nix: use current ghc for tools in the shell

Theses tools are pulled in the shell, but we don't need them to match
the GHC version used for development. Said otherwise, as long as we use
a working `cabal-install` to build with GHC 9.2, we don't care if that
cabal-install was built with GHC 8.10.

This gives more chance for theses tools to work and be in the binary
cache of nixpkgs.

Author: guibou

flake.nix

@@ -251,22 +251,32 @@
                   removeAttrs hlsSources ghc921Config.disabledPlugins
                 else
                   hlsSources));
-            buildInputs = [ gmp zlib ncurses capstone tracy (gen-hls-changelogs hpkgs) pythonWithPackages ]
-              ++ (with hpkgs; [
-                cabal-install
-                hie-bios
+            # For theses tools packages, we use ghcDefault
+            # This removes a rebuild with a different GHC version
+            # Theses programs are tools, used as binary, independently of the
+            # version of GHC.
+            # The drawback of this approach is that our shell may pull two GHC
+            # version in scope (the `ghcDefault` one, and the one defined in
+            # `hpkgs`.)
+            # The advantage is that we won't have to rebuild theses tools (and
+            # dependencies) with a recent GHC which may not be supported by
+            # them.
+            buildInputs = [ gmp zlib ncurses capstone tracy (gen-hls-changelogs ghcDefault) pythonWithPackages ]
+              ++ [
+                pkgs.cabal-install
+                ghcDefault.hie-bios
                 hlint
                 # ormolu
                 # stylish-haskell
-                opentelemetry-extra
-              ]);
+                ghcDefault.opentelemetry-extra
+              ];
 
             src = null;
             shellHook = ''
               export LD_LIBRARY_PATH=${gmp}/lib:${zlib}/lib:${ncurses}/lib:${capstone}/lib
               export DYLD_LIBRARY_PATH=${gmp}/lib:${zlib}/lib:${ncurses}/lib:${capstone}/lib
               export PATH=$PATH:$HOME/.local/bin
-              ${if hpkgs.ghc.version != "9.0.1" then (pre-commit-check hpkgs).shellHook else ""}
+              ${(pre-commit-check ghcDefault).shellHook}
             '';
           };
         # Create a hls executable