Drop build hooks in favour of just using bundled libraries properly

The script addition is a bit hacky, but there's no obvious straightforward arch/version-independent way to get most of the build path. And eventually, once issues with HLS etc. are sorted out we will revert to using Cabal hooks anyway.

SetupHooks.hs

@@ -1,33 +0,0 @@
-{-# LANGUAGE DisambiguateRecordFields #-}
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NoFieldSelectors #-}
-
-module SetupHooks (setupHooks) where
-
-import Distribution.Simple.SetupHooks
-import Distribution.Utils.Path
-import System.Directory
-
-setupHooks :: SetupHooks
-setupHooks =
-    noSetupHooks
-        { configureHooks =
-            noConfigureHooks
-                { preConfComponentHook = Just addRustLibDir
-                }
-        }
-
-addRustLibDir :: PreConfComponentInputs -> IO PreConfComponentOutputs
-addRustLibDir inputs = do
-    cwd <- getCurrentDirectory
-    pure
-        (noPreConfComponentOutputs inputs :: PreConfComponentOutputs)
-            { componentDiff =
-                buildInfoComponentDiff
-                    (componentName (component inputs))
-                    emptyBuildInfo
-                        { extraLibDirs =
-                            [ makeSymbolicPath $ cwd </> "rust" </> "target" </> "debug"
-                            ]
-                        }
-            }

garnet.cabal

@@ -6,14 +6,6 @@ author: Patrick Aldis
 maintainer:
     george.thomas@obsidian.systems
     patrick.aldis@obsidian.systems
-build-type: Hooks
-
-custom-setup
-    setup-depends:
-        base,
-        Cabal-hooks,
-        Cabal-syntax,
-        directory,
 
 common common
     default-language: GHC2024

generate-bindings

@@ -9,6 +9,7 @@ set -euo pipefail
 #   1. cargo build       - build the Rust static library
 #   2. cbindgen           - generate a C header from the Rust source
 #   3. awk                - patch the header for hs-bindgen compatibility
+#   4. cp                 - copy static lib
 #
 # System include paths (needed by libclang on NixOS) are detected
 # automatically at TH compile time by GarnetRs.Raw — no env vars needed.
@@ -57,5 +58,10 @@ awk '
 
 echo "  Patched header at $HEADER"
 
+# --- Step 4: Copy static lib for Cabal ---
+#
+# Place library in the location from which Cabal can bundle it.
+cp rust/target/debug/libgarnet_rs.a $(cabal list-bin . | sed -e 's=x/garnet/build/garnet/garnet=build=g')
+
 echo "=== Done ==="
 echo "Run 'cabal run' to test."