everything.nix: Add a debug output for convenience

Author: edolstra

packaging/everything.nix

@@ -102,6 +102,7 @@ stdenv.mkDerivation (finalAttrs: {
     "dev"
     "doc"
     "man"
+    "debug"
   ];
 
   /**
@@ -153,9 +154,12 @@ stdenv.mkDerivation (finalAttrs: {
   installPhase =
     let
       devPaths = lib.mapAttrsToList (_k: lib.getDev) finalAttrs.finalPackage.libs;
+      debugPaths = lib.map (lib.getOutput "debug") (
+        lib.attrValues finalAttrs.finalPackage.libs ++ [ nix-cli ]
+      );
     in
     ''
-      mkdir -p $out $dev/nix-support
+      mkdir -p $out $dev/nix-support $debug/lib/debug
 
       # Custom files
       echo $libs >> $dev/nix-support/propagated-build-inputs
@@ -168,6 +172,12 @@ stdenv.mkDerivation (finalAttrs: {
         lndir $lib $dev
       done
 
+      for d in ${lib.escapeShellArgs debugPaths}; do
+        if [[ -d $d/lib/debug ]]; then
+          lndir $d/lib/debug $debug/lib/debug
+        fi
+      done
+
       # Forwarded outputs
       ln -sT ${nix-manual} $doc
       ln -sT ${nix-manual.man} $man