version I installed with
stack install --resolver lts-12.12 clash-ghc
I am very much a Nix beginner and using Nixpkgs, so can anyone give me pointers where to look at why my Nix environment version is so much slower? It seems the linking of used libraries is taking ages (this is what I got from using -v, the verbose flag).