wip: add structured attrs support (broken gcc)

tidepool/src/builders/basic.nix

@@ -52,7 +52,14 @@ in
 
         sorted = lib.dag.sort.topological phases;
 
-        script = lib.strings.concatMapSep "\n" (entry: entry.value) sorted.result;
+        script = lib.strings.concatMapSep "\n"
+          (entry:
+            ''
+              # Phase: ${entry.name}
+              ${entry.value}
+            ''
+          )
+          sorted.result;
 
         executable =
           if system == "i686-linux" then
@@ -74,7 +81,7 @@ in
             inherit (package) name;
             inherit script system;
 
-            passAsFile = [ "script" ];
+            __structuredAttrs = true;
 
             SHELL = executable;
 
@@ -112,6 +119,8 @@ in
             args = [
               "-e"
               (builtins.toFile "bash-builder.sh" ''
+                source $NIX_ATTRS_SH_FILE
+
                 export CONFIG_SHELL=$SHELL
 
                 # Normalize the NIX_BUILD_CORES variable. The value might be 0, which
@@ -124,7 +133,16 @@ in
                 fi
                 export NIX_BUILD_CORES
 
-                bash -eux $scriptPath
+                # Outputs is an associative array of output names to paths
+                for name in "''${!outputs[@]}"; do
+                  eval "export ''${name//-/_}=\"''${outputs[$name]}\""
+                done
+
+                # We have the raw script text in an environment variable named "script". Now
+                # we need to run those commands.
+                echo "$script" > .build.sh
+
+                bash .build.sh
               '')
             ];
           }