diff --git a/build_file.cpp b/build_file.cpp
index b44bb94..54f0ff6 100644
--- a/build_file.cpp
+++ b/build_file.cpp
@@ -1,25 +1,59 @@
 #include "build_tool/library.cpp"
 
-void Compile(Strs cc, Str files);
+void Compile(S8_String cc, S8_String files);
 int ReturnValue = 0;
 
 int Main() {
-    Strs cc = CMDLine.get("cc"_s, ON_WINDOWS("cl"_s) ON_MAC("clang"_s) ON_LINUX("gcc"_s));
+    S8_String cc = CMDLine.get("cc", ON_WINDOWS("cl") ON_MAC("clang") ON_LINUX("gcc"));
     Compile(cc, "../tests/test_main.cpp");
     Compile(cc, "../tests/test_filesystem.c");
 
     return ReturnValue;
 }
 
-void Compile(Strs cc, Str file) {
+void Compile(S8_String cc, S8_String file) {
     int result = 0;
-    Str exe = FilenameWithoutExt(file);
-    bool is_cpp = S8_EndsWith(file, ".cpp");
-    if (cc == "gcc" && is_cpp) result = OS_SystemF("g++ -o %.*s.exe %.*s -g -Wno-write-strings -fsanitize=address", S8_Expand(exe), S8_Expand(file));
-    else if (cc == "gcc" && !is_cpp) result = OS_SystemF("g -o %.*s.exe %.*s -g -Wno-write-strings -fsanitize=address", S8_Expand(exe), S8_Expand(file));
-    else if (cc == "clang" && is_cpp) result = OS_SystemF("clang++ -std=c++11 -o %.*s.exe %.*s -fdiagnostics-absolute-paths -g -Wno-writable-strings -fsanitize=address", S8_Expand(exe), S8_Expand(file));
-    else if (cc == "clang" && !is_cpp) result = OS_SystemF("clang -o %.*s.exe %.*s -fdiagnostics-absolute-paths -g -Wno-writable-strings -fsanitize=address", S8_Expand(exe), S8_Expand(file));
-    else result = OS_SystemF("cl -Fe:%.*s.exe %.*s -FC -Zi -WX -W3 -wd4200 -diagnostics:column -nologo -D_CRT_SECURE_NO_WARNINGS -fsanitize=address -RTC1", S8_Expand(exe), S8_Expand(file));
+
+    S8_String name_no_ext = S8_GetNameNoExt(file);
+    S8_String exe = Fmt("%.*s.exe", S8_Expand(name_no_ext));
+
+    if (cc == "cl") {
+        Array<S8_String> flags = Split("/MP /Zi -D_CRT_SECURE_NO_WARNINGS /GF /Gm- /Oi");
+        flags += Split("/FC /WX /W3 /wd4200 /diagnostics:column /nologo");
+        flags += Split("/GR- /EHa-");
+        flags += Split("-fsanitize=address -RTC1");
+
+        Array<S8_String> link = Split("/link /incremental:no");
+        S8_String name = Fmt("/Fe:%.*s", S8_Expand(exe));
+
+        result = Run(cc + file + name + flags + link);
+    }
+    else if (cc == "clang") {
+        Array<S8_String> flags = Split("-g -Wno-write-strings -fdiagnostics-absolute-paths");
+        flags += "-fsanitize=address";
+
+        if (S8_EndsWith(file, ".cpp")) {
+            cc = "clang++";
+            flags += "-std=c++11";
+        }
+
+        S8_String name = Fmt("-o %.*s", S8_Expand(exe));
+        result = Run(cc + file + name + flags);
+    }
+    else {
+        IO_Assert(cc == "gcc");
+
+        Array<S8_String> flags = Split("-g -Wno-write-strings");
+        flags += "-fsanitize=address";
+
+        if (S8_EndsWith(file, ".cpp")) {
+            cc = "g++";
+            flags += "-std=c++11";
+        }
+
+        S8_String name = Fmt("-o %.*s", S8_Expand(exe));
+        result = Run(cc + file + name + flags);
+    }
 
     if (result == 0) result = OS_SystemF(IF_WINDOWS_ELSE("", "./") "%.*s.exe", S8_Expand(exe));
     else ReturnValue = result;
diff --git a/build_tool/easy_strings.cpp b/build_tool/easy_strings.cpp
new file mode 100644
index 0000000..43f8649
--- /dev/null
+++ b/build_tool/easy_strings.cpp
@@ -0,0 +1,100 @@
+S8_String Fmt(const char *str, ...) S8__PrintfFormat(1, 2);
+
+Array<S8_String> operator+(Array<S8_String> a, Array<S8_String> b) {
+    Array<S8_String> c = a.copy(*Perm);
+    c.add_array(b);
+    return c;
+}
+
+Array<S8_String> operator+(Array<S8_String> a, S8_String b) {
+    Array<S8_String> c = a.copy(*Perm);
+    c.add(b);
+    return c;
+}
+
+Array<S8_String> operator+(S8_String a, Array<S8_String> b) {
+    Array<S8_String> c = b.copy(*Perm);
+    c.insert(a, 0);
+    return c;
+}
+
+Array<S8_String> operator+(S8_String a, S8_String b) {
+    Array<S8_String> c = {*Perm};
+    c.add(a);
+    c.add(b);
+    return c;
+}
+
+Array<S8_String> &operator+=(Array<S8_String> &a, Array<S8_String> b) {
+    a.add_array(b);
+    return a;
+}
+
+Array<S8_String> &operator+=(Array<S8_String> &a, S8_String s) {
+    a.add(s);
+    return a;
+}
+
+//@todo: split on any whitespace instead!
+Array<S8_String> Split(char *str) {
+    S8_String s = S8_MakeFromChar(str);
+    S8_List list = S8_Split(Perm, s, S8_Lit(" "), 0);
+
+    Array<S8_String> result = {*Perm};
+    S8_For(it, list) result.add(it->string);
+    return result;
+}
+
+S8_String Merge(Array<S8_String> list, S8_String separator = " "_s) {
+    int64_t char_count = 0;
+    For(list) char_count += it.len;
+    if (char_count == 0) return {};
+    int64_t node_count = list.len;
+
+    int64_t base_size = (char_count + 1);
+    int64_t sep_size = (node_count - 1) * separator.len;
+    int64_t size = base_size + sep_size;
+    char *buff = (char *)MA_PushSize(Perm, sizeof(char) * size);
+    S8_String string = S8_Make(buff, 0);
+    For(list) {
+        IO_Assert(string.len + it.len <= size);
+        MA_MemoryCopy(string.str + string.len, it.str, it.len);
+        string.len += it.len;
+        if (!list.is_last(it)) {
+            MA_MemoryCopy(string.str + string.len, separator.str, separator.len);
+            string.len += separator.len;
+        }
+    }
+    IO_Assert(string.len == size - 1);
+    string.str[size] = 0;
+    return string;
+}
+
+S8_String Fmt(const char *str, ...) {
+    S8_FORMAT(Perm, str, str_fmt);
+    return str_fmt;
+}
+
+bool CodeWasModified(S8_String str, S8_String artifact = {}) {
+    return SRC_WasModified(str, artifact);
+}
+
+S8_String IfCodeWasModified(S8_String cfile, S8_String objfile) {
+    Array<S8_String> result = {};
+    if (SRC_WasModified(cfile, objfile))
+        return cfile;
+    return objfile;
+}
+
+int Run(Array<S8_String> s) {
+    S8_String cmd = Merge(s);
+    return OS_SystemF("%.*s", S8_Expand(cmd));
+}
+
+Array<S8_String> ListDir(char *dir) {
+    Array<S8_String> result = {};
+    for (OS_FileIter it = OS_IterateFiles(Perm, S8_MakeFromChar(dir)); OS_IsValid(it); OS_Advance(&it)) {
+        result.add(S8_Copy(Perm, it.absolute_path));
+    }
+    return result;
+}
diff --git a/build_tool/library.cpp b/build_tool/library.cpp
index f026af9..230afad 100644
--- a/build_tool/library.cpp
+++ b/build_tool/library.cpp
@@ -4,8 +4,7 @@ FLAGS        = /MP /Zi /FC /WX /W3 /wd4200 /diagnostics:column /nologo -D_CRT_SE
 LINK         = /link /incremental:no
 STD_OFF      = /GR- /EHa-
 STD_ON       = /EHsc
-DEBUG        = -Od -D_DEBUG -MDd -fsanitize=address -RTC1
-DEBUG_LINK   = -NODEFAULTLIB:LIBCMT
+DEBUG        = -Od -D_DEBUG -fsanitize=address -RTC1
 RELEASE      = -O2 -MT -DNDEBUG -GL
 RELEASE_LINK = -opt:ref -opt:icf
 ----------------- CL.EXE -----------------
@@ -48,175 +47,18 @@ MA_Arena *Perm = &PernamentArena;
 Table<S8_String> CMDLine;
 
 #include "cache.cpp"
+#include "easy_strings.cpp"
 
-//
-//
-//
+#ifndef BUILD_MAIN
+int Main();
 
-using Str = S8_String;
-struct Strs : Array<Str> {
-    Strs() = default;
-    Strs(char *str) {
-        *this = {};
-        this->add(S8_MakeFromChar(str));
-    }
-    Strs(char *a, char *b) {
-        *this = {};
-        this->add(S8_MakeFromChar(a));
-        this->add(S8_MakeFromChar(b));
-    }
-    Strs(char *a, char *b, char *c) {
-        *this = {};
-        this->add(S8_MakeFromChar(a));
-        this->add(S8_MakeFromChar(b));
-        this->add(S8_MakeFromChar(c));
-    }
-    Strs(Str a) {
-        *this = {};
-        this->add(a);
-    }
-    Strs(Array<Str> a) { MA_MemoryCopy(this, &a, sizeof(a)); }
-};
-
-bool operator==(Strs a, char *b) {
-    if (a.len != 1) return false;
-    bool result = a[0] == S8_MakeFromChar(b);
-    return result;
-}
-
-bool operator==(Strs a, const char *b) {
-    if (a.len != 1) return false;
-    bool result = a[0] == S8_MakeFromChar((char *)b);
-    return result;
-}
-
-Strs operator+(Strs a, Strs b) {
-    Strs c = {a.copy(*Perm)};
-    c.add_array(b);
-    return c;
-}
-
-Strs operator+(Strs a, Str b) {
-    Strs c = {a.copy(*Perm)};
-    c.add(b);
-    return c;
-}
-
-Strs operator+(Str a, Strs b) {
-    Strs c = {b.copy(*Perm)};
-    c.add(a);
-    return c;
-}
-
-Strs &operator+=(Strs &a, Strs b) {
-    a.add_array(b);
-    return a;
-}
-
-Strs &operator+=(Strs &a, char *str) {
-    a.add(S8_MakeFromChar(str));
-    return a;
-}
-
-Strs &operator+=(Strs &a, Str s) {
-    a.add(s);
-    return a;
-}
-
-Strs operator+(Strs a, char *b) {
-    Strs c = {a.copy(*Perm)};
-    c.add(S8_MakeFromChar(b));
-    return c;
-}
-
-Strs operator+(char *a, Strs b) {
-    Strs c = {b.copy(*Perm)};
-    c.add(S8_MakeFromChar(a));
-    return c;
-}
-
-Strs operator+(Str a, Str b) {
-    Strs c = {};
-    c.add(a);
-    c.add(b);
-    return c;
-}
-
-Strs operator+(Str a, char *b) {
-    return a + S8_MakeFromChar(b);
-}
-
-//@todo: split on any whitespace instead!
-Strs Split(char *str) {
-    Str s = S8_MakeFromChar(str);
-    S8_List list = S8_Split(Perm, s, S8_Lit(" "), 0);
-
-    Strs result = {};
-    S8_For(it, list) result.add(it->string);
-    return result;
-}
-
-Str Merge(Strs list, Str separator = " "_s) {
-    int64_t char_count = 0;
-    For(list) char_count += it.len;
-    if (char_count == 0) return {};
-    int64_t node_count = list.len;
-
-    int64_t base_size = (char_count + 1);
-    int64_t sep_size = (node_count - 1) * separator.len;
-    int64_t size = base_size + sep_size;
-    char *buff = (char *)MA_PushSize(Perm, sizeof(char) * size);
-    Str string = S8_Make(buff, 0);
-    For(list) {
-        IO_Assert(string.len + it.len <= size);
-        MA_MemoryCopy(string.str + string.len, it.str, it.len);
-        string.len += it.len;
-        if (!list.is_last(it)) {
-            MA_MemoryCopy(string.str + string.len, separator.str, separator.len);
-            string.len += separator.len;
-        }
-    }
-    IO_Assert(string.len == size - 1);
-    string.str[size] = 0;
-    return string;
-}
-
-S8_String FilenameWithoutExt(S8_String it) { return S8_SkipToLastSlash(S8_ChopLastPeriod(it)); }
-bool CodeWasModified(char *str, char *artifact = 0) { return SRC_WasModified(S8_MakeFromChar(str), S8_MakeFromChar(artifact)); }
-bool CodeWasModified(S8_String str, S8_String artifact = {}) { return SRC_WasModified(str, artifact); }
-Strs IfCodeWasModified(char *cfile, char *objfile) {
-    Strs result = {};
-    S8_String s = S8_MakeFromChar(cfile);
-    S8_String o = S8_MakeFromChar(objfile);
-    if (SRC_WasModified(s, o)) {
-        return cfile;
-    }
-    return objfile;
-}
-void MakeDir(char *str) { OS_MakeDir(S8_MakeFromChar(str)); }
-void ChangeDir(char *str) { OS_SetWorkingDir(S8_MakeFromChar(str)); }
-int Run(Strs s) {
-    Str cmd = Merge(s);
-    return OS_SystemF("%.*s", S8_Expand(cmd));
-}
-
-Strs ListDir(char *dir) {
-    Strs result = {};
-    for (OS_FileIter it = OS_IterateFiles(Perm, S8_MakeFromChar(dir)); OS_IsValid(it); OS_Advance(&it)) {
-        result.add(S8_Copy(Perm, it.absolute_path));
-    }
-    return result;
-}
-
-void ReportError(S8_String it) {
+void BUILD_ReportError(S8_String it) {
     IO_FatalErrorf("Invalid command line argument syntax! Expected a key value pair!\n"
                    "Here is the wrong argument: %.*s\n"
                    "Here is a good example: bld.exe profile=release platform=windows\n",
                    S8_Expand(it));
 }
 
-#ifndef BUILD_MAIN
-int Main();
 int main(int argc, char **argv) {
 
     if (argc > 1) IO_Printf("Command line arguments:\n");
@@ -227,13 +69,13 @@ int main(int argc, char **argv) {
         if (S8_Seek(it, "="_s, 0, &idx)) {
             S8_String key = S8_GetPrefix(it, idx);
             S8_String value = S8_Skip(it, idx + 1);
-            if (key.len == 0) ReportError(it);
-            if (value.len == 0) ReportError(it);
+            if (key.len == 0) BUILD_ReportError(it);
+            if (value.len == 0) BUILD_ReportError(it);
             IO_Printf("[%d] %.*s = %.*s\n", i, S8_Expand(key), S8_Expand(value));
 
             CMDLine.put(key, value);
         }
-        else ReportError(it);
+        else BUILD_ReportError(it);
     }
 
     SRC_InitCache(Perm, S8_Lit("build_file.cache"));
diff --git a/build_tool/main.cpp b/build_tool/main.cpp
index 711b8b4..741da19 100644
--- a/build_tool/main.cpp
+++ b/build_tool/main.cpp
@@ -49,7 +49,7 @@ int main(int argument_count, char **arguments) {
             result = OS_SystemF("cl %.*s -Fe:%.*s -WX -W3 -wd4200 -diagnostics:column -nologo -Zi", S8_Expand(build_file), S8_Expand(exe_name));
         }
         else if (cc == "clang"_s) {
-            result = OS_SystemF("clang++ -std=c++11 -Wno-writable-strings %.*s -o %.*s -g", S8_Expand(build_file), S8_Expand(exe_name));
+            result = OS_SystemF("clang++ -std=c++11 -fdiagnostics-absolute-paths -Wno-writable-strings %.*s -o %.*s -g", S8_Expand(build_file), S8_Expand(exe_name));
         }
         else {
             IO_Assert(cc == "gcc"_s);
diff --git a/standalone_libraries/string.h b/standalone_libraries/string.h
index a622f07..4ab3887 100644
--- a/standalone_libraries/string.h
+++ b/standalone_libraries/string.h
@@ -36,12 +36,6 @@ struct S8_String {
     struct Iter {
         UTF8_Iter i;
 
-        Iter operator++(int) {
-            Iter ret = *this;
-            UTF8_Advance(&i);
-            return ret;
-        }
-
         Iter &operator++() {
             UTF8_Advance(&i);
             return *this;
@@ -67,6 +61,23 @@ struct S8_List {
     int64_t char_count;
     S8_Node *first;
     S8_Node *last;
+
+#if defined(__cplusplus)
+    struct Iter {
+        S8_Node *it;
+
+        Iter &operator++() {
+            it = it->next;
+            return *this;
+        }
+
+        friend bool operator!=(const Iter &a, const Iter &b) { return a.it != b.it; }
+        S8_String &operator*() { return it->string; }
+    };
+
+    Iter begin() { return {first}; }
+    Iter end() { return {0}; }
+#endif
 };
 
 typedef int S8_FindFlag;
diff --git a/tests/test_main.cpp b/tests/test_main.cpp
index e2440c0..83420f0 100644
--- a/tests/test_main.cpp
+++ b/tests/test_main.cpp
@@ -4,6 +4,7 @@
 #include "test_arena.cpp"
 
 void TestClexer();
+
 int main() {
     TestSimpleInsertAndIntegrity();
     TestStrings();
@@ -22,7 +23,7 @@ int main() {
 
     TestClexer();
 
-    // Unicode iteration over codepoints
+    // Unicode iteration over codepoints using For
     {
         S8_String s = "mrówka";
 
@@ -35,6 +36,23 @@ int main() {
         }
         IO_Assert(found_two_byte);
     }
+
+    // List iteration using For
+    {
+        MA_Scratch scratch;
+        S8_List list = {};
+        S8_AddF(scratch, &list, "1");
+        S8_AddF(scratch, &list, "2");
+        S8_AddF(scratch, &list, "3");
+        S8_AddF(scratch, &list, "4");
+        S8_AddF(scratch, &list, "5");
+
+        int i = 0;
+        For(list) {
+            i += 1;
+        }
+        IO_Assert(i == 5);
+    }
 }
 
 #define CL_Allocator MA_Arena *