diff --git a/src/sw/builder/file_storage.cpp b/src/sw/builder/file_storage.cpp
index b4b18be19..030d873cf 100644
--- a/src/sw/builder/file_storage.cpp
+++ b/src/sw/builder/file_storage.cpp
@@ -46,7 +46,7 @@ FileStorage::FileStorage(const SwContext &swctx, const String &config)
 {
     //if (config.empty())
         //throw SW_RUNTIME_ERROR("Empty config");
-    //load();
+    load();
 }
 
 FileStorage::file_holder *FileStorage::getFileLog()
diff --git a/src/sw/driver/compiler.cpp b/src/sw/driver/compiler.cpp
index 4eb619387..04e36e4cb 100644
--- a/src/sw/driver/compiler.cpp
+++ b/src/sw/driver/compiler.cpp
@@ -1139,7 +1139,7 @@ void VisualStudioCompiler::prepareCommand1(const TargetBase &t)
     //cmd->out.capture = true;
 
     getCommandLineOptions<VisualStudioCompilerOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
 
     if (PreprocessToFile)
     {
@@ -1189,7 +1189,7 @@ void VisualStudioASMCompiler::prepareCommand1(const TargetBase &t)
     //cmd->base = clone();
 
     // defs and idirs for asm must go before file
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
     getCommandLineOptions<VisualStudioAssemblerOptions>(cmd.get(), *this);
 }
 
@@ -1236,7 +1236,7 @@ void ClangCompiler::prepareCommand1(const TargetBase &t)
     CPPStandard.skip = true;
 
     getCommandLineOptions<ClangOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*this->cmd); });
+    addEverything(*this->cmd);
     getCommandLineOptions<ClangOptions>(cmd.get(), *this, "", true);
 }
 
@@ -1297,7 +1297,7 @@ void ClangClCompiler::prepareCommand1(const TargetBase &t)
 
     getCommandLineOptions<VisualStudioCompilerOptions>(cmd.get(), *this);
     getCommandLineOptions<ClangClOptions>(cmd.get(), *this/*, "-Xclang"*/);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
 }
 
 void ClangClCompiler::setOutputFile(const path &output_file)
@@ -1341,7 +1341,7 @@ void GNUASMCompiler::prepareCommand1(const TargetBase &t)
     getCommandLineOptions<GNUAssemblerOptions>(cmd.get(), *this);
 
     if (!InputFile && !assembly)
-        iterate([this](auto & v, auto & gs) { v.addEverything(*cmd); });
+        addEverything(*cmd);
 }
 
 SW_DEFINE_PROGRAM_CLONE(GNUASMCompiler)
@@ -1394,7 +1394,7 @@ void GNUCompiler::prepareCommand1(const TargetBase &t)
     CPPStandard.skip = true;
 
     getCommandLineOptions<GNUOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*this->cmd); });
+    addEverything(*this->cmd);
     getCommandLineOptions<GNUOptions>(cmd.get(), *this, "", true);
 }
 
@@ -1419,36 +1419,34 @@ void GNUCompiler::setSourceFile(const path &input_file, path &output_file)
 FilesOrdered NativeLinker::gatherLinkDirectories() const
 {
     FilesOrdered dirs;
-    iterate([&dirs](auto &v, auto &gs)
+
+    auto get_ldir = [&dirs](const auto &a)
     {
-        auto get_ldir = [&dirs](const auto &a)
-        {
-            for (auto &d : a)
-                dirs.push_back(d);
-        };
+        for (auto &d : a)
+            dirs.push_back(d);
+    };
+
+    get_ldir(NativeLinkerOptions::gatherLinkDirectories());
+    get_ldir(NativeLinkerOptions::System.gatherLinkDirectories());
 
-        get_ldir(v.gatherLinkDirectories());
-        get_ldir(v.System.gatherLinkDirectories());
-    });
     return dirs;
 }
 
 FilesOrdered NativeLinker::gatherLinkLibraries(bool system) const
 {
     FilesOrdered dirs;
-    iterate([&dirs, &system](auto &v, auto &gs)
+
+    auto get_ldir = [&dirs](const auto &a)
     {
-        auto get_ldir = [&dirs](const auto &a)
-        {
-            for (auto &d : a)
-                dirs.push_back(d);
-        };
+        for (auto &d : a)
+            dirs.push_back(d);
+    };
+
+    if (system)
+        get_ldir(NativeLinkerOptions::System.gatherLinkLibraries());
+    else
+        get_ldir(NativeLinkerOptions::gatherLinkLibraries());
 
-        if (system)
-            get_ldir(v.System.gatherLinkLibraries());
-        else
-            get_ldir(v.gatherLinkLibraries());
-    });
     return dirs;
 }
 
@@ -1511,7 +1509,7 @@ void VisualStudioLibraryTool::prepareCommand1(const TargetBase &t)
     ((VisualStudioLibraryTool*)this)->VisualStudioLibraryToolOptions::LinkDirectories() = gatherLinkDirectories();
 
     getCommandLineOptions<VisualStudioLibraryToolOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
     getAdditionalOptions(cmd.get());
 }
 
@@ -1559,7 +1557,7 @@ void VisualStudioLinker::prepareCommand1(const TargetBase &t)
     ((VisualStudioLibraryTool*)this)->VisualStudioLibraryToolOptions::LinkDirectories() = gatherLinkDirectories();
 
     getCommandLineOptions<VisualStudioLibraryToolOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
     getAdditionalOptions(cmd.get());
 }
 
@@ -1722,7 +1720,7 @@ void GNULinker::prepareCommand1(const TargetBase &t)
     //((GNULibraryTool*)this)->GNULibraryToolOptions::LinkDirectories() = gatherLinkDirectories();
 
     getCommandLineOptions<GNULinkerOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
     //getAdditionalOptions(cmd.get());
 }
 
@@ -1796,7 +1794,7 @@ void GNULibrarian::prepareCommand1(const TargetBase &t)
     //((GNULibraryTool*)this)->GNULibraryToolOptions::LinkDirectories() = gatherLinkDirectories();
 
     getCommandLineOptions<GNULibrarianOptions>(cmd.get(), *this);
-    iterate([this](auto &v, auto &gs) { v.addEverything(*cmd); });
+    addEverything(*cmd);
     //getAdditionalOptions(cmd.get());
 }
 
diff --git a/src/sw/driver/compiler.h b/src/sw/driver/compiler.h
index b18f8c72a..95e05be6b 100644
--- a/src/sw/driver/compiler.h
+++ b/src/sw/driver/compiler.h
@@ -117,8 +117,10 @@ struct SW_DRIVER_CPP_API NativeToolchain
     };
 
     struct SDK SDK;
+    // also OS SDK (win sdk, macos sdk, linux headers etc.)
+    //std::optional<UnresolvedPackage> os sdk
     std::optional<UnresolvedPackage> libc;
-    //std::optional<UnresolvedPackage> libcpp; // ?
+    //std::optional<UnresolvedPackage> libcpp;
 
     std::shared_ptr<NativeLinker> Librarian;
     std::shared_ptr<NativeLinker> Linker;
diff --git a/src/sw/driver/options.h b/src/sw/driver/options.h
index eca274ab6..382731ab8 100644
--- a/src/sw/driver/options.h
+++ b/src/sw/driver/options.h
@@ -249,8 +249,7 @@ struct SW_DRIVER_CPP_API NativeLinkerOptionsData
     void remove(const LinkLibrary &l);
 };
 
-struct SW_DRIVER_CPP_API NativeCompilerOptions : IterableOptions<NativeCompilerOptions>,
-    NativeCompilerOptionsData
+struct SW_DRIVER_CPP_API NativeCompilerOptions : NativeCompilerOptionsData
 {
     NativeCompilerOptionsData System;
 
@@ -265,8 +264,7 @@ struct SW_DRIVER_CPP_API NativeCompilerOptions : IterableOptions<NativeCompilerO
     PathOptionsType gatherIncludeDirectories() const;
 };
 
-struct SW_DRIVER_CPP_API NativeLinkerOptions : IterableOptions<NativeLinkerOptions>,
-    NativeLinkerOptionsData
+struct SW_DRIVER_CPP_API NativeLinkerOptions : NativeLinkerOptionsData
 {
     // 1. remove dups somewhere: implement unique_vector
     // 2. move Dependencies out - ???
@@ -308,16 +306,13 @@ struct SW_DRIVER_CPP_API NativeLinkerOptions : IterableOptions<NativeLinkerOptio
 using UnresolvedDependenciesType = std::unordered_map<UnresolvedPackage, DependencyPtr>;
 
 struct SW_DRIVER_CPP_API NativeOptions : NativeCompilerOptions,
-    NativeLinkerOptions,
-    IterableOptions<NativeOptions>
+    NativeLinkerOptions
 {
     using NativeCompilerOptions::add;
     using NativeCompilerOptions::remove;
     using NativeLinkerOptions::add;
     using NativeLinkerOptions::remove;
 
-    using IterableOptions<NativeOptions>::iterate;
-
     void merge(const NativeOptions &o, const GroupSettings &s = GroupSettings());
 };
 
@@ -470,36 +465,15 @@ struct InheritanceGroup : T
         //Public.merge(g.Interface);
     }
 
-    template <class F, class ... Args>
-    void iterate(F &&f, const GroupSettings &s = GroupSettings())
-    {
-        auto s2 = s;
-
-        s2.Inheritance = InheritanceType::Private;
-        //T::template iterate<F, Args...>(std::forward<F>(f), s);
-        Private.template iterate<F, Args...>(std::forward<F>(f), s);
-        s2.Inheritance = InheritanceType::Protected;
-        Protected.template iterate<F, Args...>(std::forward<F>(f), s2);
-        s2.Inheritance = InheritanceType::Public;
-        Public.template iterate<F, Args...>(std::forward<F>(f), s2);
-        s2.Inheritance = InheritanceType::Interface;
-        Interface.template iterate<F, Args...>(std::forward<F>(f), s2);
-    }
-
-    template <class F, class ... Args>
-    void iterate(F &&f, const GroupSettings &s = GroupSettings()) const
+    template <class F>
+    void iterate(F &&f) const
     {
-        auto s2 = s;
-
-        s2.Inheritance = InheritanceType::Private;
-        //T::template iterate<F, Args...>(std::forward<F>(f), s);
-        Private.template iterate<F, Args...>(std::forward<F>(f), s);
-        s2.Inheritance = InheritanceType::Protected;
-        Protected.template iterate<F, Args...>(std::forward<F>(f), s2);
-        s2.Inheritance = InheritanceType::Public;
-        Public.template iterate<F, Args...>(std::forward<F>(f), s2);
-        s2.Inheritance = InheritanceType::Interface;
-        Interface.template iterate<F, Args...>(std::forward<F>(f), s2);
+        for (int i = toIndex(InheritanceType::Min); i < toIndex(InheritanceType::Max); i++)
+        {
+            auto s = getInheritanceStorage().raw()[i];
+            if (s)
+                f(*s, (InheritanceType)i);
+        }
     }
 
     // merge to T, always w/o interface
diff --git a/src/sw/driver/source_file.h b/src/sw/driver/source_file.h
index ba26225aa..2e02d632d 100644
--- a/src/sw/driver/source_file.h
+++ b/src/sw/driver/source_file.h
@@ -41,8 +41,7 @@ using SourceFileMap = std::unordered_map<path, std::shared_ptr<T>>;
  *
  */
  //template <class T>
-struct SW_DRIVER_CPP_API SourceFileStorage : protected SourceFileMap<SourceFile>,
-    IterableOptions<SourceFileStorage>
+struct SW_DRIVER_CPP_API SourceFileStorage : protected SourceFileMap<SourceFile>
 {
 public:
     using SourceFileMapThis = SourceFileMap<SourceFile>;
diff --git a/src/sw/driver/sw.h b/src/sw/driver/sw.h
index a537ea49a..fb2a3a06c 100644
--- a/src/sw/driver/sw.h
+++ b/src/sw/driver/sw.h
@@ -109,11 +109,6 @@ using sw::NativeLanguage;
 using sw::NativeSourceFile;
 using sw::NativeLinkerOptions;
 
-// TODO: remove
-using sw::WithSourceFileStorage;
-using sw::WithoutSourceFileStorage;
-using sw::WithNativeOptions;
-using sw::WithoutNativeOptions;
 //
 
 using sw::CommandLineOption;
diff --git a/src/sw/driver/target/base.h b/src/sw/driver/target/base.h
index 6978c2f37..bba75658d 100644
--- a/src/sw/driver/target/base.h
+++ b/src/sw/driver/target/base.h
@@ -469,11 +469,6 @@ struct SW_DRIVER_CPP_API ProjectTarget : ProjDirBase
     TargetType getType() const override { return TargetType::Project; }
 };
 
-struct WithSourceFileStorage {};
-struct WithoutSourceFileStorage {};
-struct WithNativeOptions {};
-struct WithoutNativeOptions {};
-
 //template <class ... Args>
 //struct SW_DRIVER_CPP_API TargetOptions : Args...
 struct SW_DRIVER_CPP_API TargetOptions : SourceFileStorage, NativeOptions
@@ -489,22 +484,6 @@ struct SW_DRIVER_CPP_API TargetOptions : SourceFileStorage, NativeOptions
     void add(const IncludeDirectory &i);
     void remove(const IncludeDirectory &i);
 
-    template <class F>
-    void iterate(F &&f, const GroupSettings &s = GroupSettings())
-    {
-        SourceFileStorage::iterate(std::forward<F>(f), s);
-        NativeOptions::iterate(std::forward<F>(f), s);
-    }
-
-    template <class F, class SFS, class NO, class ... Args>
-    void iterate(F &&f, const GroupSettings &s = GroupSettings())
-    {
-        if constexpr (std::is_same_v<SFS, WithSourceFileStorage>)
-            SourceFileStorage::iterate(std::forward<F>(f), s);
-        if constexpr (std::is_same_v<NO, WithNativeOptions>)
-            NativeOptions::iterate(std::forward<F>(f), s);
-    }
-
     void merge(const TargetOptions &g, const GroupSettings &s = GroupSettings())
     {
         SourceFileStorage::merge(g, s);
@@ -560,12 +539,6 @@ struct SW_DRIVER_CPP_API TargetOptionsGroup :
         InheritanceGroup<TargetOptions>::inheritance(g, s);
     }
 
-    template <class SFS, class NO, class F>
-    void iterate(F &&f, const GroupSettings &s = GroupSettings())
-    {
-        InheritanceGroup<TargetOptions>::iterate<F, SFS, NO>(std::forward<F>(f), s);
-    }
-
     // self merge
     void merge(const GroupSettings &s = GroupSettings())
     {
diff --git a/src/sw/driver/target/native.cpp b/src/sw/driver/target/native.cpp
index f6f83089b..78f8299c7 100644
--- a/src/sw/driver/target/native.cpp
+++ b/src/sw/driver/target/native.cpp
@@ -82,11 +82,10 @@ bool NativeExecutedTarget::init()
         Target::init();
 
         // propagate this pointer to all
-        TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+        TargetOptionsGroup::iterate([this](auto &v, auto i)
         {
             v.target = this;
         });
-        //LanguageStorage::target = this;
 
         Librarian = std::dynamic_pointer_cast<NativeLinker>(getSolution()->Settings.Native.Librarian->clone());
         Linker = std::dynamic_pointer_cast<NativeLinker>(getSolution()->Settings.Native.Linker->clone());
@@ -342,8 +341,8 @@ std::unordered_set<NativeSourceFile*> NativeExecutedTarget::gatherSourceFiles()
 Files NativeExecutedTarget::gatherIncludeDirectories() const
 {
     Files idirs;
-    ((NativeExecutedTarget*)this)->TargetOptionsGroup::iterate<WithoutSourceFileStorage, WithNativeOptions>(
-        [this, &idirs](auto &v, auto &s)
+    TargetOptionsGroup::iterate(
+        [this, &idirs](auto &v, auto i)
     {
         auto idirs2 = v.gatherIncludeDirectories();
         for (auto &i2 : idirs2)
@@ -1418,8 +1417,8 @@ bool NativeExecutedTarget::prepare()
         std::vector<DependencyPtr> deps_ordered;
 
         // set our initial deps
-        TargetOptionsGroup::iterate<WithoutSourceFileStorage, WithNativeOptions>(
-            [this, &deps, &deps_ordered](auto &v, auto &s)
+        TargetOptionsGroup::iterate(
+            [this, &deps, &deps_ordered](auto &v, auto i)
         {
             //DEBUG_BREAK_IF_STRING_HAS(getPackage().ppath.toString(), "sw.server.protos");
 
@@ -1430,7 +1429,7 @@ bool NativeExecutedTarget::prepare()
                 if (d->isDummy())
                     continue;
 
-                deps.emplace(d, s.Inheritance);
+                deps.emplace(d, i);
                 deps_ordered.push_back(d);
             }
         });
@@ -1450,11 +1449,11 @@ bool NativeExecutedTarget::prepare()
                 }
 
                 // iterate over child deps
-                (*(NativeExecutedTarget*)d->target).TargetOptionsGroup::iterate<WithoutSourceFileStorage, WithNativeOptions>(
-                    [this, &new_dependency, &deps, d = d.get(), &deps_ordered](auto &v, auto &s)
+                (*(NativeExecutedTarget*)d->target).TargetOptionsGroup::iterate(
+                    [this, &new_dependency, &deps, d = d.get(), &deps_ordered](auto &v, auto Inheritance)
                 {
                     // nothing to do with private inheritance
-                    if (s.Inheritance == InheritanceType::Private)
+                    if (Inheritance == InheritanceType::Private)
                         return;
 
                     for (auto &d2 : v.Dependencies)
@@ -1464,13 +1463,13 @@ bool NativeExecutedTarget::prepare()
                         if (d2->isDummy())
                             continue;
 
-                        if (s.Inheritance == InheritanceType::Protected && !hasSameParent(d2->target))
+                        if (Inheritance == InheritanceType::Protected && !hasSameParent(d2->target))
                             continue;
 
                         auto copy = std::make_shared<Dependency>(*d2);
                         auto[i, inserted] = deps.emplace(copy,
-                            s.Inheritance == InheritanceType::Interface ?
-                            InheritanceType::Public : s.Inheritance
+                            Inheritance == InheritanceType::Interface ?
+                            InheritanceType::Public : Inheritance
                         );
                         if (inserted)
                             deps_ordered.push_back(copy);
diff --git a/src/sw/driver/target/other.cpp b/src/sw/driver/target/other.cpp
index 145e9099b..15b6f4fd9 100644
--- a/src/sw/driver/target/other.cpp
+++ b/src/sw/driver/target/other.cpp
@@ -13,11 +13,10 @@ bool CSharpTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".cs"); p)
         compiler = std::dynamic_pointer_cast<CSharpCompiler>(p->clone());
@@ -68,11 +67,10 @@ bool RustTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".rs"); p)
         compiler = std::dynamic_pointer_cast<RustCompiler>(p->clone());
@@ -123,11 +121,10 @@ bool GoTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".go"); p)
         compiler = std::dynamic_pointer_cast<GoCompiler>(p->clone());
@@ -178,11 +175,10 @@ bool FortranTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".f"); p)
         compiler = std::dynamic_pointer_cast<FortranCompiler>(p->clone());
@@ -233,11 +229,10 @@ bool JavaTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".java"); p)
         compiler = std::dynamic_pointer_cast<JavaCompiler>(p->clone());
@@ -291,11 +286,10 @@ bool KotlinTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".kt"); p)
         compiler = std::dynamic_pointer_cast<KotlinCompiler>(p->clone());
@@ -346,11 +340,10 @@ bool DTarget::init()
     Target::init();
 
     // propagate this pointer to all
-    TargetOptionsGroup::iterate<WithSourceFileStorage, WithoutNativeOptions>([this](auto &v, auto &gs)
+    TargetOptionsGroup::iterate([this](auto &v, auto i)
     {
         v.target = this;
     });
-    //LanguageStorage::target = this;
 
     if (auto p = SourceFileStorage::findProgramByExtension(".d"); p)
         compiler = std::dynamic_pointer_cast<DCompiler>(p->clone());
diff --git a/src/sw/driver/types.h b/src/sw/driver/types.h
index 4d3a6ef5e..33ec0cfc9 100644
--- a/src/sw/driver/types.h
+++ b/src/sw/driver/types.h
@@ -218,22 +218,6 @@ struct SW_DRIVER_CPP_API GroupSettings
     bool include_directories_only = false;
 };
 
-template <class T>
-struct SW_DRIVER_CPP_API IterableOptions
-{
-    template <class F, class ... Args>
-    auto iterate(F &&f, const GroupSettings &s = GroupSettings())
-    {
-        std::forward<F>(f)(*(T *)this, s);
-    }
-
-    template <class F, class ... Args>
-    auto iterate(F &&f, const GroupSettings &s = GroupSettings()) const
-    {
-        std::forward<F>(f)(*(T *)this, s);
-    }
-};
-
 template <class F>
 struct stream_list_inserter : boost::assign::list_inserter<F>
 {