add bootstraped x86_64-linux cross compiled gcc (#8)

Work in progress cross compiler for x86_64. I've managed to get a full x86_64 gcc using the binaries built from foundation, and am working on implementing their builds into tidepool.

### Bootstrapping steps
0) Start with i686 tools (gcc, binutils, musl, etc)
1) Build binutils targeting x86_64-linux
2) Build a minimal gcc cross compiler using the cross binutils. This minimal cross compiler does not have support for libc, so is pretty much only useful for building musl or glibc.
3) Use the minimal cross compiler to build x86_64-linux glibc or musl
4) Now that we have a cross compiler and x86_64-linux libc, we can build gcc for the target architecture!
5) Profit! We can now build anything x86_64 using our gcc compiler!

Co-authored-by: Jake Hamilton <jake.hamilton@hey.com>
Reviewed-on: #8
Reviewed-by: Jake Hamilton <jake.hamilton@hey.com>
Co-authored-by: Victor Fuentes <vmfuentes64@gmail.com>
Co-committed-by: Victor Fuentes <vmfuentes64@gmail.com>

format.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -I "nixpkgs=https://github.com/nixos/nixpkgs/archive/nixos-24.05.tar.gz" -p nixfmt-rfc-style
+#!nix-shell -i bash -I "nixpkgs=https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz" -p nixfmt-rfc-style
 
 files=$(find . -name "*.nix" -type f)
 

foundation/flake.lock

@@ -3,17 +3,18 @@
     "lib": {
       "locked": {
         "dir": "lib",
-        "dirtyRev": "2be3111b2c0911f40b47fe0a1fb22b5f5188cf59-dirty",
-        "dirtyShortRev": "2be3111-dirty",
-        "lastModified": 1719251485,
-        "narHash": "sha256-63NvfFVeTDITfNu60rmCUlaZtAeZUnvrIaOLSk9ScC8=",
+        "lastModified": 1723737980,
+        "narHash": "sha256-1WnFatW5kSuO2jjt62hvSbH84TSYyO+VmvkJ0d5e/ZY=",
+        "ref": "master",
+        "rev": "cadfaabc853d20f2bc20bad794fcbe520ea48f13",
+        "revCount": 82,
         "type": "git",
-        "url": "file:../?dir=lib"
+        "url": "file:../"
       },
       "original": {
         "dir": "lib",
         "type": "git",
-        "url": "file:../?dir=lib"
+        "url": "file:../"
       }
     },
     "root": {

lib/src/dag/default.nix

@@ -95,7 +95,7 @@ lib: {
       ## Create a new DAG entry.
       ##
       ## @type List String -> List String -> a -> { before :: List String, after :: List String, value :: a }
-      between = before: after: value: { inherit before after value; };
+      between = after: before: value: { inherit before after value; };
 
       ## Create a new DAG entry with no dependencies.
       ##
@@ -105,12 +105,12 @@ lib: {
       ## Create a new DAG entry that occurs before other entries.
       ##
       ## @type List String -> a -> { before :: List String, after :: List String, value :: a }
-      before = before: lib.dag.entry.between before [ ];
+      before = before: lib.dag.entry.between [ ] before;
 
       ## Create a new DAG entry that occurs after other entries.
       ##
       ## @type List String -> a -> { before :: List String, after :: List String, value :: a }
-      after = lib.dag.entry.between [ ];
+      after = after: lib.dag.entry.between after [ ];
     };
 
     entries = {
@@ -121,7 +121,7 @@ lib: {
         tag:
         let
           process =
-            i: before: after: entries:
+            i: after: before: entries:
             let
               name = "${tag}-${builtins.toString i}";
               entry = builtins.head entries;
@@ -130,7 +130,7 @@ lib: {
             if builtins.length entries == 0 then
               { }
             else if builtins.length entries == 1 then
-              { "${name}" = lib.dag.entry.between before after entry; }
+              { "${name}" = lib.dag.entry.between after before entry; }
             else
               { "${name}" = lib.dag.entry.after after entry; } // (process (i + 1) before [ name ] rest);
         in
@@ -144,12 +144,12 @@ lib: {
       ## Create a DAG from a list of entries, prefixed with a tag, that occurs before other entries.
       ##
       ## @type String -> List String -> List a -> Dag a
-      before = tag: before: lib.dag.entries.between tag before [ ];
+      before = tag: before: lib.dag.entries.between tag [ ] before;
 
       ## Create a DAG from a list of entries, prefixed with a tag, that occurs after other entries.
       ##
       ## @type String -> List String -> List a -> Dag a
-      after = tag: lib.dag.entries.between tag [ ];
+      after = tag: after: lib.dag.entries.between tag after [ ];
     };
   };
 }

lib/src/lists/default.nix

@@ -224,5 +224,11 @@ lib: {
         filter = result: value: if builtins.elem value result then result else result ++ [ value ];
       in
       builtins.foldl' filter [ ] list;
+
+    ## Flatten a list of lists into a single list.
+    ##
+    ## @type List (List a) -> List a
+    flatten =
+      value: if builtins.isList value then builtins.concatMap lib.lists.flatten value else [ value ];
   };
 }

lib/src/types/default.nix

@@ -49,18 +49,18 @@ lib: {
     ##
     ## @type Attrs -> Attrs
     create =
-      settings@{
-        name,
-        description ? name,
-        fallback ? { },
-        check ? lib.fp.const true,
-        merge ? lib.options.merge.default,
-        functor ? lib.types.functor name,
-        mergeType ? lib.types.merge functor,
-        getSubOptions ? lib.fp.const { },
-        getSubModules ? null,
-        withSubModules ? lib.fp.const null,
-        children ? { },
+      settings@{ name
+      , description ? name
+      , fallback ? { }
+      , check ? lib.fp.const true
+      , merge ? lib.options.merge.default
+      , functor ? lib.types.functor name
+      , mergeType ? lib.types.merge functor
+      , getSubOptions ? lib.fp.const { }
+      , getSubModules ? null
+      , withSubModules ? lib.fp.const null
+      , children ? { }
+      ,
       }:
       {
         __type__ = "type";
@@ -108,7 +108,7 @@ lib: {
           identifier = lib.options.getIdentifier location;
           first = builtins.elemAt definitions 0;
 
-          files = builtins.map lib.modules.getFiles definitions;
+          files = lib.modules.getFiles definitions;
           serializedFiles = builtins.concatStringsSep " and " files;
 
           getType =
@@ -118,13 +118,16 @@ lib: {
             else
               builtins.typeOf value;
 
-          commonType = builtins.foldl' (
-            type: definition:
-            if getType definition.value != type then
-              builtins.throw "The option `${identifier}` has conflicting definitions in ${files}"
-            else
-              type
-          ) (getType first.value) definitions;
+          commonType = builtins.foldl'
+            (
+              type: definition:
+                if getType definition.value != type then
+                  builtins.throw "The option `${identifier}` has conflicting definitions in ${serializedFiles}"
+                else
+                  type
+            )
+            (getType first.value)
+            definitions;
 
           mergeStringifiableAttrs = lib.options.merge.one;
 
@@ -132,7 +135,7 @@ lib: {
 
           mergeList =
             if builtins.length definitions > 1 then
-              builtins.throw "The option `${identifier}` has conflicting definitions in ${files}"
+              builtins.throw "The option `${identifier}` has conflicting definitions in ${serializedFiles}"
             else
               (lib.types.list.of lib.types.any).merge;
 
@@ -140,10 +143,12 @@ lib: {
             location: definitions: x:
             let
               resolvedLocation = location ++ [ "<function body>" ];
-              resolvedDefinitions = builtins.map (definition: {
-                __file__ = definition.__file__;
-                value = definition.value x;
-              }) definitions;
+              resolvedDefinitions = builtins.map
+                (definition: {
+                  __file__ = definition.__file__;
+                  value = definition.value x;
+                })
+                definitions;
             in
             lib.types.any.merge resolvedLocation resolvedDefinitions;
 
@@ -200,14 +205,15 @@ lib: {
         ## @type Int -> Int -> Attrs
         between =
           start: end:
-          assert lib.errors.trace (
-            start <= end
-          ) "lib.types.ints.between start must be less than or equal to end";
-          lib.types.withCheck lib.types.int (value: value >= start && value <= end)
-          // {
-            name = "IntBetween";
-            description = "integer between ${description start end}";
-          };
+            assert lib.errors.trace
+              (
+                start <= end
+              ) "lib.types.ints.between start must be less than or equal to end";
+            lib.types.withCheck lib.types.int (value: value >= start && value <= end)
+            // {
+              name = "IntBetween";
+              description = "integer between ${description start end}";
+            };
 
         ## Create a type that allows an integer value between a given range with a specific
         ## number of bits.
@@ -317,14 +323,15 @@ lib: {
         ## @type Int -> Int -> Attrs
         between =
           start: end:
-          assert lib.errors.trace (
-            start <= end
-          ) "lib.types.numbers.between start must be less than or equal to end";
-          lib.types.withCheck lib.types.number (value: value >= start && value <= end)
-          // {
-            name = "NumberBetween";
-            description = "numbereger between ${description start end}";
-          };
+            assert lib.errors.trace
+              (
+                start <= end
+              ) "lib.types.numbers.between start must be less than or equal to end";
+            lib.types.withCheck lib.types.number (value: value >= start && value <= end)
+            // {
+              name = "NumberBetween";
+              description = "numbereger between ${description start end}";
+            };
       in
       {
         inherit between;
@@ -447,8 +454,7 @@ lib: {
     };
 
     attrs = {
-      ## A type that allows an attribute set containing any type of value. The merged
-      ## definitions must all be.
+      ## A type that allows an attribute set containing any type of value.
       ##
       ## @type Attrs
       any = lib.types.create {
@@ -480,10 +486,12 @@ lib: {
             let
               normalize =
                 definition:
-                builtins.mapAttrs (name: value: {
-                  __file__ = definition.__file__;
-                  value = value;
-                }) definition.value;
+                builtins.mapAttrs
+                  (name: value: {
+                    __file__ = definition.__file__;
+                    value = value;
+                  })
+                  definition.value;
               normalized = builtins.map normalize definitions;
               zipper =
                 name: definitions: (lib.options.merge.definitions (location ++ [ name ]) type definitions).optional;
@@ -520,17 +528,19 @@ lib: {
             let
               normalize =
                 definition:
-                builtins.mapAttrs (name: value: {
-                  __file__ = definition.__file__;
-                  value = value;
-                }) definition.value;
+                builtins.mapAttrs
+                  (name: value: {
+                    __file__ = definition.__file__;
+                    value = value;
+                  })
+                  definition.value;
               normalized = builtins.map normalize definitions;
               zipper =
                 name: definitions:
                 let
                   merged = lib.options.merge.definitions (location ++ [ name ]) type definitions;
                 in
-                merged.optional.value or type.fallback.value or merged.merged;
+                  merged.optional.value or type.fallback.value or merged.merged;
             in
             builtins.zipAttrsWith zipper normalized;
           getSubOptions = prefix: type.getSubOptions (prefix ++ [ "<name>" ]);
@@ -569,7 +579,7 @@ lib: {
       ##
       ## @type Attrs
       shell = lib.types.derivation // {
-        check = value: lib.packages.isDerivation && builtins.hasAttr "shellPath" value;
+        check = value: lib.packages.isDerivation value && builtins.hasAttr "shellPath" value;
       };
     };
 
@@ -606,25 +616,30 @@ lib: {
           merge =
             location: definitions:
             let
-              result = lib.lists.mapWithIndex1 (
-                i: definition:
-                lib.lists.mapWithIndex1 (
-                  j: value:
-                  let
-                    resolved =
-                      lib.options.merge.definitions (location ++ [ "[definition ${builtins.toString i}-entry ${j}]" ])
-                        type
-                        [
-                          {
-                            file = definition.file;
-                            value = value;
-                          }
-                        ];
-                  in
-                  resolved.optional
-                ) definition.value
-              ) definitions;
-              merged = builtins.concatLists result;
+              result = lib.lists.mapWithIndex1
+                (
+                  i: definition:
+                    lib.lists.mapWithIndex1
+                      (
+                        j: value:
+                          let
+                            resolved =
+                              lib.options.merge.definitions (location ++ [ "[definition ${builtins.toString i}-entry ${j}]" ])
+                                type
+                                [
+                                  {
+                                    file = definition.file;
+                                    value = value;
+                                  }
+                                ];
+                          in
+                          resolved.optional
+                      )
+                      definition.value
+                )
+                definitions;
+
+              merged = lib.lists.flatten result;
               filtered = builtins.filter (definition: definition ? value) merged;
               values = lib.options.getDefinitionValues filtered;
             in
@@ -777,11 +792,11 @@ lib: {
       ##
       ## @type { modules :: List Module, args? :: Attrs, description? :: String | Null, shorthand? :: Bool } -> Attrs
       of =
-        settings@{
-          modules,
-          args ? { },
-          description ? null,
-          shorthand ? true,
+        settings@{ modules
+        , args ? { }
+        , description ? null
+        , shorthand ? true
+        ,
         }:
         let
           getModules = builtins.map (
@@ -790,9 +805,12 @@ lib: {
               let
                 # TODO: Figure out if we can apply additional attributes to the generated module.
                 # Currently this causes issues to do with redefined options.
-                rest = builtins.removeAttrs (lib.attrs.filter (
-                  name: value: builtins.elem name lib.modules.VALID_KEYS
-                ) definition.value) [ "freeform" ];
+                rest = builtins.removeAttrs
+                  (lib.attrs.filter
+                    (
+                      name: value: builtins.elem name lib.modules.VALID_KEYS
+                    )
+                    definition.value) [ "freeform" ];
               in
               if definition.value ? config then
                 rest
@@ -922,10 +940,12 @@ lib: {
           merge = location: definitions: {
             includes =
               modules
-              ++ builtins.map (definition: {
-                __file__ = "${definition.__file__}; via ${lib.options.getIdentifier location}";
-                includes = [ definition.value ];
-              }) definitions;
+              ++ builtins.map
+                (definition: {
+                  __file__ = "${definition.__file__}; via ${lib.options.getIdentifier location}";
+                  includes = [ definition.value ];
+                })
+                definitions;
           };
           getSubOptions = submodule.getSubOptions;
           getSubModules = submodule.getSubModules;
@@ -961,10 +981,12 @@ lib: {
         location: definitions:
         let
           first = builtins.elemAt definitions 0;
-          modules = builtins.map (definition: {
-            __file__ = definition.__file__;
-            options = lib.options.create { type = definition.value; };
-          }) definitions;
+          modules = builtins.map
+            (definition: {
+              __file__ = definition.__file__;
+              options = lib.options.create { type = definition.value; };
+            })
+            definitions;
           merged = lib.modules.fixup location (lib.options.merge.declarations location modules);
         in
         if builtins.length definitions == 1 then first.value else merged.type;
@@ -1197,10 +1219,12 @@ lib: {
           merge =
             location: definitions:
             submodule.merge location (
-              builtins.map (definition: {
-                __file__ = definition.__file__;
-                value = normalize definition;
-              }) definitions
+              builtins.map
+                (definition: {
+                  __file__ = definition.__file__;
+                  value = normalize definition;
+                })
+                definitions
             );
         };
     };

tidepool/flake.lock

@@ -8,33 +8,35 @@
       },
       "locked": {
         "dir": "foundation",
-        "dirtyRev": "2be3111b2c0911f40b47fe0a1fb22b5f5188cf59-dirty",
-        "dirtyShortRev": "2be3111-dirty",
-        "lastModified": 1719251485,
-        "narHash": "sha256-9G1TPBdlQNXCZf6A66bCT9m2vhodkSF+rDtqOVuFteY=",
+        "lastModified": 1724190751,
+        "narHash": "sha256-e8sOmeXS9YWuQqjW6gvtS3PIueazkf4S1iiJ/94eXv4=",
+        "ref": "master",
+        "rev": "4b36a5a0133f5481840bdfaf693c971215a7ef1f",
+        "revCount": 84,
         "type": "git",
-        "url": "file:../?dir=foundation"
+        "url": "file:../"
       },
       "original": {
         "dir": "foundation",
         "type": "git",
-        "url": "file:../?dir=foundation"
+        "url": "file:../"
       }
     },
     "lib": {
       "locked": {
         "dir": "lib",
-        "dirtyRev": "2be3111b2c0911f40b47fe0a1fb22b5f5188cf59-dirty",
-        "dirtyShortRev": "2be3111-dirty",
-        "lastModified": 1719251485,
-        "narHash": "sha256-9G1TPBdlQNXCZf6A66bCT9m2vhodkSF+rDtqOVuFteY=",
+        "lastModified": 1724190751,
+        "narHash": "sha256-e8sOmeXS9YWuQqjW6gvtS3PIueazkf4S1iiJ/94eXv4=",
+        "ref": "master",
+        "rev": "4b36a5a0133f5481840bdfaf693c971215a7ef1f",
+        "revCount": 84,
         "type": "git",
-        "url": "file:../?dir=lib"
+        "url": "file:../"
       },
       "original": {
         "dir": "lib",
         "type": "git",
-        "url": "file:../?dir=lib"
+        "url": "file:../"
       }
     },
     "root": {

tidepool/src/builders/basic.nix

@@ -1,10 +1,8 @@
-{ lib, config }:
+{ config }:
 let
   cfg = config.builders.basic;
 
-  lib' = config.lib;
-
-  inherit (config) foundation;
+  inherit (config) lib foundation;
 in
 {
   config.builders = {
@@ -14,24 +12,45 @@ in
       build =
         package:
         let
-          phases = lib.dag.apply.defaults package.phases {
+          system = package.platform.build.double;
+
+          dependencies = lib.packages.dependencies.collect package;
+
+          context = lib.packages.context.create dependencies { };
+
+          hooks = lib.packages.hooks.create dependencies context;
+
+          phasesWithHooks =
+            let
+              all = lib.lists.flatten [
+                hooks.build.only
+                hooks.build.build
+                hooks.build.host
+                hooks.build.target
+                hooks.host.only
+                hooks.host.host
+                hooks.host.target
+                hooks.target.only
+                hooks.target.target
+              ];
+            in
+            builtins.foldl' (final: defaults: lib.dag.apply.defaults final defaults) package.phases all;
+
+          phases = lib.dag.apply.defaults phasesWithHooks {
             unpack = lib.dag.entry.before [ "patch" ] "";
 
-            patch = lib.dag.entry.between [ "configure" ] [ "unpack" ] "";
+            patch = lib.dag.entry.between [ "unpack" ] [ "configure" ] "";
 
-            configure = lib.dag.entry.between [ "build" ] [ "patch" ] "";
+            configure = lib.dag.entry.between [ "patch" ] [ "build" ] "";
 
-            build = lib.dag.entry.between [ "install" ] [ "configure" ] "";
+            build = lib.dag.entry.between [ "configure" ] [ "install" ] "";
 
             install = lib.dag.entry.after [ "build" ] "";
           };
-          sorted = lib.dag.sort.topographic phases;
 
-          script = lib.strings.concatMapSep "\n" (
-            entry: if builtins.isFunction entry.value then entry.value package else entry.value
-          ) sorted.result;
+          sorted = lib.dag.sort.topological phases;
 
-          system = package.platform.build.double;
+          script = lib.strings.concatMapSep "\n" (entry: entry.value) sorted.result;
 
           built = builtins.derivation (
             package.env
@@ -46,7 +65,15 @@ in
               PATH =
                 let
                   bins = lib.paths.bin (
-                    (lib'.packages.dependencies.getPackages package.deps.build.host)
+                    (lib.packages.dependencies.get dependencies.build.only)
+                    ++ (lib.packages.dependencies.get dependencies.build.build)
+                    ++ (lib.packages.dependencies.get dependencies.build.host)
+                    ++ (lib.packages.dependencies.get dependencies.build.target)
+                    ++ (lib.packages.dependencies.get dependencies.host.only)
+                    ++ (lib.packages.dependencies.get dependencies.host.host)
+                    ++ (lib.packages.dependencies.get dependencies.host.target)
+                    ++ (lib.packages.dependencies.get dependencies.target.only)
+                    ++ (lib.packages.dependencies.get dependencies.target.target)
                     ++ [
                       foundation.stage2-bash
                       foundation.stage2-coreutils
@@ -80,12 +107,14 @@ in
             }
           );
         in
+        # (builtins.trace "build: ${package.name} -> build=${package.platform.build.triple} host=${package.platform.host.triple} target=${package.platform.target.triple}")
         built
         // {
           inherit (package) meta;
           extras = {
-            inherit package;
-          };
+            inherit package context;
+            phases = builtins.listToAttrs sorted.result;
+          } // package.extras;
         };
     };
   };

tidepool/src/export.nix

@@ -14,28 +14,26 @@ in
 
       packages = {
         aux-a = config.packages.aux.a;
+        aux-b = config.packages.aux.b;
 
-        # foundation-gcc-x86_64 =
-        # (config.packages.foundation.gcc.versions."13.2.0".extend (args: {
-        #   config = {
-        #     platform = {
-        #       target = lib.modules.overrides.force "x86_64-linux";
-        #     };
-        #   };
-        # }))
-        # .config;
         foundation-gcc = config.packages.foundation.gcc;
+        foundation-glibc = config.packages.foundation.glibc;
         foundation-binutils = config.packages.foundation.binutils;
         foundation-linux-headers = config.packages.foundation.linux-headers;
-        # foundation-linux-headers = config.packages.foundation.linux-headers.versions.latest.extend {
-        #   platform.host = lib.modules.overrides.force "x86_64-linux";
-        # };
-        # example-x = config.packages.example.x;
-        cross-aux-a-x86_64-linux = config.packages.cross.x86_64-linux.aux.a;
-        cross-foundation-gcc-x86_64-linux = config.packages.cross.x86_64-linux.foundation.gcc;
+
+        cross-foundation-glibc-x86_64-linux = config.packages.cross.x86_64-linux.foundation.glibc;
+        cross-foundation-binutils-x86_64-linux = config.packages.cross.x86_64-linux.foundation.binutils;
+
+        cross-tool-foundation-gcc-newlib-x86_64-linux = config.packages.cross-tools.x86_64-linux.foundation.gcc-newlib;
+        cross-tool-foundation-gcc-x86_64-linux = config.packages.cross-tools.x86_64-linux.foundation.gcc-cross;
+        cross-foundation-gcc-x86_64-linux = config.packages.cross.x86_64-linux.foundation.gcc-bootstrap;
+
+        example-a = config.packages.foundation.gcc.versions.latest.extend {
+          platform = {
+            target = lib.modules.override 0 "x86_64-linux";
+          };
+        };
       };
     };
-
-    # exported.packages.i686-linux.cross-foundation-gcc-x86_64-linux = config.packages.cross.x86_64-linux.foundation.gcc.package;
   };
 }

tidepool/src/lib/packages.nix

@@ -6,18 +6,267 @@ in
   config = {
     lib.packages = {
       dependencies = {
-        getPackages =
+        get =
           dependencies:
           let
-            available = builtins.filter (dependency: !(builtins.isNull dependency)) (
-              builtins.attrValues dependencies
-            );
+            exists = value: !(builtins.isNull value);
+            available = builtins.filter exists dependencies;
           in
           builtins.map (dependency: dependency.package) available;
 
         build =
           build': host': target':
           builtins.mapAttrs (name: dep: lib'.packages.build dep build' host' target');
+
+        collect =
+          package:
+          let
+            isPropagated = name: package: package.propagate or false;
+            getPropagatedDependencies = target: builtins.attrValues (lib.attrs.filter isPropagated target);
+
+            process =
+              dependencies:
+              let
+                getDeps =
+                  name: dependency:
+                  let
+                    deps = {
+                      build = {
+                        only = getPropagatedDependencies dependency.deps.build.only ++ process dependency.deps.build.only;
+                        build =
+                          getPropagatedDependencies dependency.deps.build.build
+                          ++ process dependency.deps.build.build;
+                        host = getPropagatedDependencies dependency.deps.build.host ++ process dependency.deps.build.host;
+                        target =
+                          getPropagatedDependencies dependency.deps.build.target
+                          ++ process dependency.deps.build.target;
+                      };
+                      host = {
+                        only = getPropagatedDependencies dependency.deps.host.only ++ process dependency.deps.host.only;
+                        host = getPropagatedDependencies dependency.deps.host.host ++ process dependency.deps.host.host;
+                        target =
+                          getPropagatedDependencies dependency.deps.host.target
+                          ++ process dependency.deps.host.target;
+                      };
+                      target = {
+                        only = getPropagatedDependencies dependency.deps.target.only ++ process dependency.deps.target.only;
+                        target =
+                          getPropagatedDependencies dependency.deps.target.target
+                          ++ process dependency.deps.target.target;
+                      };
+                    };
+                  in
+                  lib.lists.flatten [
+                    deps.build.only
+                    deps.build.build
+                    deps.build.host
+                    deps.build.target
+                    deps.host.only
+                    deps.host.host
+                    deps.host.target
+                    deps.target.only
+                    deps.target.target
+                  ];
+
+                propagated = lib.attrs.mapToList getDeps dependencies;
+              in
+              lib.lists.flatten propagated;
+          in
+          {
+            build = {
+              only = builtins.attrValues package.deps.build.only ++ process package.deps.build.only;
+              build = builtins.attrValues package.deps.build.build ++ process package.deps.build.build;
+              host = builtins.attrValues package.deps.build.host ++ process package.deps.build.host;
+              target = builtins.attrValues package.deps.build.target ++ process package.deps.build.target;
+            };
+            host = {
+              only = builtins.attrValues package.deps.host.only ++ process package.deps.host.only;
+              host = builtins.attrValues package.deps.host.host ++ process package.deps.host.host;
+              target = builtins.attrValues package.deps.host.target ++ process package.deps.host.target;
+            };
+            target = {
+              only = builtins.attrValues package.deps.target.only ++ process package.deps.target.only;
+              target = builtins.attrValues package.deps.target.target ++ process package.deps.target.target;
+            };
+          };
+      };
+
+      context = {
+        create =
+          collected: ctx:
+          let
+            process =
+              path:
+              let
+                dependencies = lib.attrs.selectOrThrow path collected;
+                contexts = builtins.map (dependency: dependency.context or { }) dependencies;
+                result = lib.modules.run {
+                  prefix = [ "<package>" ];
+                  modules = builtins.map (context: { config = context; }) contexts ++ [
+                    {
+                      freeform = lib.types.any;
+
+                      options = config.packages.context.options // {
+                        target = lib.options.create {
+                          description = "The dependency target that is being generated.";
+                          type = lib.types.enum [
+                            "build.only"
+                            "build.build"
+                            "build.host"
+                            "build.target"
+                            "host.only"
+                            "host.host"
+                            "host.target"
+                            "target.only"
+                            "target.target"
+                          ];
+                          writable = false;
+                          default.value = builtins.concatStringsSep "." path;
+                        };
+
+                        deps = lib.options.create {
+                          description = "The collected dependencies.";
+                          writable = false;
+                          default.value = collected;
+                          type = lib.types.submodule {
+                            options = {
+                              build = {
+                                only = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                build = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                host = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                target = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                              };
+                              host = {
+                                only = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                host = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                target = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                              };
+                              target = {
+                                only = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                                target = lib.options.create { type = lib.types.list.of lib'.types.package; };
+                              };
+                            };
+                          };
+                        };
+                      };
+
+                      config = ctx;
+                    }
+                  ];
+                };
+              in
+              result.config;
+          in
+          {
+            build = {
+              only = process [
+                "build"
+                "only"
+              ];
+              build = process [
+                "build"
+                "build"
+              ];
+              host = process [
+                "build"
+                "host"
+              ];
+              target = process [
+                "build"
+                "target"
+              ];
+            };
+            host = {
+              only = process [
+                "host"
+                "only"
+              ];
+              host = process [
+                "host"
+                "host"
+              ];
+              target = process [
+                "host"
+                "target"
+              ];
+            };
+            target = {
+              only = process [
+                "target"
+                "only"
+              ];
+              target = process [
+                "target"
+                "target"
+              ];
+            };
+          };
+      };
+
+      hooks = {
+        create =
+          collected: ctx:
+          let
+            process =
+              path:
+              let
+                dependencies = lib.attrs.selectOrThrow path collected;
+                hooks = builtins.map
+                  (
+                    dependency:
+                    let
+                      getHooks = dependency.hooks or (lib.fp.const { });
+                    in
+                    getHooks ctx
+                  )
+                  dependencies;
+              in
+              hooks;
+          in
+          {
+            build = {
+              only = process [
+                "build"
+                "only"
+              ];
+              build = process [
+                "build"
+                "build"
+              ];
+              host = process [
+                "build"
+                "host"
+              ];
+              target = process [
+                "build"
+                "target"
+              ];
+            };
+            host = {
+              only = process [
+                "host"
+                "only"
+              ];
+              host = process [
+                "host"
+                "host"
+              ];
+              target = process [
+                "host"
+                "target"
+              ];
+            };
+            target = {
+              only = process [
+                "target"
+                "only"
+              ];
+              target = process [
+                "target"
+                "target"
+              ];
+            };
+          };
       };
 
       getLatest =

tidepool/src/lib/types.nix

@@ -214,7 +214,7 @@ in
             };
 
           submodule =
-            { config }:
+            { config, meta }:
             let
               build = config.platform.build;
               host = config.platform.host;
@@ -230,11 +230,68 @@ in
                   default.value = [ ];
                 };
 
+                # extend = lib.options.create {
+                #   description = "Extend the package definition.";
+                #   type = lib.types.function lib.types.raw;
+                #   internal = true;
+                #   writable = false;
+                #   default.value = module:
+                #     let
+                #       normalized =
+                #         if builtins.isList module then
+                #           module
+                #         else if builtins.isFunction module || module ? config then
+                #           [ module ]
+                #         else
+                #           [{
+                #             config = module;
+                #           }];
+                #       result = meta.extend {
+                #         modules =
+                #           normalized ++ [
+                #             {
+                #               config.__modules__ = lib.modules.overrides.force (config.__modules__ ++ normalized);
+                #             }
+                #           ];
+                #       };
+                #     in
+                #     result.config;
+                # };
+
+                extend = lib.options.create {
+                  description = "Extend the package definition.";
+                  type = lib.types.function lib.types.raw;
+                  internal = true;
+                  writable = false;
+                  default.value = module:
+                    let
+                      normalized =
+                        if builtins.isList module then
+                          module
+                        else if builtins.isFunction module || module ? config then
+                          [ module ]
+                        else
+                          [{
+                            config = module;
+                          }];
+
+											modules = config.__modules__ ++ normalized;
+
+                      result = lib.modules.run {
+                        modules = [
+													submodule
+													{ config.__modules__ = modules; }
+												] ++ modules;
+                      };
+                    in
+                    result.config;
+                };
+
                 meta = {
                   description = lib.options.create {
                     description = "The description for the package.";
-                    type = lib.types.nullish lib.types.string;
-                    default.value = null;
+                    type = lib.types.string;
+                    default.value = "";
                   };
 
                   homepage = lib.options.create {
@@ -280,6 +337,12 @@ in
                   };
                 };
 
+                extras = lib.options.create {
+                  description = "Extra information for the package.";
+                  type = lib.types.attrs.of lib.types.any;
+                  default.value = { };
+                };
+
                 platform = {
                   build = lib.options.create {
                     description = "The build platform for the package.";
@@ -327,12 +390,6 @@ in
                   type = lib'.types.builder;
                 };
 
-                phases = lib.options.create {
-                  description = "The phases for the package.";
-                  type = lib.types.dag.of lib.types.string;
-                  default.value = { };
-                };
-
                 env = lib.options.create {
                   description = "The environment for the package.";
                   type = lib.types.attrs.of lib.types.string;
@@ -345,6 +402,30 @@ in
                   default.value = config.builder.build config;
                 };
 
+                phases = lib.options.create {
+                  description = "The phases for the package.";
+                  type = lib.types.dag.of lib.types.string;
+                  default.value = { };
+                };
+
+                context = lib.options.create {
+                  description = "The context information that the package provides.";
+                  type = lib.types.attrs.of lib.types.raw;
+                  default.value = { };
+                };
+
+                hooks = lib.options.create {
+                  description = "The hooks that the package provides.";
+                  type = lib.types.function (lib.types.dag.of lib.types.string);
+                  default.value = ctx: { };
+                };
+
+                propagate = lib.options.create {
+                  description = "Whether the package should propagate its hooks and context.";
+                  type = lib.types.bool;
+                  default.value = false;
+                };
+
                 deps = lib.options.create {
                   description = "The dependencies for the package.";
                   type = deps build host target;

tidepool/src/packages/aux/a.nix

@@ -1,4 +1,4 @@
-{ lib', config }:
+{ config }:
 let
   inherit (config) builders packages;
 in

tidepool/src/packages/aux/b.nix

@@ -26,6 +26,22 @@ in
 
             builder = builders.basic;
 
+            deps = {
+              build = {
+                host = {
+                  c = packages.aux.c.versions.latest.extend {
+                    propagate = true;
+                  };
+                };
+              };
+            };
+
+            context = {
+              "foundation:cflags" = [ "-I $AUX_B/include" ];
+            };
+
+            hooks = ctx: { "aux:b:env" = lib.dag.entry.after [ "unpack" ] ''export AUX_B=${config.package}''; };
+
             phases = {
               install = ''
                 echo "b" > $out

tidepool/src/packages/aux/c.nix

@@ -0,0 +1,44 @@
+{ config }:
+let
+  inherit (config) lib builders packages;
+in
+{
+  config.packages.aux.c = {
+    versions = {
+      "latest" =
+        { config }:
+        {
+          options = {
+            custom = lib.options.create { type = lib.types.bool; };
+          };
+
+          config = {
+            meta = {
+              platforms = [ "i686-linux" ];
+            };
+
+            name = "${config.pname}-${config.version}";
+
+            custom = true;
+
+            pname = "c";
+            version = "1.0.0";
+
+            builder = builders.basic;
+
+            context = {
+              "foundation:cflags" = [ "-I $AUX_C/include" ];
+            };
+
+            hooks = ctx: { "aux:c:env" = lib.dag.entry.after [ "unpack" ] ''export AUX_C=${config.package}''; };
+
+            phases = {
+              install = ''
+                echo "c" > $out
+              '';
+            };
+          };
+        };
+    };
+  };
+}

tidepool/src/packages/default.nix

@@ -4,13 +4,14 @@ let
 
   doubles = lib.systems.doubles.all;
 
-  packages = builtins.removeAttrs config.packages [ "cross" ];
+  packages = builtins.removeAttrs config.packages [ "cross" "cross-tools" ];
 in
 {
   includes = [
     ./foundation
     ./aux/a.nix
     ./aux/b.nix
+    ./aux/c.nix
   ];
 
   options = {
@@ -19,14 +20,32 @@ in
       type = lib.types.submodule {
         freeform = lib.types.packages;
 
-        options.cross = lib.attrs.generate doubles (
-          system:
-          lib.options.create {
-            description = "The cross-compiled package set for the ${system} target.";
-            type = lib.types.packages;
-            default = { };
-          }
-        );
+        options = {
+          cross-tools = lib.attrs.generate doubles (
+            system:
+            lib.options.create {
+              description = "The cross-compilation tools for the ${system} target.";
+              type = lib.types.packages;
+              default.value = { };
+            }
+          );
+          cross = lib.attrs.generate doubles (
+            system:
+            lib.options.create {
+              description = "The cross-compiled package set for the ${system} target.";
+              type = lib.types.packages;
+              default.value = { };
+            }
+          );
+
+          # NOTE: We may offer a way to set default context values. For this reason we have
+          # nested `options` under `context` rather than using a plain option directly under `packages`.
+          context.options = lib.options.create {
+            description = "The available options for package contexts.";
+            default.value = { };
+            type = lib.types.attrs.of lib.types.option;
+          };
+        };
       };
     };
 
@@ -42,65 +61,67 @@ in
     };
   };
 
-  config.packages.cross = lib.attrs.generate doubles (
-    system:
-    builtins.mapAttrs (
-      namespace:
-      builtins.mapAttrs (
-        name: alias:
-        let
-          setHost =
-            package:
-            package
-            // {
-              __modules__ = package.__modules__ ++ [
-                {
-                  config.platform = {
-                    host = lib.modules.override 5 system;
-                    target = lib.modules.override 5 system;
+  config = {
+    packages.cross-tools = lib.attrs.generate doubles (
+      system:
+      builtins.mapAttrs
+        (
+          namespace:
+          builtins.mapAttrs (
+            name: alias:
+              let
+                setTarget =
+                  package:
+                  package
+                  // {
+                    __modules__ = package.__modules__ ++ [
+                      {
+                        config.platform = {
+                          target = lib.modules.override 5 system;
+                        };
+                      }
+                    ];
                   };
-                }
-              ];
-            };
-          # if package != {}
-          # then
-          #   (package.extend (
-          #     {config}: {
-          #       config = {
-          #         platform = {
-          #           host = lib.modules.overrides.force system;
-          #           target = lib.modules.overrides.default system;
-          #         };
 
-          #         deps = {
-          #           build = {
-          #             only = setHost package.deps.build.only;
-          #             build = setHost package.deps.build.build;
-          #             host = setHost package.deps.build.host;
-          #             target = setHost package.deps.build.target;
-          #           };
-          #           host = {
-          #             only = setHost package.deps.host.only;
-          #             host = setHost package.deps.host.host;
-          #             target = setHost package.deps.host.target;
-          #           };
-          #           target = {
-          #             only = setHost package.deps.target.only;
-          #             target = setHost package.deps.target.target;
-          #           };
-          #         };
-          #       };
-          #     }
-          #   ))
-          #   .config
-          # else package;
+                updated = alias // {
+                  versions = builtins.mapAttrs (version: package: setTarget package) alias.versions;
+                };
+              in
+              updated
+          )
+        )
+        packages
+    );
+    packages.cross = lib.attrs.generate doubles (
+      system:
+      builtins.mapAttrs
+        (
+          namespace:
+          builtins.mapAttrs (
+            name: alias:
+              let
+                setPlatform =
+                  package:
+                  package
+                  // {
+                    __modules__ = package.__modules__ ++ [
+                      {
+                        config.platform = {
+                          host = lib.modules.override 5 system;
+                          target = lib.modules.override 5 system;
+                        };
+                      }
+                    ];
+                  };
 
-          updated = alias // {
-            versions = builtins.mapAttrs (version: package: setHost package) alias.versions;
-          };
-        in
-        updated
-      )
-    ) packages
-  );
+                updated = alias // {
+                  versions = builtins.mapAttrs (version: package: setPlatform package) alias.versions;
+                };
+              in
+              updated
+          )
+        )
+        packages
+    );
+  };
 }

tidepool/src/packages/foundation/binutils/default.nix

@@ -1,8 +1,8 @@
-{
-  lib,
-  lib',
-  config,
-  options,
+{ lib
+, lib'
+, config
+, options
+,
 }:
 let
   inherit (config)
@@ -27,101 +27,149 @@ in
             };
           };
 
-          config = {
-            meta = {
-              platforms = [ "i686-linux" ];
-            };
+          config =
+            let
+              isBuildBootstrapped = config.platform.build.double == "i686-linux";
+              isHostBootstrapped = config.platform.host.double == "i686-linux";
 
-            pname = "binutils";
-            version = "2.41";
+              isBootstrapped = isBuildBootstrapped && isHostBootstrapped;
 
-            builder = builders.basic;
+              isCross =
+                config.platform.build.double != config.platform.host.double
+                && config.platform.host.double == config.platform.target.double;
+            in
+            {
+              meta = {
+                platforms = [
+                  "i686-linux"
+                  "x86_64-linux"
+                ];
+              };
 
-            deps = {
-              build = {
-                host = {
-                  inherit (packages.foundation) gcc;
+              pname = "binutils";
+              version = "2.41";
+
+              builder = builders.basic;
+
+              deps = {
+                build = {
+                  only = {
+                    gcc = lib.modules.when (!isBootstrapped) (
+                      if isCross then
+                        packages.foundation.gcc-cross.versions.latest.extend
+                          {
+                            platform = lib.modules.override 0 {
+                              inherit (config.platform) build target;
+                              host = config.platform.build;
+                            };
+                          }
+                      else
+                        packages.foundation.gcc.versions.latest
+                    );
+                    glibc = lib.modules.when (isCross) (
+                      packages.foundation.glibc.versions.latest.extend {
+                        platform = lib.modules.override 0 {
+                          inherit (config.platform) host target build;
+                        };
+                      }
+                    );
+                    binutils = lib.modules.when (isCross) (
+                      packages.foundation.binutils.versions.latest.extend {
+                        platform = lib.modules.override 0 {
+                          inherit (config.platform) target build;
+                          host = config.platform.build;
+                        };
+                      }
+                    );
+                  };
                 };
               };
-            };
 
-            env = {
-              PATH = lib.paths.bin [
-                # foundation.stage2-gcc
-                foundation.stage2-binutils
-                foundation.stage2-gnumake
-                foundation.stage2-gnupatch
-                foundation.stage2-gnused
-                foundation.stage2-gnugrep
-                foundation.stage2-gawk
-                foundation.stage2-diffutils
-                foundation.stage2-findutils
-                foundation.stage2-gnutar
-                foundation.stage1-xz
-              ];
-            };
+              env = {
+                PATH = lib.paths.bin (
+                  lib.lists.when (isBootstrapped) [ foundation.stage2-gcc ]
+                    ++ [
+                    foundation.stage2-gcc
+                    foundation.stage2-binutils
+                    foundation.stage2-gnumake
+                    foundation.stage2-gnupatch
+                    foundation.stage2-gnused
+                    foundation.stage2-gnugrep
+                    foundation.stage2-gawk
+                    foundation.stage2-diffutils
+                    foundation.stage2-findutils
+                    foundation.stage2-gnutar
+                    foundation.stage1-xz
+                  ]
+                );
+              } // (lib.attrs.when (isCross) {
+                LDFLAGS_FOR_TARGET = "-B${config.deps.build.only.glibc.package}/lib -L${config.deps.build.only.glibc.package}/lib -I${config.deps.build.only.glibc.package}/include";
+              });
 
-            phases =
-              let
-                patches = [
-                  # Make binutils output deterministic by default.
-                  ./patches/deterministic.patch
-                ];
+              phases =
+                let
+                  patches = [
+                    # Make binutils output deterministic by default.
+                    ./patches/deterministic.patch
+                  ];
 
-                configureFlags = [
-                  # "CC=musl-gcc"
-                  "LDFLAGS=--static"
-                  "--prefix=${builtins.placeholder "out"}"
-                  "--build=${config.platform.build.triple}"
-                  "--host=${config.platform.host.triple}"
-                  "--target=${config.platform.target.triple}"
+                  configureFlags =
+                    lib.lists.when (!isCross) [
+                      "LDFLAGS=--static"
+                    ]
+                    ++ [
+                      "--prefix=${builtins.placeholder "out"}"
+                      "--build=${config.platform.build.triple}"
+                      "--host=${config.platform.host.triple}"
+                      "--target=${config.platform.target.triple}"
 
-                  "--with-sysroot=/"
-                  "--enable-deterministic-archives"
-                  # depends on bison
-                  "--disable-gprofng"
+                      "--with-sysroot=/"
+                      "--enable-deterministic-archives"
+                      # depends on bison
+                      "--disable-gprofng"
 
-                  # Turn on --enable-new-dtags by default to make the linker set
-                  # RUNPATH instead of RPATH on binaries.  This is important because
-                  # RUNPATH can be overridden using LD_LIBRARY_PATH at runtime.
-                  "--enable-new-dtags"
+                      # Turn on --enable-new-dtags by default to make the linker set
+                      # RUNPATH instead of RPATH on binaries.  This is important because
+                      # RUNPATH can be overridden using LD_LIBRARY_PATH at runtime.
+                      "--enable-new-dtags"
 
-                  # By default binutils searches $libdir for libraries. This brings in
-                  # libbfd and libopcodes into a default visibility. Drop default lib
-                  # path to force users to declare their use of these libraries.
-                  "--with-lib-path=:"
+                      # By default binutils searches $libdir for libraries. This brings in
+                      # libbfd and libopcodes into a default visibility. Drop default lib
+                      # path to force users to declare their use of these libraries.
+                      "--with-lib-path=:"
 
-                  "--disable-multilib"
-                ];
-              in
-              {
-                unpack = ''
-                  tar xf ${config.src}
-                  cd binutils-${config.version}
-                '';
+                      "--disable-multilib"
 
-                patch = ''
-                  ${lib.strings.concatMapSep "\n" (file: "patch -Np1 -i ${file}") patches}
-                '';
+                    ];
+                in
+                {
+                  unpack = ''
+                    tar xf ${config.src}
+                    cd binutils-${config.version}
+                  '';
 
-                configure = ''
-                  bash ./configure ${builtins.concatStringsSep " " configureFlags}
-                '';
+                  patch = ''
+                    ${lib.strings.concatMapSep "\n" (file: "patch -Np1 -i ${file}") patches}
+                  '';
 
-                build = ''
-                  make -j $NIX_BUILD_CORES
-                '';
+                  configure = ''
+                    bash ./configure ${builtins.concatStringsSep " " configureFlags}
+                  '';
 
-                install = ''
-                  make -j $NIX_BUILD_CORES install-strip
-                '';
+                  build = ''
+                    make -j $NIX_BUILD_CORES
+                  '';
+
+                  install = ''
+                    make -j $NIX_BUILD_CORES install-strip
+                  '';
+                };
+
+              src = builtins.fetchurl {
+                url = "${mirrors.gnu}/binutils/binutils-${config.version}.tar.xz";
+                sha256 = "rppXieI0WeWWBuZxRyPy0//DHAMXQZHvDQFb3wYAdFA=";
               };
-
-            src = builtins.fetchurl {
-              url = "${mirrors.gnu}/binutils/binutils-${config.version}.tar.xz";
-              sha256 = "rppXieI0WeWWBuZxRyPy0//DHAMXQZHvDQFb3wYAdFA=";
             };
-          };
         };
     };
   };

tidepool/src/packages/foundation/gcc/bootstrap.nix

@@ -0,0 +1,84 @@
+{ config, options }:
+let
+  inherit (config)
+    lib
+    packages
+    ;
+in
+{
+  config.packages.foundation.gcc-bootstrap = {
+    versions = {
+      "latest" = config.packages.foundation.gcc.versions.latest.extend
+        (
+          { config }:
+          {
+            config = {
+              meta = {
+                platforms = lib.modules.override 0 [
+                  "i686-linux"
+                ];
+              };
+
+              deps = {
+                build = {
+                  build = {
+                    gcc = lib.modules.override 0 (
+                      packages.foundation.gcc-cross.versions.latest.extend {
+                        platform = lib.modules.override 0 {
+                          build = "i686-linux";
+                          target = config.platform.target;
+                          host = "i686-linux";
+                        };
+                      }
+                    );
+                    binutils = lib.modules.override 0 (
+                      packages.foundation.binutils.versions.latest.extend {
+                        platform = lib.modules.override 0 {
+                          build = "i686-linux";
+                          target = config.platform.target;
+                          host = config.platform.host;
+                        };
+                      }
+                    );
+                    glibc = lib.modules.override 0 (
+                      packages.foundation.glibc.versions.latest.extend {
+                        platform = lib.modules.override 0 {
+                          build = "i686-linux";
+                          target = config.platform.target;
+                          host = config.platform.host;
+                        };
+                      }
+                    );
+                  };
+                };
+              };
+
+              env = {
+                LIBRARY_PATH = lib.modules.override 0 "${config.deps.build.build.glibc.package}/lib";
+                LDFLAGS_FOR_TARGET =
+                  lib.modules.override 0
+                    "-L$(pwd)/${config.platform.target.triple}/libgcc -L${config.deps.build.build.glibc.package}/lib";
+              };
+
+              configureFlags = lib.modules.override 0 [
+                "--prefix=${builtins.placeholder "out"}"
+                # Pretend we're native even though we're not
+                "--build=${config.platform.target.triple}"
+                "--host=${config.platform.host.triple}"
+                "--target=${config.platform.target.triple}"
+                "--with-as=${config.deps.build.build.binutils.package}/bin/as"
+                "--with-ld=${config.deps.build.build.binutils.package}/bin/ld"
+                "--enable-languages=c,c++"
+                "--disable-bootstrap"
+                "--disable-libsanitizer"
+                "--disable-multilib"
+                "--with-native-system-header-dir=${config.deps.build.build.glibc.package}/include"
+                "--with-gxx-include-dir=${placeholder "out"}/include/c++/${config.version}/"
+                "--with-build-sysroot=/"
+              ];
+            };
+          }
+        );
+    };
+  };
+}

tidepool/src/packages/foundation/gcc/cross.nix

@@ -0,0 +1,104 @@
+{ config, options }:
+let
+  inherit (config)
+    lib
+    foundation
+    packages
+    ;
+in
+{
+  config.packages.foundation.gcc-cross = {
+    versions = {
+      "latest" = config.packages.foundation.gcc.versions.latest.extend
+        (
+          { config }:
+          {
+            config =
+              let
+                programPrefix = lib.strings.when
+                  (
+                    config.platform.build.triple != config.platform.target.triple
+                  ) "${config.platform.target.triple}-";
+              in
+              {
+                meta = {
+                  platforms = lib.modules.override 0 [
+                    "i686-linux"
+                  ];
+                };
+
+                deps = {
+                  build = {
+                    build = {
+                      binutils = (
+                        packages.foundation.binutils.versions.latest.extend {
+                          platform = lib.modules.override 0 config.platform;
+                        }
+                      );
+                      glibc = (
+                        packages.foundation.glibc.versions.latest.extend {
+                          platform = lib.modules.override 0 {
+                            inherit (config.platform) build target;
+                            host = config.platform.target;
+                          };
+                        }
+                      );
+                      linux-headers = (
+                        packages.foundation.linux-headers.versions.latest.extend {
+                          platform.target = lib.modules.override 0 config.platform.target;
+                        }
+                      );
+                    };
+                  };
+                };
+
+                env = {
+                  # LIBRARY_PATH = lib.modules.override 0 "${foundation.stage1-musl}/lib";
+                  CC = lib.modules.override 0 "gcc -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so -idirafter ${foundation.stage1-musl}/include";
+                  CXX = lib.modules.override 0 "g++ -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so -idirafter ${foundation.stage1-musl}/include";
+                  CFLAGS_FOR_TARGET =
+                    lib.modules.override 0
+                      "-Wl,-dynamic-linker -Wl,${config.deps.build.build.glibc.package}/lib/ld-linux-x86-64.so.2 -B${config.deps.build.build.glibc.package}/lib";
+                  LDFLAGS_FOR_TARGET =
+                    lib.modules.override 0
+                      "-L$(pwd)/${config.platform.target.triple}/libgcc -L${config.deps.build.build.glibc.package}/lib";
+                };
+
+                configureFlags = lib.modules.override 0 [
+                  "--prefix=${builtins.placeholder "out"}"
+                  "--build=${config.platform.build.triple}"
+                  "--host=${config.platform.host.triple}"
+                  "--target=${config.platform.target.triple}"
+                  "--with-as=${config.deps.build.build.binutils.package}/bin/${programPrefix}as"
+                  "--with-ld=${config.deps.build.build.binutils.package}/bin/${programPrefix}ld"
+                  "--enable-languages=c,c++"
+                  "--disable-libsanitizer"
+                  "--disable-lto"
+                  "--disable-multilib"
+                  "--with-headers=${config.deps.build.build.glibc.package}/include"
+                  "--with-build-sysroot=/"
+                  # "--with-sysroot=${config.deps.build.build.glibc.package}"
+                  "--with-native-system-header-dir=${config.deps.build.build.glibc.package}/include"
+                ];
+
+                phases.configure = lib.modules.override 0 ''
+                  # Configure
+
+                  mkdir build
+                  cd build
+                  echo PATH=$PATH
+
+                  # TODO(vlinkz) Hack to fix missing crti.o and crtn.o. Figure out how to properly find their paths.
+                  mkdir gcc
+                  ln -sv ${config.deps.build.build.glibc.package}/lib/{crti.o,crtn.o} gcc
+                  mkdir -p x86_64-unknown-linux-gnu/libstdc++-v3/src
+                  ln -sv ${config.deps.build.build.glibc.package}/lib/{crti.o,crtn.o} x86_64-unknown-linux-gnu/libstdc++-v3/src
+
+                  bash ../configure ${builtins.concatStringsSep " " config.configureFlags}
+                '';
+              };
+          }
+        );
+    };
+  };
+}

tidepool/src/packages/foundation/gcc/default.nix

@@ -11,6 +11,12 @@ let
     ;
 in
 {
+  includes = [
+    ./newlib.nix
+    ./cross.nix
+    ./bootstrap.nix
+  ];
+
   config.packages.foundation.gcc = {
     versions = {
       "latest" =
@@ -75,135 +81,239 @@ in
                 description = "Version of isl.";
               };
             };
-          };
 
-          config = {
-            meta = {
-              platforms = [ "i686-linux" ];
+            configureFlags = lib.options.create {
+              type = lib.types.list.of lib.types.string;
+              description = "Flags to pass to the configure script.";
             };
 
-            pname = "gcc";
-            version = "13.2.0";
-
-            builder = builders.basic;
-
-            env = {
-              PATH = lib.paths.bin [
-                foundation.stage2-gcc
-                foundation.stage2-binutils
-                foundation.stage2-gnumake
-                foundation.stage2-gnused
-                foundation.stage2-gnugrep
-                foundation.stage2-gawk
-                foundation.stage2-diffutils
-                foundation.stage2-findutils
-                foundation.stage2-gnutar
-                foundation.stage2-gzip
-                foundation.stage2-bzip2
-                foundation.stage1-xz
-              ];
-            };
-
-            phases =
-              let
-                host = lib.systems.withBuildInfo config.platform.host;
-
-                mbits = if host.system.cpu.family == "x86" then if host.is64bit then "-m64" else "-m32" else "";
-              in
-              {
-                unpack = ''
-                  # Unpack
-                  tar xf ${config.src}
-                  tar xf ${config.gmp.src}
-                  tar xf ${config.mpfr.src}
-                  tar xf ${config.mpc.src}
-                  tar xf ${config.isl.src}
-                  cd gcc-${config.version}
-
-                  ln -s ../gmp-${config.gmp.version} gmp
-                  ln -s ../mpfr-${config.mpfr.version} mpfr
-                  ln -s ../mpc-${config.mpc.version} mpc
-                  ln -s ../isl-${config.isl.version} isl
-                '';
-
-                patch = ''
-                  # Patch
-                  # force musl even if host triple is gnu
-                  sed -i 's|"os/gnu-linux"|"os/generic"|' libstdc++-v3/configure.host
-                '';
-
-                configure = ''
-                  # Configure
-                  export CC="gcc -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so"
-                  export CXX="g++ -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so"
-                  export CFLAGS_FOR_TARGET="-Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so"
-                  export LIBRARY_PATH="${foundation.stage1-musl}/lib"
-
-                  bash ./configure \
-                    --prefix=$out \
-                    --build=${config.platform.build.triple} \
-                    --host=${config.platform.host.triple} \
-                    --target=${config.platform.target.triple} \
-                    --with-native-system-header-dir=/include \
-                    --with-sysroot=${foundation.stage1-musl} \
-                    --enable-languages=c,c++ \
-                    --disable-bootstrap \
-                    --disable-libsanitizer \
-                    --disable-lto \
-                    --disable-multilib \
-                    --disable-plugin \
-                    CFLAGS=-static \
-                    CXXFLAGS=-static
-                '';
-
-                build = ''
-                  # Build
-                  make -j $NIX_BUILD_CORES
-                '';
-
-                install = ''
-                  # Install
-                  make -j $NIX_BUILD_CORES install-strip
-                '';
-              };
-
-            src = builtins.fetchurl {
-              url = "${mirrors.gnu}/gcc/gcc-${config.version}/gcc-${config.version}.tar.xz";
-              sha256 = "4nXnZEKmBnNBon8Exca4PYYTFEAEwEE1KIY9xrXHQ9o=";
-            };
-
-            gmp = {
-              version = "6.3.0";
-              src = builtins.fetchurl {
-                url = "${mirrors.gnu}/gmp/gmp-${config.gmp.version}.tar.xz";
-                sha256 = "o8K4AgG4nmhhb0rTC8Zq7kknw85Q4zkpyoGdXENTiJg=";
-              };
-            };
-
-            mpfr = {
-              version = "4.2.1";
-              src = builtins.fetchurl {
-                url = "${mirrors.gnu}/mpfr/mpfr-${config.mpfr.version}.tar.xz";
-                sha256 = "J3gHNTpnJpeJlpRa8T5Sgp46vXqaW3+yeTiU4Y8fy7I=";
-              };
-            };
-
-            mpc = {
-              version = "1.3.1";
-              src = builtins.fetchurl {
-                url = "${mirrors.gnu}/mpc/mpc-${config.mpc.version}.tar.gz";
-                sha256 = "q2QkkvXPiCt0qgy3MM1BCoHtzb7IlRg86TDnBsHHWbg=";
-              };
-            };
-
-            isl = {
-              version = "0.24";
-              src = builtins.fetchurl {
-                url = "https://gcc.gnu.org/pub/gcc/infrastructure/isl-${config.isl.version}.tar.bz2";
-                sha256 = "/PeN2WVsEOuM+fvV9ZoLawE4YgX+GTSzsoegoYmBRcA=";
-              };
+            exports = lib.options.create {
+              type = lib.types.attrs.of lib.types.string;
+              description = "List of exports to add to the environment.";
             };
           };
+
+          config =
+            let
+              isBuildBootstrapped = config.platform.build.double == "i686-linux";
+              isHostBootstrapped = config.platform.host.double == "i686-linux";
+
+              isBootstrapped = isBuildBootstrapped && isHostBootstrapped;
+
+              crossTool =
+                (config.platform.target.triple != config.platform.host.triple)
+                && (config.platform.host.triple == config.platform.build.triple);
+              cross =
+                (config.platform.target.triple != config.platform.host.triple)
+                && (config.platform.host.triple == config.platform.target.triple);
+
+              programPrefix = lib.strings.when
+                (
+                  config.platform.build.triple != config.platform.target.triple
+                ) "${config.platform.target.triple}-";
+
+              libc = if isBootstrapped then foundation.stage1-musl else config.deps.build.build.glibc.package;
+              libcLd =
+                if isBootstrapped then
+                  "${foundation.stage1-musl}/lib/libc.so"
+                else
+                  "${config.deps.build.build.glibc.package}/lib/ld-linux-x86-64.so.2";
+
+              host = lib.systems.withBuildInfo config.platform.host;
+              target = lib.systems.withBuildInfo config.platform.target;
+            in
+            {
+              meta = {
+                platforms = [
+                  "i686-linux"
+                ];
+              };
+
+              pname = "gcc-${config.platform.build.double}--${config.platform.host.double}--${config.platform.target.double}";
+              version = "13.2.0";
+
+              builder = builders.basic;
+
+              deps = {
+                build = {
+                  build = lib.modules.when (!isBootstrapped) {
+                    gcc = packages.foundation.gcc-cross.versions.latest;
+                    glibc = packages.foundation.glibc.versions.latest;
+                    linux-headers = packages.foundation.linux-headers.versions.latest;
+                    binutils = packages.foundation.binutils.versions.latest;
+                  };
+                };
+              };
+
+              env =
+                {
+                  PATH = lib.modules.when (isBuildBootstrapped) (
+                    lib.paths.bin ([
+                      foundation.stage2-gnumake
+                      foundation.stage2-gnused
+                      foundation.stage2-gnugrep
+                      foundation.stage2-gnupatch
+                      foundation.stage2-gawk
+                      foundation.stage2-diffutils
+                      foundation.stage2-findutils
+                      foundation.stage2-gnutar
+                      foundation.stage2-gzip
+                      foundation.stage2-bzip2
+                      foundation.stage1-xz
+                    ] ++ (lib.lists.when (isBootstrapped) [
+                      foundation.stage2-gcc
+                      foundation.stage2-binutils
+                    ]))
+                  );
+                  CFLAGS_FOR_TARGET = "-Wl,-dynamic-linker -Wl,${libcLd}";
+                }
+                // lib.attrs.when (isBootstrapped) {
+                  CC = "gcc -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so";
+                  CXX = "g++ -Wl,-dynamic-linker -Wl,${foundation.stage1-musl}/lib/libc.so";
+                }
+                // lib.attrs.when (!cross && !crossTool) {
+                  LIBRARY_PATH = "${libc}/lib";
+                };
+
+              hooks =
+                let
+                  flags =
+                    if (isBootstrapped && !(cross || crossTool)) then
+                      [
+                        "-Wl,-dynamic-linker"
+                        "-Wl,${foundation.stage1-musl}/lib/libc.so"
+                      ]
+                    else
+                      [
+                        "-Wl,-dynamic-linker"
+                        "-Wl,${config.deps.build.build.glibc.package}/lib/ld-linux${lib.strings.when (target.isx86 && target.is64bit) "-x86-64"}.so.2"
+                        "-B${config.deps.build.build.glibc.package}/lib"
+                        # "-idirafter ${config.deps.build.build.glibc.package}/include"
+                      ];
+                in
+                ctx: {
+                  "aux:gcc:env" = lib.dag.entry.between [ "unpack" ] [ "configure" ] ''
+                    export CC='${config.package}/bin/${programPrefix}gcc  ${builtins.concatStringsSep " " flags}'
+                    export CXX='${config.package}/bin/${programPrefix}g++  ${builtins.concatStringsSep " " flags}'
+                    export CC_FOR_TARGET=$CC
+                    export CXX_FOR_TARGET=$CXX
+                    export CC_FOR_BUILD=$CC
+                    export CXX_FOR_BUILD=$CXX
+                    alias gcc='$CC'
+                    alias g++='$CXX'
+                  '';
+                };
+
+              configureFlags =
+                [
+                  "--prefix=${builtins.placeholder "out"}"
+                  "--build=${config.platform.build.triple}"
+                  "--host=${config.platform.host.triple}"
+                  "--target=${config.platform.target.triple}"
+                  "--enable-languages=c,c++"
+                  "--disable-bootstrap"
+                  "--disable-libsanitizer"
+                  "--disable-multilib"
+                  "--with-build-sysroot=/"
+                  "--with-native-system-header-dir=${libc}/include"
+                ]
+                ++ lib.lists.when (isBootstrapped) [
+                  "--disable-lto"
+                ];
+
+              phases =
+                let
+                  patches = [
+                    # Make binutils output deterministic by default.
+                    ./patches/libstdc++-target.patch
+                  ];
+                in
+                {
+                  unpack = ''
+                    # Unpack
+                    tar xf ${config.src}
+                    tar xf ${config.gmp.src}
+                    tar xf ${config.mpfr.src}
+                    tar xf ${config.mpc.src}
+                    tar xf ${config.isl.src}
+                    cd gcc-${config.version}
+
+                    ln -s ../gmp-${config.gmp.version} gmp
+                    ln -s ../mpfr-${config.mpfr.version} mpfr
+                    ln -s ../mpc-${config.mpc.version} mpc
+                    ln -s ../isl-${config.isl.version} isl
+                  '';
+
+                  patch = ''
+                    ${lib.strings.concatMapSep "\n" (file: "patch -Np1 -i ${file}") patches}
+                    ${lib.strings.when (isBootstrapped && !(crossTool || cross))''
+                      # force musl even if host triple is gnu
+                      sed -i 's|"os/gnu-linux"|"os/generic"|' libstdc++-v3/configure.host
+                    ''}
+                  '';
+
+                  configure = ''
+                    # Configure
+                    mkdir build
+                    cd build
+
+                    bash ../configure ${builtins.concatStringsSep " " config.configureFlags}
+                  '';
+
+                  build = ''
+                    # Build
+                    make -j $NIX_BUILD_CORES
+                  '';
+
+                  install = ''
+                    # Install
+                    ${
+                      lib.strings.when (host.is64bit) ''
+                        mkdir -p $out/lib
+                        ln -s lib $out/lib64
+                      ''
+                    }
+                    make -j $NIX_BUILD_CORES install
+                  '';
+                };
+
+              src = builtins.fetchurl {
+                url = "${mirrors.gnu}/gcc/gcc-${config.version}/gcc-${config.version}.tar.xz";
+                sha256 = "4nXnZEKmBnNBon8Exca4PYYTFEAEwEE1KIY9xrXHQ9o=";
+              };
+
+              gmp = {
+                version = "6.3.0";
+                src = builtins.fetchurl {
+                  url = "${mirrors.gnu}/gmp/gmp-${config.gmp.version}.tar.xz";
+                  sha256 = "o8K4AgG4nmhhb0rTC8Zq7kknw85Q4zkpyoGdXENTiJg=";
+                };
+              };
+
+              mpfr = {
+                version = "4.2.1";
+                src = builtins.fetchurl {
+                  url = "${mirrors.gnu}/mpfr/mpfr-${config.mpfr.version}.tar.xz";
+                  sha256 = "J3gHNTpnJpeJlpRa8T5Sgp46vXqaW3+yeTiU4Y8fy7I=";
+                };
+              };
+
+              mpc = {
+                version = "1.3.1";
+                src = builtins.fetchurl {
+                  url = "${mirrors.gnu}/mpc/mpc-${config.mpc.version}.tar.gz";
+                  sha256 = "q2QkkvXPiCt0qgy3MM1BCoHtzb7IlRg86TDnBsHHWbg=";
+                };
+              };
+
+              isl = {
+                version = "0.24";
+                src = builtins.fetchurl {
+                  url = "https://gcc.gnu.org/pub/gcc/infrastructure/isl-${config.isl.version}.tar.bz2";
+                  sha256 = "/PeN2WVsEOuM+fvV9ZoLawE4YgX+GTSzsoegoYmBRcA=";
+                };
+              };
+            };
         };
     };
   };

tidepool/src/packages/foundation/gcc/newlib.nix

@@ -0,0 +1,71 @@
+{ config, options }:
+let
+  inherit (config)
+    lib
+    packages
+    ;
+in
+{
+  config.packages.foundation.gcc-newlib = {
+    versions = {
+      "latest" = config.packages.foundation.gcc.versions.latest.extend (
+        { config }:
+        {
+          config =
+            let
+              programPrefix = lib.strings.when
+                (
+                  config.platform.build.triple != config.platform.target.triple
+                ) "${config.platform.target.triple}-";
+            in
+            {
+              meta = {
+                platforms = lib.modules.override 0 [
+                  "i686-linux"
+                ];
+              };
+
+              deps = {
+                build = {
+                  build = {
+                    binutils = (
+                      packages.foundation.binutils.versions.latest.extend {
+                        platform = lib.modules.override 0 config.platform;
+                      }
+                    );
+                  };
+                };
+              };
+
+              configureFlags = lib.modules.override 0 [
+                "--prefix=${builtins.placeholder "out"}"
+                "--build=${config.platform.build.triple}"
+                "--host=${config.platform.host.triple}"
+                "--target=${config.platform.target.triple}"
+                "--with-as=${config.deps.build.build.binutils.package}/bin/${programPrefix}as"
+                "--with-ld=${config.deps.build.build.binutils.package}/bin/${programPrefix}ld"
+                "--enable-languages=c,c++"
+                "--disable-bootstrap"
+                "--disable-libsanitizer"
+                "--disable-lto"
+                "--disable-multilib"
+                "--disable-plugin"
+                "--disable-libssp"
+                "--disable-libvtv"
+                "--disable-libstdcxx"
+                "--disable-libquadmath"
+                "--disable-threads"
+                "--disable-decimal-float"
+                "--disable-shared"
+                "--disable-libmudflap"
+                "--disable-libgomp"
+                "--disable-libatomic"
+                "--without-headers"
+                "--with-newlib"
+              ];
+            };
+        }
+      );
+    };
+  };
+}

tidepool/src/packages/foundation/gcc/patches/libstdc++-target.patch

@@ -0,0 +1,33 @@
+# From https://github.com/NixOS/nixpkgs/blob/nixos-24.05/pkgs/development/compilers/gcc/patches/libstdc%2B%2B-target.patch
+Patch to make the target libraries 'configure' scripts find the proper CPP.
+I noticed that building the mingw32 cross compiler.
+Looking at the build script for mingw in archlinux, I think that only nixos
+needs this patch. I don't know why.
+diff --git a/Makefile.in b/Makefile.in
+index 93f66b6..d691917 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -266,6 +266,7 @@ BASE_TARGET_EXPORTS = \
+ 	AR="$(AR_FOR_TARGET)"; export AR; \
+ 	AS="$(COMPILER_AS_FOR_TARGET)"; export AS; \
+ 	CC="$(CC_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CC; \
++	CPP="$(CC_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CC; \
+ 	CFLAGS="$(CFLAGS_FOR_TARGET)"; export CFLAGS; \
+ 	CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
+ 	CPPFLAGS="$(CPPFLAGS_FOR_TARGET)"; export CPPFLAGS; \
+@@ -291,11 +292,13 @@ BASE_TARGET_EXPORTS = \
+ RAW_CXX_TARGET_EXPORTS = \
+ 	$(BASE_TARGET_EXPORTS) \
+ 	CXX_FOR_TARGET="$(RAW_CXX_FOR_TARGET)"; export CXX_FOR_TARGET; \
+-	CXX="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX;
++	CXX="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX; \
++	CXXCPP="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CXX;
+ 
+ NORMAL_TARGET_EXPORTS = \
+ 	$(BASE_TARGET_EXPORTS) \
+-	CXX="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX;
++	CXX="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX; \
++	CXXCPP="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CXX;
+ 
+ # Where to find GMP
+ HOST_GMPLIBS = @gmplibs@

tidepool/src/packages/foundation/glibc/default.nix

@@ -3,6 +3,7 @@
   lib',
   config,
   options,
+  packages,
 }:
 let
   inherit (config)
@@ -10,6 +11,7 @@ let
     builders
     # These are the upstream foundational packages exported from the Aux Foundation project.
 
+    packages
     foundation
     ;
 in
@@ -26,87 +28,124 @@ in
             };
           };
 
-          config = {
-            meta = {
-              platforms = [ "i686-linux" ];
-            };
+          config =
+            let
+              isCross =
+                (config.platform.build.triple != config.platform.host.triple)
+                && (config.platform.host.triple == config.platform.target.triple);
 
-            pname = "gcc";
-            version = "2.38";
+              binutils =
+                if isCross then
+                  "${
+                    (packages.foundation.binutils.versions.latest.extend {
+                      platform = lib.modules.override 0 {
+                        inherit (config.platform) build target;
+                        host = config.platform.build;
+                      };
+                    }).package
+                  }/${config.platform.target.triple}"
+                else
+                  foundation.stage2-binutils;
+            in
+            {
 
-            src = builtins.fetchurl {
-              url = "${mirrors.gnu}/libc/glibc-${config.version}.tar.xz";
-              sha256 = "+4KZiZiyspllRnvBtp0VLpwwfSzzAcnq+0VVt3DvP9I=";
-            };
-
-            builder = builders.basic;
-
-            env = {
-              PATH =
-                let
-                  gcc =
-                    if
-                      config.platform.build.triple == config.platform.host.triple
-                    # If we're on the same system then we can use the existing GCC instance.
-                    then
-                      foundation.stage2-gcc
-                    # Otherwise we are going to need a cross-compiler.
-                    else
-                      (meta.extend (args: {
-                        config = {
-                          platform = {
-                            build = config.platform.build.triple;
-                            host = config.platform.build.triple;
-                            target = lib.modules.override.force config.platform.host.triple;
-                          };
-                        };
-                      })).config.package;
-                in
-                lib.paths.bin [
-                  foundation.stage2-gcc
-                  foundation.stage2-binutils
-                  foundation.stage2-gnumake
-                  foundation.stage2-gnused
-                  foundation.stage2-gnugrep
-                  foundation.stage2-gawk
-                  foundation.stage2-diffutils
-                  foundation.stage2-findutils
-                  foundation.stage2-gnutar
-                  foundation.stage2-gzip
-                  foundation.stage2-bzip2
-                  foundation.stage1-xz
+              meta = {
+                platforms = [
+                  "i686-linux"
+                  "x86_64-linux"
                 ];
+              };
+
+              pname = "glibc";
+              version = "2.38";
+
+              src = builtins.fetchurl {
+                url = "${mirrors.gnu}/libc/glibc-${config.version}.tar.xz";
+                sha256 = "+4KZiZiyspllRnvBtp0VLpwwfSzzAcnq+0VVt3DvP9I=";
+              };
+
+              builder = builders.basic;
+
+              deps = {
+                build = {
+                  host = {
+                    linux-headers = (
+                      packages.foundation.linux-headers.versions.latest.extend {
+                        platform.target = lib.modules.override 0 config.platform.target;
+                      }
+                    );
+                  };
+                };
+              };
+
+              env = {
+                PATH =
+                  let
+                    gcc =
+                      if
+                        isCross
+                      # Otherwise we are going to need a cross-compiler.
+                      then
+                        (packages.foundation.gcc-newlib.versions.latest.extend {
+                          platform = lib.modules.override 0 {
+                            inherit (config.platform) build target;
+                            host = config.platform.build;
+                          };
+                        }).package
+                      # If we're on the same system then we can use the existing GCC instance.
+                      else
+                        foundation.stage2-gcc;
+                  in
+                  lib.paths.bin [
+                    gcc
+                    binutils
+                    foundation.stage2-gnumake
+                    foundation.stage2-gnused
+                    foundation.stage2-gnugrep
+                    foundation.stage2-gawk
+                    foundation.stage2-diffutils
+                    foundation.stage2-findutils
+                    foundation.stage2-gnutar
+                    foundation.stage2-gzip
+                    foundation.stage2-bzip2
+                    foundation.stage1-python
+                    foundation.stage1-bison
+                    foundation.stage1-xz
+                  ];
+              };
+
+              phases =
+
+                {
+                  unpack = ''
+                    tar xf ${config.src}
+                    cd glibc-${config.version}
+                  '';
+
+                  configure = ''
+                    mkdir build
+                    cd build
+
+                    bash ../configure \
+                      --prefix=$out \
+                      --build=${config.platform.build.triple} \
+                      --host=${config.platform.host.triple} \
+                      --with-headers=${config.deps.build.host.linux-headers.package}/include \
+                      --with-binutils=${binutils}/bin
+                  '';
+
+                  build = ''
+                    # Build
+                    make -j $NIX_BUILD_CORES
+                  '';
+
+                  install = ''
+                    # Install
+                    make -j $NIX_BUILD_CORES install
+                    ln -sv $(ls -d ${config.deps.build.host.linux-headers.package}/include/* | grep -v scsi\$) $out/include/
+                  '';
+                };
             };
-
-            phases = {
-              unpack = lib.dag.entry.before [ "patch" ] ''
-                tar xf ${config.src}
-                cd glibc-${config.version}
-              '';
-
-              configure = lib.dag.entry.between [ "build" ] [ "patch" ] ''
-                mkdir build
-                cd build
-                # libstdc++.so is built against musl and fails to link
-                export CXX=false
-                bash ../configure \
-                  --prefix=$out \
-                  --build=${config.platform.build.triple} \
-                  --host=${config.platform.host.triple} \
-                  --with-headers=${foundation.stage1-linux-headers}/include
-              '';
-
-              build = lib.dag.entry.between [ "install" ] [ "configure" ] ''
-                # Build
-                make -j $NIX_BUILD_CORES
-              '';
-
-              install = lib.dag.entry.after [ "build" ] ''
-                # Install
-                make -j $NIX_BUILD_CORES install-strip
-              '';
-            };
-          };
         };
     };
   };

tidepool/src/packages/foundation/linux-headers/default.nix

@@ -1,8 +1,8 @@
-{
-  lib,
-  lib',
-  config,
-  options,
+{ lib
+, lib'
+, config
+, options
+,
 }:
 let
   inherit (config)
@@ -28,7 +28,7 @@ in
 
           config = {
             meta = {
-              platforms = [ "i686-linux" ];
+              platforms = [ "x86_64-linux" "i686-linux" ];
             };
 
             pname = "linux-headers";
@@ -60,7 +60,7 @@ in
               '';
 
               build = ''
-                make -j $NIX_BUILD_CORES CC=musl-gcc HOSTCC=musl-gcc ARCH=${config.platform.host.linux.arch} headers
+                make -j $NIX_BUILD_CORES CC=musl-gcc HOSTCC=musl-gcc ARCH=${config.platform.target.linux.arch} headers
               '';
 
               install = ''