nh2 / link-with-lld-example

Example how to link Haskell programs very quickly with lld

Linking with lld in Haskell builds

10x faster than ld in the linkin steps, 3x faster than gold.

Use cabal configure --with-gcc=clang --with-ld=clang, then cabal build.

See the .cabal file for what options are needed.

Bugs

cabal bugs that prevent using lld in the library linking step:

• cabal does not respect ghc-options for -pgmc, -pgml etc

You can't currently use lld correctly in nix because of this bug:

• LLD linker does not have required nixpkgs wrapper script and flags