diff --git a/.flake8 b/.flake8
new file mode 100644
index 00000000..3dd31e6e
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+# E203: whitespace before ':'
+# E501: line too long
+extend-ignore = E203,E501
diff --git a/configure.py b/configure.py
index 7fd2f1ea..11791df0 100644
--- a/configure.py
+++ b/configure.py
@@ -117,10 +117,11 @@ if not is_windows():
     config.wrapper = args.wrapper
 
 # Tool versions
+config.binutils_tag = "2.42-1"
 config.compilers_tag = "20231018"
-config.dtk_tag = "v0.6.3"
+config.dtk_tag = "v0.7.4"
 config.sjiswrap_tag = "v1.1.1"
-config.wibo_tag = "0.6.3"
+config.wibo_tag = "0.6.11"
 
 # Project
 config.config_path = Path("config") / config.version / "config.yml"
diff --git a/tools/decompctx.py b/tools/decompctx.py
index c42b1828..e86d5ef3 100644
--- a/tools/decompctx.py
+++ b/tools/decompctx.py
@@ -13,60 +13,74 @@
 import argparse
 import os
 import re
+from typing import List
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 root_dir = os.path.abspath(os.path.join(script_dir, ".."))
 src_dir = os.path.join(root_dir, "src")
-include_dir = os.path.join(root_dir, "include")
+include_dirs = [
+    os.path.join(root_dir, "include"),
+    # Add additional include directories here
+]
 
 include_pattern = re.compile(r'^#include\s*[<"](.+?)[>"]$')
-guard_pattern = re.compile(r'^#ifndef\s+(.*)$')
+guard_pattern = re.compile(r"^#ifndef\s+(.*)$")
 
 defines = set()
 
-def import_h_file(in_file: str, r_path: str) -> str:
-    rel_path = os.path.join(root_dir, r_path, in_file)
-    inc_path = os.path.join(include_dir, in_file)
-    if os.path.exists(rel_path):
-      return import_c_file(rel_path)
-    elif os.path.exists(inc_path):
-      return import_c_file(inc_path)
-    else:
-      print("Failed to locate", in_file)
-      exit(1)
 
-def import_c_file(in_file) -> str:
+def import_h_file(in_file: str, r_path: str, deps: List[str]) -> str:
+    rel_path = os.path.join(root_dir, r_path, in_file)
+    if os.path.exists(rel_path):
+        return import_c_file(rel_path, deps)
+    for include_dir in include_dirs:
+        inc_path = os.path.join(include_dir, in_file)
+        if os.path.exists(inc_path):
+            return import_c_file(inc_path, deps)
+    else:
+        print("Failed to locate", in_file)
+        return ""
+
+
+def import_c_file(in_file: str, deps: List[str]) -> str:
     in_file = os.path.relpath(in_file, root_dir)
-    out_text = ''
+    deps.append(in_file)
+    out_text = ""
 
     try:
-      with open(in_file, encoding="utf-8") as file:
-        out_text += process_file(in_file, list(file))
+        with open(in_file, encoding="utf-8") as file:
+            out_text += process_file(in_file, list(file), deps)
     except Exception:
-      with open(in_file) as file:
-        out_text += process_file(in_file, list(file))
+        with open(in_file) as file:
+            out_text += process_file(in_file, list(file), deps)
     return out_text
 
-def process_file(in_file: str, lines) -> str:
-    out_text = ''
+
+def process_file(in_file: str, lines: List[str], deps: List[str]) -> str:
+    out_text = ""
     for idx, line in enumerate(lines):
-      guard_match = guard_pattern.match(line.strip())
-      if idx == 0:
-        if guard_match:
-          if guard_match[1] in defines:
-            break
-          defines.add(guard_match[1])
-        print("Processing file", in_file)
-      include_match = include_pattern.match(line.strip())
-      if include_match and not include_match[1].endswith(".s"):
-        out_text += f"/* \"{in_file}\" line {idx} \"{include_match[1]}\" */\n"
-        out_text += import_h_file(include_match[1], os.path.dirname(in_file))
-        out_text += f"/* end \"{include_match[1]}\" */\n"
-      else:
-        out_text += line
+        guard_match = guard_pattern.match(line.strip())
+        if idx == 0:
+            if guard_match:
+                if guard_match[1] in defines:
+                    break
+                defines.add(guard_match[1])
+            print("Processing file", in_file)
+        include_match = include_pattern.match(line.strip())
+        if include_match and not include_match[1].endswith(".s"):
+            out_text += f'/* "{in_file}" line {idx} "{include_match[1]}" */\n'
+            out_text += import_h_file(include_match[1], os.path.dirname(in_file), deps)
+            out_text += f'/* end "{include_match[1]}" */\n'
+        else:
+            out_text += line
 
     return out_text
 
+
+def sanitize_path(path: str) -> str:
+    return path.replace("\\", "/").replace(" ", "\\ ")
+
+
 def main():
     parser = argparse.ArgumentParser(
         description="""Create a context file which can be used for decomp.me"""
@@ -75,13 +89,32 @@ def main():
         "c_file",
         help="""File from which to create context""",
     )
+    parser.add_argument(
+        "-o",
+        "--output",
+        help="""Output file""",
+        default="ctx.c",
+    )
+    parser.add_argument(
+        "-d",
+        "--depfile",
+        help="""Dependency file""",
+    )
     args = parser.parse_args()
 
-    output = import_c_file(args.c_file)
+    deps = []
+    output = import_c_file(args.c_file, deps)
 
-    with open(os.path.join(root_dir, "ctx.c"), "w", encoding="utf-8") as f:
+    with open(os.path.join(root_dir, args.output), "w", encoding="utf-8") as f:
         f.write(output)
 
+    if args.depfile:
+        with open(os.path.join(root_dir, args.depfile), "w", encoding="utf-8") as f:
+            f.write(sanitize_path(args.output) + ":")
+            for dep in deps:
+                path = sanitize_path(dep)
+                f.write(f" \\\n\t{path}")
+
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/tools/download_tool.py b/tools/download_tool.py
index 681c65b5..7b386a4b 100644
--- a/tools/download_tool.py
+++ b/tools/download_tool.py
@@ -16,14 +16,31 @@ import os
 import platform
 import shutil
 import stat
-import sys
 import urllib.request
 import zipfile
-
+from typing import Callable, Dict
 from pathlib import Path
 
 
-def dtk_url(tag):
+def binutils_url(tag):
+    uname = platform.uname()
+    system = uname.system.lower()
+    arch = uname.machine.lower()
+    if system == "darwin":
+        system = "macos"
+        arch = "universal"
+    elif arch == "amd64":
+        arch = "x86_64"
+
+    repo = "https://github.com/encounter/gc-wii-binutils"
+    return f"{repo}/releases/download/{tag}/{system}-{arch}.zip"
+
+
+def compilers_url(tag: str) -> str:
+    return f"https://files.decomp.dev/compilers_{tag}.zip"
+
+
+def dtk_url(tag: str) -> str:
     uname = platform.uname()
     suffix = ""
     system = uname.system.lower()
@@ -39,28 +56,26 @@ def dtk_url(tag):
     return f"{repo}/releases/download/{tag}/dtk-{system}-{arch}{suffix}"
 
 
-def sjiswrap_url(tag):
+def sjiswrap_url(tag: str) -> str:
     repo = "https://github.com/encounter/sjiswrap"
     return f"{repo}/releases/download/{tag}/sjiswrap-windows-x86.exe"
 
 
-def wibo_url(tag):
+def wibo_url(tag: str) -> str:
     repo = "https://github.com/decompals/wibo"
     return f"{repo}/releases/download/{tag}/wibo"
 
 
-def compilers_url(tag):
-    return f"https://files.decomp.dev/compilers_{tag}.zip"
-
-TOOLS = {
+TOOLS: Dict[str, Callable[[str], str]] = {
+    "binutils": binutils_url,
+    "compilers": compilers_url,
     "dtk": dtk_url,
     "sjiswrap": sjiswrap_url,
     "wibo": wibo_url,
-    "compilers": compilers_url,
 }
 
 
-def main():
+def main() -> None:
     parser = argparse.ArgumentParser()
     parser.add_argument("tool", help="Tool name")
     parser.add_argument("output", type=Path, help="output file path")
@@ -77,7 +92,11 @@ def main():
             data = io.BytesIO(response.read())
             with zipfile.ZipFile(data) as f:
                 f.extractall(output)
-            output.touch(mode=0o755)
+            # Make all files executable
+            for root, _, files in os.walk(output):
+                for name in files:
+                    os.chmod(os.path.join(root, name), 0o755)
+            output.touch(mode=0o755)  # Update dir modtime
         else:
             with open(output, "wb") as f:
                 shutil.copyfileobj(response, f)
@@ -86,4 +105,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/tools/ninja_syntax.py b/tools/ninja_syntax.py
index ffd88a01..97e71f26 100644
--- a/tools/ninja_syntax.py
+++ b/tools/ninja_syntax.py
@@ -21,50 +21,66 @@ use Python.
 
 import re
 import textwrap
+from io import StringIO
+from pathlib import Path
+from typing import Dict, List, Match, Optional, Tuple, Union
+
+NinjaPath = Union[str, Path]
+NinjaPaths = Union[
+    List[str],
+    List[Path],
+    List[NinjaPath],
+    List[Optional[str]],
+    List[Optional[Path]],
+    List[Optional[NinjaPath]],
+]
+NinjaPathOrPaths = Union[NinjaPath, NinjaPaths]
 
 
-def escape_path(word):
+def escape_path(word: str) -> str:
     return word.replace("$ ", "$$ ").replace(" ", "$ ").replace(":", "$:")
 
 
 class Writer(object):
-    def __init__(self, output, width=78):
+    def __init__(self, output: StringIO, width: int = 78) -> None:
         self.output = output
         self.width = width
 
-    def newline(self):
+    def newline(self) -> None:
         self.output.write("\n")
 
-    def comment(self, text):
+    def comment(self, text: str) -> None:
         for line in textwrap.wrap(
             text, self.width - 2, break_long_words=False, break_on_hyphens=False
         ):
             self.output.write("# " + line + "\n")
 
-    def variable(self, key, value, indent=0):
-        if value is None:
-            return
-        if isinstance(value, list):
-            value = " ".join(filter(None, value))  # Filter out empty strings.
+    def variable(
+        self,
+        key: str,
+        value: Optional[NinjaPathOrPaths],
+        indent: int = 0,
+    ) -> None:
+        value = " ".join(serialize_paths(value))
         self._line("%s = %s" % (key, value), indent)
 
-    def pool(self, name, depth):
+    def pool(self, name: str, depth: int) -> None:
         self._line("pool %s" % name)
-        self.variable("depth", depth, indent=1)
+        self.variable("depth", str(depth), indent=1)
 
     def rule(
         self,
-        name,
-        command,
-        description=None,
-        depfile=None,
-        generator=False,
-        pool=None,
-        restat=False,
-        rspfile=None,
-        rspfile_content=None,
-        deps=None,
-    ):
+        name: str,
+        command: str,
+        description: Optional[str] = None,
+        depfile: Optional[NinjaPath] = None,
+        generator: bool = False,
+        pool: Optional[str] = None,
+        restat: bool = False,
+        rspfile: Optional[NinjaPath] = None,
+        rspfile_content: Optional[NinjaPath] = None,
+        deps: Optional[NinjaPathOrPaths] = None,
+    ) -> None:
         self._line("rule %s" % name)
         self.variable("command", command, indent=1)
         if description:
@@ -86,32 +102,39 @@ class Writer(object):
 
     def build(
         self,
-        outputs,
-        rule,
-        inputs=None,
-        implicit=None,
-        order_only=None,
-        variables=None,
-        implicit_outputs=None,
-        pool=None,
-        dyndep=None,
-    ):
-        outputs = as_list(outputs)
+        outputs: NinjaPathOrPaths,
+        rule: str,
+        inputs: Optional[NinjaPathOrPaths] = None,
+        implicit: Optional[NinjaPathOrPaths] = None,
+        order_only: Optional[NinjaPathOrPaths] = None,
+        variables: Optional[
+            Union[
+                List[Tuple[str, Optional[NinjaPathOrPaths]]],
+                Dict[str, Optional[NinjaPathOrPaths]],
+            ]
+        ] = None,
+        implicit_outputs: Optional[NinjaPathOrPaths] = None,
+        pool: Optional[str] = None,
+        dyndep: Optional[NinjaPath] = None,
+    ) -> List[str]:
+        outputs = serialize_paths(outputs)
         out_outputs = [escape_path(x) for x in outputs]
-        all_inputs = [escape_path(x) for x in as_list(inputs)]
+        all_inputs = [escape_path(x) for x in serialize_paths(inputs)]
 
         if implicit:
-            implicit = [escape_path(x) for x in as_list(implicit)]
+            implicit = [escape_path(x) for x in serialize_paths(implicit)]
             all_inputs.append("|")
-            all_inputs.extend(implicit)
+            all_inputs.extend(map(str, implicit))
         if order_only:
-            order_only = [escape_path(x) for x in as_list(order_only)]
+            order_only = [escape_path(x) for x in serialize_paths(order_only)]
             all_inputs.append("||")
-            all_inputs.extend(order_only)
+            all_inputs.extend(map(str, order_only))
         if implicit_outputs:
-            implicit_outputs = [escape_path(x) for x in as_list(implicit_outputs)]
+            implicit_outputs = [
+                escape_path(x) for x in serialize_paths(implicit_outputs)
+            ]
             out_outputs.append("|")
-            out_outputs.extend(implicit_outputs)
+            out_outputs.extend(map(str, implicit_outputs))
 
         self._line(
             "build %s: %s" % (" ".join(out_outputs), " ".join([rule] + all_inputs))
@@ -119,7 +142,7 @@ class Writer(object):
         if pool is not None:
             self._line("  pool = %s" % pool)
         if dyndep is not None:
-            self._line("  dyndep = %s" % dyndep)
+            self._line("  dyndep = %s" % serialize_path(dyndep))
 
         if variables:
             if isinstance(variables, dict):
@@ -132,16 +155,16 @@ class Writer(object):
 
         return outputs
 
-    def include(self, path):
+    def include(self, path: str) -> None:
         self._line("include %s" % path)
 
-    def subninja(self, path):
+    def subninja(self, path: str) -> None:
         self._line("subninja %s" % path)
 
-    def default(self, paths):
-        self._line("default %s" % " ".join(as_list(paths)))
+    def default(self, paths: NinjaPathOrPaths) -> None:
+        self._line("default %s" % " ".join(serialize_paths(paths)))
 
-    def _count_dollars_before_index(self, s, i):
+    def _count_dollars_before_index(self, s: str, i: int) -> int:
         """Returns the number of '$' characters right in front of s[i]."""
         dollar_count = 0
         dollar_index = i - 1
@@ -150,7 +173,7 @@ class Writer(object):
             dollar_index -= 1
         return dollar_count
 
-    def _line(self, text, indent=0):
+    def _line(self, text: str, indent: int = 0) -> None:
         """Write 'text' word-wrapped at self.width characters."""
         leading_space = "  " * indent
         while len(leading_space) + len(text) > self.width:
@@ -187,19 +210,21 @@ class Writer(object):
 
         self.output.write(leading_space + text + "\n")
 
-    def close(self):
+    def close(self) -> None:
         self.output.close()
 
 
-def as_list(input):
-    if input is None:
-        return []
+def serialize_path(input: Optional[NinjaPath]) -> str:
+    return str(input).replace("\\", "/") if input else ""
+
+
+def serialize_paths(input: Optional[NinjaPathOrPaths]) -> List[str]:
     if isinstance(input, list):
-        return input
-    return [input]
+        return [serialize_path(path) for path in input if path]
+    return [serialize_path(input)] if input else []
 
 
-def escape(string):
+def escape(string: str) -> str:
     """Escape a string such that it can be embedded into a Ninja file without
     further interpretation."""
     assert "\n" not in string, "Ninja syntax does not allow newlines"
@@ -207,17 +232,17 @@ def escape(string):
     return string.replace("$", "$$")
 
 
-def expand(string, vars, local_vars={}):
+def expand(string: str, vars: Dict[str, str], local_vars: Dict[str, str] = {}) -> str:
     """Expand a string containing $vars as Ninja would.
 
     Note: doesn't handle the full Ninja variable syntax, but it's enough
     to make configure.py's use of it work.
     """
 
-    def exp(m):
+    def exp(m: Match[str]) -> str:
         var = m.group(1)
         if var == "$":
             return "$"
         return local_vars.get(var, vars.get(var, ""))
 
-    return re.sub(r"\$(\$|\w*)", exp, string)
\ No newline at end of file
+    return re.sub(r"\$(\$|\w*)", exp, string)
diff --git a/tools/project.py b/tools/project.py
index 0f5ad89b..991b94a9 100644
--- a/tools/project.py
+++ b/tools/project.py
@@ -12,11 +12,13 @@
 
 import io
 import json
+import math
 import os
 import platform
 import sys
-
 from pathlib import Path
+from typing import Any, Dict, List, Optional, Set, Tuple, Union
+
 from . import ninja_syntax
 
 if sys.platform == "cygwin":
@@ -27,46 +29,85 @@ if sys.platform == "cygwin":
     )
 
 
+class Object:
+    def __init__(self, completed: bool, name: str, **options: Any) -> None:
+        self.name = name
+        self.base_name = Path(name).with_suffix("")
+        self.completed = completed
+        self.options: Dict[str, Any] = {
+            "add_to_all": True,
+            "asflags": None,
+            "extra_asflags": None,
+            "cflags": None,
+            "extra_cflags": None,
+            "mw_version": None,
+            "shift_jis": None,
+            "source": name,
+        }
+        self.options.update(options)
+
+
+PathLike = Union[str, os.PathLike]
+
+
 class ProjectConfig:
-    def __init__(self):
+    def __init__(self) -> None:
         # Paths
-        self.build_dir = Path("build")
-        self.src_dir = Path("src")
-        self.tools_dir = Path("tools")
+        self.build_dir: PathLike = Path("build")  # Output build files
+        self.src_dir: PathLike = Path("src")  # C/C++/asm source files
+        self.tools_dir: PathLike = Path("tools")  # Python scripts
+        self.asm_dir: PathLike = Path(
+            "asm"
+        )  # Override incomplete objects (for modding)
 
         # Tooling
-        self.dtk_tag = None  # Git tag
-        self.build_dtk_path = None  # If None, download
-        self.compilers_tag = None  # 1
-        self.compilers_path = None  # If None, download
-        self.wibo_tag = None  # Git tag
-        self.wrapper = None  # If None, download wibo on Linux
-        self.sjiswrap_tag = None  # Git tag
-        self.sjiswrap_path = None  # If None, download
+        self.binutils_tag: Optional[str] = None  # Git tag
+        self.binutils_path: Optional[PathLike] = None  # If None, download
+        self.dtk_tag: Optional[str] = None  # Git tag
+        self.build_dtk_path: Optional[PathLike] = None  # If None, download
+        self.compilers_tag: Optional[str] = None  # 1
+        self.compilers_path: Optional[PathLike] = None  # If None, download
+        self.wibo_tag: Optional[str] = None  # Git tag
+        self.wrapper: Optional[PathLike] = None  # If None, download wibo on Linux
+        self.sjiswrap_tag: Optional[str] = None  # Git tag
+        self.sjiswrap_path: Optional[PathLike] = None  # If None, download
 
         # Project config
-        self.build_rels = True  # Build REL files
-        self.check_sha_path = None  # Path to version.sha1
-        self.config_path = None  # Path to config.yml
-        self.debug = False  # Build with debug info
-        self.generate_map = False  # Generate map file(s)
-        self.ldflags = None  # Linker flags
-        self.libs = None  # List of libraries
-        self.linker_version = None  # mwld version
-        self.version = None  # Version name
-        self.warn_missing_config = False  # Warn on missing unit configuration
-        self.warn_missing_source = False  # Warn on missing source file
-        self.rel_strip_partial = True  # Generate PLFs with -strip_partial
-        self.rel_empty_file = None  # Path to empty.c for generating empty RELs
+        self.build_rels: bool = True  # Build REL files
+        self.check_sha_path: Optional[PathLike] = None  # Path to version.sha1
+        self.config_path: Optional[PathLike] = None  # Path to config.yml
+        self.debug: bool = False  # Build with debug info
+        self.generate_map: bool = False  # Generate map file(s)
+        self.asflags: Optional[List[str]] = None  # Assembler flags
+        self.ldflags: Optional[List[str]] = None  # Linker flags
+        self.libs: Optional[List[Dict[str, Any]]] = None  # List of libraries
+        self.linker_version: Optional[str] = None  # mwld version
+        self.version: Optional[str] = None  # Version name
+        self.warn_missing_config: bool = False  # Warn on missing unit configuration
+        self.warn_missing_source: bool = False  # Warn on missing source file
+        self.rel_strip_partial: bool = True  # Generate PLFs with -strip_partial
+        self.rel_empty_file: Optional[PathLike] = (
+            None  # Path to empty.c for generating empty RELs
+        )
+        self.shift_jis = (
+            True  # Convert source files from UTF-8 to Shift JIS automatically
+        )
 
         # Progress output and progress.json config
-        self.progress_all = True  # Include combined "all" category
-        self.progress_modules = True  # Include combined "modules" category
-        self.progress_each_module = (
+        self.progress_all: bool = True  # Include combined "all" category
+        self.progress_modules: bool = True  # Include combined "modules" category
+        self.progress_each_module: bool = (
             True  # Include individual modules, disable for large numbers of modules
         )
 
-    def validate(self):
+        # Progress fancy printing
+        self.progress_use_fancy: bool = False
+        self.progress_code_fancy_frac: int = 0
+        self.progress_code_fancy_item: str = ""
+        self.progress_data_fancy_frac: int = 0
+        self.progress_data_fancy_item: str = ""
+
+    def validate(self) -> None:
         required_attrs = [
             "build_dir",
             "src_dir",
@@ -82,33 +123,18 @@ class ProjectConfig:
             if getattr(self, attr) is None:
                 sys.exit(f"ProjectConfig.{attr} missing")
 
-    def find_object(self, name):
-        for lib in self.libs:
+    def find_object(self, name: str) -> Optional[Tuple[Dict[str, Any], Object]]:
+        for lib in self.libs or {}:
             for obj in lib["objects"]:
                 if obj.name == name:
-                    return [lib, obj]
+                    return lib, obj
         return None
 
-    def out_path(self):
-        return self.build_dir / self.version
+    def out_path(self) -> Path:
+        return self.build_dir / str(self.version)
 
 
-class Object:
-    def __init__(self, completed, name, **options):
-        self.name = name
-        self.completed = completed
-        self.options = {
-            "add_to_all": True,
-            "cflags": None,
-            "extra_cflags": None,
-            "mw_version": None,
-            "shiftjis": True,
-            "source": name,
-        }
-        self.options.update(options)
-
-
-def is_windows():
+def is_windows() -> bool:
     return os.name == "nt"
 
 
@@ -118,36 +144,25 @@ CHAIN = "cmd /c " if is_windows() else ""
 EXE = ".exe" if is_windows() else ""
 
 
-# Replace forward slashes with backslashes on Windows
-def os_str(value):
-    return str(value).replace("/", os.sep)
-
-
-# Replace backslashes with forward slashes on Windows
-def unix_str(value):
-    return str(value).replace(os.sep, "/")
-
-
-# Stringify paths for ninja_syntax
-def path(value):
-    if value is None:
-        return None
-    elif isinstance(value, list):
-        return list(map(os_str, filter(lambda x: x is not None, value)))
+def make_flags_str(cflags: Union[str, List[str]]) -> str:
+    if isinstance(cflags, list):
+        return " ".join(cflags)
     else:
-        return [os_str(value)]
+        return cflags
 
 
 # Load decomp-toolkit generated config.json
-def load_build_config(config, build_config_path):
+def load_build_config(
+    config: ProjectConfig, build_config_path: Path
+) -> Optional[Dict[str, Any]]:
     if not build_config_path.is_file():
         return None
 
-    def versiontuple(v):
+    def versiontuple(v: str) -> Tuple[int, ...]:
         return tuple(map(int, (v.split("."))))
 
     f = open(build_config_path, "r", encoding="utf-8")
-    build_config = json.load(f)
+    build_config: Dict[str, Any] = json.load(f)
     config_version = build_config.get("version")
     if not config_version:
         # Invalid config.json
@@ -155,7 +170,7 @@ def load_build_config(config, build_config_path):
         os.remove(build_config_path)
         return None
 
-    dtk_version = config.dtk_tag[1:]  # Strip v
+    dtk_version = str(config.dtk_tag)[1:]  # Strip v
     if versiontuple(config_version) < versiontuple(dtk_version):
         # Outdated config.json
         f.close()
@@ -167,14 +182,16 @@ def load_build_config(config, build_config_path):
 
 
 # Generate build.ninja and objdiff.json
-def generate_build(config):
+def generate_build(config: ProjectConfig) -> None:
     build_config = load_build_config(config, config.out_path() / "config.json")
     generate_build_ninja(config, build_config)
     generate_objdiff_config(config, build_config)
 
 
 # Generate build.ninja
-def generate_build_ninja(config, build_config):
+def generate_build_ninja(
+    config: ProjectConfig, build_config: Optional[Dict[str, Any]]
+) -> None:
     config.validate()
 
     out = io.StringIO()
@@ -182,9 +199,9 @@ def generate_build_ninja(config, build_config):
     n.variable("ninja_required_version", "1.3")
     n.newline()
 
-    configure_script = os.path.relpath(os.path.abspath(sys.argv[0]))
-    python_lib = os.path.relpath(__file__)
-    python_lib_dir = os.path.dirname(python_lib)
+    configure_script = Path(os.path.relpath(os.path.abspath(sys.argv[0])))
+    python_lib = Path(os.path.relpath(__file__))
+    python_lib_dir = python_lib.parent
     n.comment("The arguments passed to configure.py, for rerunning it.")
     n.variable("configure_args", sys.argv[1:])
     n.variable("python", f'"{sys.executable}"')
@@ -194,7 +211,7 @@ def generate_build_ninja(config, build_config):
     # Variables
     ###
     n.comment("Variables")
-    ldflags = " ".join(config.ldflags)
+    ldflags = " ".join(config.ldflags or [])
     if config.generate_map:
         ldflags += " -mapunused"
     if config.debug:
@@ -209,6 +226,7 @@ def generate_build_ninja(config, build_config):
     n.comment("Tooling")
 
     build_path = config.out_path()
+    progress_path = build_path / "progress.json"
     build_tools_path = config.build_dir / "tools"
     download_tool = config.tools_dir / "download_tool.py"
     n.rule(
@@ -217,20 +235,29 @@ def generate_build_ninja(config, build_config):
         description="TOOL $out",
     )
 
+    decompctx = config.tools_dir / "decompctx.py"
+    n.rule(
+        name="decompctx",
+        command=f"$python {decompctx} $in -o $out -d $out.d",
+        description="CTX $in",
+        depfile="$out.d",
+        deps="gcc",
+    )
+
     if config.build_dtk_path:
         dtk = build_tools_path / "release" / f"dtk{EXE}"
         n.rule(
             name="cargo",
             command="cargo build --release --manifest-path $in --bin $bin --target-dir $target",
             description="CARGO $bin",
-            depfile=path(Path("$target") / "release" / "$bin.d"),
+            depfile=Path("$target") / "release" / "$bin.d",
             deps="gcc",
         )
         n.build(
-            outputs=path(dtk),
+            outputs=dtk,
             rule="cargo",
-            inputs=path(config.build_dtk_path / "Cargo.toml"),
-            implicit=path(config.build_dtk_path / "Cargo.lock"),
+            inputs=config.build_dtk_path / "Cargo.toml",
+            implicit=config.build_dtk_path / "Cargo.lock",
             variables={
                 "bin": "dtk",
                 "target": build_tools_path,
@@ -239,9 +266,9 @@ def generate_build_ninja(config, build_config):
     elif config.dtk_tag:
         dtk = build_tools_path / f"dtk{EXE}"
         n.build(
-            outputs=path(dtk),
+            outputs=dtk,
             rule="download_tool",
-            implicit=path(download_tool),
+            implicit=download_tool,
             variables={
                 "tool": "dtk",
                 "tag": config.dtk_tag,
@@ -255,9 +282,9 @@ def generate_build_ninja(config, build_config):
     elif config.sjiswrap_tag:
         sjiswrap = build_tools_path / "sjiswrap.exe"
         n.build(
-            outputs=path(sjiswrap),
+            outputs=sjiswrap,
             rule="download_tool",
-            implicit=path(download_tool),
+            implicit=download_tool,
             variables={
                 "tool": "sjiswrap",
                 "tag": config.sjiswrap_tag,
@@ -268,7 +295,7 @@ def generate_build_ninja(config, build_config):
 
     # Only add an implicit dependency on wibo if we download it
     wrapper = config.wrapper
-    wrapper_implicit = None
+    wrapper_implicit: Optional[Path] = None
     if (
         config.wibo_tag is not None
         and sys.platform == "linux"
@@ -278,33 +305,53 @@ def generate_build_ninja(config, build_config):
         wrapper = build_tools_path / "wibo"
         wrapper_implicit = wrapper
         n.build(
-            outputs=path(wrapper),
+            outputs=wrapper,
             rule="download_tool",
-            implicit=path(download_tool),
+            implicit=download_tool,
             variables={
                 "tool": "wibo",
                 "tag": config.wibo_tag,
             },
         )
     if not is_windows() and wrapper is None:
-        wrapper = "wine"
+        wrapper = Path("wine")
     wrapper_cmd = f"{wrapper} " if wrapper else ""
 
-    compilers_implicit = None
+    compilers_implicit: Optional[Path] = None
     if config.compilers_path:
         compilers = config.compilers_path
     elif config.compilers_tag:
         compilers = config.build_dir / "compilers"
         compilers_implicit = compilers
         n.build(
-            outputs=path(compilers),
+            outputs=compilers,
             rule="download_tool",
-            implicit=path(download_tool),
+            implicit=download_tool,
             variables={
                 "tool": "compilers",
                 "tag": config.compilers_tag,
             },
         )
+    else:
+        sys.exit("ProjectConfig.compilers_tag missing")
+
+    binutils_implicit = None
+    if config.binutils_path:
+        binutils = config.binutils_path
+    elif config.binutils_tag:
+        binutils = config.build_dir / "binutils"
+        binutils_implicit = binutils
+        n.build(
+            outputs=binutils,
+            rule="download_tool",
+            implicit=download_tool,
+            variables={
+                "tool": "binutils",
+                "tag": config.binutils_tag,
+            },
+        )
+    else:
+        sys.exit("ProjectConfig.binutils_tag missing")
 
     n.newline()
 
@@ -316,16 +363,24 @@ def generate_build_ninja(config, build_config):
     # MWCC
     mwcc = compiler_path / "mwcceppc.exe"
     mwcc_cmd = f"{wrapper_cmd}{mwcc} $cflags -MMD -c $in -o $basedir"
-    mwcc_implicit = [compilers_implicit or mwcc, wrapper_implicit]
+    mwcc_implicit: List[Optional[Path]] = [compilers_implicit or mwcc, wrapper_implicit]
 
     # MWCC with UTF-8 to Shift JIS wrapper
     mwcc_sjis_cmd = f"{wrapper_cmd}{sjiswrap} {mwcc} $cflags -MMD -c $in -o $basedir"
-    mwcc_sjis_implicit = [*mwcc_implicit, sjiswrap]
+    mwcc_sjis_implicit: List[Optional[Path]] = [*mwcc_implicit, sjiswrap]
 
     # MWLD
     mwld = compiler_path / "mwldeppc.exe"
     mwld_cmd = f"{wrapper_cmd}{mwld} $ldflags -o $out @$out.rsp"
-    mwld_implicit = [compilers_implicit or mwld, wrapper_implicit]
+    mwld_implicit: List[Optional[Path]] = [compilers_implicit or mwld, wrapper_implicit]
+
+    # GNU as
+    gnu_as = binutils / f"powerpc-eabi-as{EXE}"
+    gnu_as_cmd = (
+        f"{CHAIN}{gnu_as} $asflags -o $out $in -MD $out.d"
+        + f" && {dtk} elf fixup $out $out"
+    )
+    gnu_as_implicit = [binutils_implicit or gnu_as, dtk]
 
     if os.name != "nt":
         transform_dep = config.tools_dir / "transform_dep.py"
@@ -372,6 +427,16 @@ def generate_build_ninja(config, build_config):
     )
     n.newline()
 
+    n.comment("Assemble asm")
+    n.rule(
+        name="as",
+        command=gnu_as_cmd,
+        description="AS $out",
+        depfile="$out.d",
+        deps="gcc",
+    )
+    n.newline()
+
     n.comment("Host build")
     n.variable("host_cflags", "-I include -Wno-trigraphs")
     n.variable(
@@ -394,37 +459,38 @@ def generate_build_ninja(config, build_config):
     # Source files
     ###
     n.comment("Source files")
+    build_asm_path = build_path / "mod"
     build_src_path = build_path / "src"
     build_host_path = build_path / "host"
     build_config_path = build_path / "config.json"
 
-    def map_path(path):
+    def map_path(path: Path) -> Path:
         return path.parent / (path.name + ".MAP")
 
     class LinkStep:
-        def __init__(self, config):
-            self.name = config["name"]
-            self.module_id = config["module_id"]
-            self.ldscript = config["ldscript"]
+        def __init__(self, config: Dict[str, Any]) -> None:
+            self.name: str = config["name"]
+            self.module_id: int = config["module_id"]
+            self.ldscript: Optional[Path] = config["ldscript"]
             self.entry = config["entry"]
-            self.inputs = []
+            self.inputs: List[str] = []
 
-        def add(self, obj):
-            self.inputs.append(obj)
+        def add(self, obj: os.PathLike) -> None:
+            self.inputs.append(str(obj))
 
-        def output(self):
+        def output(self) -> Path:
             if self.module_id == 0:
                 return build_path / f"{self.name}.dol"
             else:
                 return build_path / self.name / f"{self.name}.rel"
 
-        def partial_output(self):
+        def partial_output(self) -> Path:
             if self.module_id == 0:
                 return build_path / f"{self.name}.elf"
             else:
                 return build_path / self.name / f"{self.name}.plf"
 
-        def write(self, n):
+        def write(self, n: ninja_syntax.Writer) -> None:
             n.comment(f"Link {self.name}")
             if self.module_id == 0:
                 elf_path = build_path / f"{self.name}.elf"
@@ -436,23 +502,23 @@ def generate_build_ninja(config, build_config):
                 else:
                     elf_map = None
                 n.build(
-                    outputs=path(elf_path),
+                    outputs=elf_path,
                     rule="link",
-                    inputs=path(self.inputs),
-                    implicit=path([self.ldscript, *mwld_implicit]),
-                    implicit_outputs=path(elf_map),
+                    inputs=self.inputs,
+                    implicit=[self.ldscript, *mwld_implicit],
+                    implicit_outputs=elf_map,
                     variables={"ldflags": elf_ldflags},
                 )
                 n.build(
-                    outputs=path(dol_path),
+                    outputs=dol_path,
                     rule="elf2dol",
-                    inputs=path(elf_path),
-                    implicit=path(dtk),
+                    inputs=elf_path,
+                    implicit=dtk,
                 )
             else:
                 preplf_path = build_path / self.name / f"{self.name}.preplf"
                 plf_path = build_path / self.name / f"{self.name}.plf"
-                preplf_ldflags = f"$ldflags -sdata 0 -sdata2 0 -r"
+                preplf_ldflags = "$ldflags -sdata 0 -sdata2 0 -r"
                 plf_ldflags = f"$ldflags -sdata 0 -sdata2 0 -r1 -lcf {self.ldscript}"
                 if self.entry:
                     plf_ldflags += f" -m {self.entry}"
@@ -468,37 +534,133 @@ def generate_build_ninja(config, build_config):
                     preplf_map = None
                     plf_map = None
                 n.build(
-                    outputs=path(preplf_path),
+                    outputs=preplf_path,
                     rule="link",
-                    inputs=path(self.inputs),
-                    implicit=path(mwld_implicit),
-                    implicit_outputs=path(preplf_map),
+                    inputs=self.inputs,
+                    implicit=mwld_implicit,
+                    implicit_outputs=preplf_map,
                     variables={"ldflags": preplf_ldflags},
                 )
                 n.build(
-                    outputs=path(plf_path),
+                    outputs=plf_path,
                     rule="link",
-                    inputs=path(self.inputs),
-                    implicit=path([self.ldscript, preplf_path, *mwld_implicit]),
-                    implicit_outputs=path(plf_map),
+                    inputs=self.inputs,
+                    implicit=[self.ldscript, preplf_path, *mwld_implicit],
+                    implicit_outputs=plf_map,
                     variables={"ldflags": plf_ldflags},
                 )
             n.newline()
 
     if build_config:
-        link_steps = []
-        used_compiler_versions = set()
-        source_inputs = []
-        host_source_inputs = []
-        source_added = set()
+        link_steps: List[LinkStep] = []
+        used_compiler_versions: Set[str] = set()
+        source_inputs: List[Path] = []
+        host_source_inputs: List[Path] = []
+        source_added: Set[Path] = set()
 
-        def make_cflags_str(cflags):
-            if isinstance(cflags, list):
-                return " ".join(cflags)
-            else:
-                return cflags
+        def c_build(
+            obj: Object, options: Dict[str, Any], lib_name: str, src_path: Path
+        ) -> Optional[Path]:
 
-        def add_unit(build_obj, link_step):
+            cflags_str = make_flags_str(options["cflags"])
+            if options["extra_cflags"] is not None:
+                extra_cflags_str = make_flags_str(options["extra_cflags"])
+                cflags_str += " " + extra_cflags_str
+            used_compiler_versions.add(options["mw_version"])
+
+            src_obj_path = build_src_path / f"{obj.base_name}.o"
+            src_base_path = build_src_path / obj.base_name
+
+            # Avoid creating duplicate build rules
+            if src_obj_path in source_added:
+                return src_obj_path
+            source_added.add(src_obj_path)
+
+            shift_jis = options["shift_jis"]
+            if shift_jis is None:
+                shift_jis = config.shift_jis
+
+            # Add MWCC build rule
+            n.comment(f"{obj.name}: {lib_name} (linked {obj.completed})")
+            n.build(
+                outputs=src_obj_path,
+                rule="mwcc_sjis" if shift_jis else "mwcc",
+                inputs=src_path,
+                variables={
+                    "mw_version": Path(options["mw_version"]),
+                    "cflags": cflags_str,
+                    "basedir": os.path.dirname(src_base_path),
+                    "basefile": src_base_path,
+                },
+                implicit=mwcc_sjis_implicit if shift_jis else mwcc_implicit,
+            )
+
+            # Add ctx build rule
+            ctx_path = build_src_path / f"{obj.base_name}.ctx"
+            n.build(
+                outputs=ctx_path,
+                rule="decompctx",
+                inputs=src_path,
+                implicit=decompctx,
+            )
+
+            # Add host build rule
+            if options.get("host", False):
+                host_obj_path = build_host_path / f"{obj.base_name}.o"
+                host_base_path = build_host_path / obj.base_name
+                n.build(
+                    outputs=host_obj_path,
+                    rule="host_cc" if src_path.suffix == ".c" else "host_cpp",
+                    inputs=src_path,
+                    variables={
+                        "basedir": os.path.dirname(host_base_path),
+                        "basefile": host_base_path,
+                    },
+                )
+                if options["add_to_all"]:
+                    host_source_inputs.append(host_obj_path)
+            n.newline()
+
+            if options["add_to_all"]:
+                source_inputs.append(src_obj_path)
+
+            return src_obj_path
+
+        def asm_build(
+            obj: Object, options: Dict[str, Any], lib_name: str, src_path: Path
+        ) -> Optional[Path]:
+            asflags = options["asflags"] or config.asflags
+            if asflags is None:
+                sys.exit("ProjectConfig.asflags missing")
+            asflags_str = make_flags_str(asflags)
+            if options["extra_asflags"] is not None:
+                extra_asflags_str = make_flags_str(options["extra_asflags"])
+                asflags_str += " " + extra_asflags_str
+
+            asm_obj_path = build_asm_path / f"{obj.base_name}.o"
+
+            # Avoid creating duplicate build rules
+            if asm_obj_path in source_added:
+                return asm_obj_path
+            source_added.add(asm_obj_path)
+
+            # Add assembler build rule
+            n.comment(f"{obj.name}: {lib_name} (linked {obj.completed})")
+            n.build(
+                outputs=asm_obj_path,
+                rule="as",
+                inputs=src_path,
+                variables={"asflags": asflags_str},
+                implicit=gnu_as_implicit,
+            )
+            n.newline()
+
+            if options["add_to_all"]:
+                source_inputs.append(asm_obj_path)
+
+            return asm_obj_path
+
+        def add_unit(build_obj, link_step: LinkStep):
             obj_path, obj_name = build_obj["object"], build_obj["name"]
             result = config.find_object(obj_name)
             if not result:
@@ -509,70 +671,47 @@ def generate_build_ninja(config, build_config):
 
             lib, obj = result
             lib_name = lib["lib"]
-            src_dir = Path(lib.get("src_dir", config.src_dir))
 
-            options = obj.options
-            completed = obj.completed
+            # Use object options, then library options
+            options = lib.copy()
+            for key, value in obj.options.items():
+                if value is not None or key not in options:
+                    options[key] = value
 
-            unit_src_path = src_dir / options["source"]
-            if not unit_src_path.exists():
-                if config.warn_missing_source or completed:
+            unit_src_path = Path(lib.get("src_dir", config.src_dir)) / options["source"]
+            if config.asm_dir is not None:
+                unit_asm_path = (
+                    Path(lib.get("asm_dir", config.asm_dir)) / options["source"]
+                ).with_suffix(".s")
+
+            link_built_obj = obj.completed
+            if unit_src_path.exists():
+                if unit_src_path.suffix in (".c", ".cp", ".cpp"):
+                    # Add MWCC & host build rules
+                    built_obj_path = c_build(obj, options, lib_name, unit_src_path)
+                elif unit_src_path.suffix == ".s":
+                    # Add assembler build rule
+                    built_obj_path = asm_build(obj, options, lib_name, unit_src_path)
+                else:
+                    sys.exit(f"Unknown source file type {unit_src_path}")
+            else:
+                if config.warn_missing_source or obj.completed:
                     print(f"Missing source file {unit_src_path}")
+                link_built_obj = False
+
+            # Assembly overrides
+            if unit_asm_path is not None and unit_asm_path.exists():
+                link_built_obj = True
+                built_obj_path = asm_build(obj, options, lib_name, unit_asm_path)
+
+            if link_built_obj and built_obj_path is not None:
+                # Use the source-built object
+                link_step.add(built_obj_path)
+            elif obj_path is not None:
+                # Use the original (extracted) object
                 link_step.add(obj_path)
-                return
-
-            mw_version = options["mw_version"] or lib["mw_version"]
-            cflags_str = make_cflags_str(options["cflags"] or lib["cflags"])
-            if options["extra_cflags"] is not None:
-                extra_cflags_str = make_cflags_str(options["extra_cflags"])
-                cflags_str += " " + extra_cflags_str
-            used_compiler_versions.add(mw_version)
-
-            base_object = Path(obj.name).with_suffix("")
-            src_obj_path = build_src_path / f"{base_object}.o"
-            src_base_path = build_src_path / base_object
-
-            if src_obj_path not in source_added:
-                source_added.add(src_obj_path)
-
-                n.comment(f"{obj_name}: {lib_name} (linked {completed})")
-                n.build(
-                    outputs=path(src_obj_path),
-                    rule="mwcc_sjis" if options["shiftjis"] else "mwcc",
-                    inputs=path(unit_src_path),
-                    variables={
-                        "mw_version": path(Path(mw_version)),
-                        "cflags": cflags_str,
-                        "basedir": os.path.dirname(src_base_path),
-                        "basefile": path(src_base_path),
-                    },
-                    implicit=path(
-                        mwcc_sjis_implicit if options["shiftjis"] else mwcc_implicit
-                    ),
-                )
-
-                if lib["host"]:
-                    host_obj_path = build_host_path / f"{base_object}.o"
-                    host_base_path = build_host_path / base_object
-                    n.build(
-                        outputs=path(host_obj_path),
-                        rule="host_cc" if unit_src_path.suffix == ".c" else "host_cpp",
-                        inputs=path(unit_src_path),
-                        variables={
-                            "basedir": os.path.dirname(host_base_path),
-                            "basefile": path(host_base_path),
-                        },
-                    )
-                    if options["add_to_all"]:
-                        host_source_inputs.append(host_obj_path)
-                n.newline()
-
-                if options["add_to_all"]:
-                    source_inputs.append(src_obj_path)
-
-            if completed:
-                obj_path = src_obj_path
-            link_step.add(obj_path)
+            else:
+                sys.exit(f"Missing object for {obj_name}: {unit_src_path} {lib} {obj}")
 
         # Add DOL link step
         link_step = LinkStep(build_config)
@@ -608,7 +747,7 @@ def generate_build_ninja(config, build_config):
                 sys.exit(f"Compiler {mw_path} does not exist")
 
         # Check if linker exists
-        mw_path = compilers / config.linker_version / "mwldeppc.exe"
+        mw_path = compilers / str(config.linker_version) / "mwldeppc.exe"
         if config.compilers_path and not os.path.exists(mw_path):
             sys.exit(f"Linker {mw_path} does not exist")
 
@@ -648,7 +787,7 @@ def generate_build_ninja(config, build_config):
             rels_to_generate = list(
                 filter(
                     lambda step: step.module_id != 0
-                    and not step.name in generated_rels,
+                    and step.name not in generated_rels,
                     link_steps_local,
                 )
             )
@@ -669,15 +808,13 @@ def generate_build_ninja(config, build_config):
             )
             rel_names_arg = " ".join(map(lambda name: f"-n {name}", rel_names))
             n.build(
-                outputs=path(rel_outputs),
+                outputs=rel_outputs,
                 rule="makerel",
-                inputs=path(
-                    list(map(lambda step: step.partial_output(), link_steps_local))
-                ),
-                implicit=path([dtk, config.config_path]),
+                inputs=list(map(lambda step: step.partial_output(), link_steps_local)),
+                implicit=[dtk, config.config_path],
                 variables={
-                    "config": path(config.config_path),
-                    "rspfile": path(config.out_path() / f"rel{idx}.rsp"),
+                    "config": config.config_path,
+                    "rspfile": config.out_path() / f"rel{idx}.rsp",
                     "names": rel_names_arg,
                 },
             )
@@ -690,7 +827,7 @@ def generate_build_ninja(config, build_config):
         n.build(
             outputs="all_source",
             rule="phony",
-            inputs=path(source_inputs),
+            inputs=source_inputs,
         )
         n.newline()
 
@@ -701,7 +838,7 @@ def generate_build_ninja(config, build_config):
         n.build(
             outputs="all_source_host",
             rule="phony",
-            inputs=path(host_source_inputs),
+            inputs=host_source_inputs,
         )
         n.newline()
 
@@ -717,10 +854,10 @@ def generate_build_ninja(config, build_config):
             description="CHECK $in",
         )
         n.build(
-            outputs=path(ok_path),
+            outputs=ok_path,
             rule="check",
-            inputs=path(config.check_sha_path),
-            implicit=path([dtk, *map(lambda step: step.output(), link_steps)]),
+            inputs=config.check_sha_path,
+            implicit=[dtk, *map(lambda step: step.output(), link_steps)],
         )
         n.newline()
 
@@ -728,16 +865,15 @@ def generate_build_ninja(config, build_config):
         # Calculate progress
         ###
         n.comment("Calculate progress")
-        progress_path = build_path / "progress.json"
         n.rule(
             name="progress",
             command=f"$python {configure_script} $configure_args progress",
             description="PROGRESS",
         )
         n.build(
-            outputs=path(progress_path),
+            outputs=progress_path,
             rule="progress",
-            implicit=path([ok_path, configure_script, python_lib, config.config_path]),
+            implicit=[ok_path, configure_script, python_lib, config.config_path],
         )
 
         ###
@@ -753,7 +889,7 @@ def generate_build_ninja(config, build_config):
             description=f"DIFF {dol_elf_path}",
         )
         n.build(
-            inputs=path([config.config_path, dol_elf_path]),
+            inputs=[config.config_path, dol_elf_path],
             outputs="dol_diff",
             rule="dol_diff",
         )
@@ -771,10 +907,10 @@ def generate_build_ninja(config, build_config):
             description=f"APPLY {dol_elf_path}",
         )
         n.build(
-            inputs=path([config.config_path, dol_elf_path]),
+            inputs=[config.config_path, dol_elf_path],
             outputs="dol_apply",
             rule="dol_apply",
-            implicit=path([ok_path]),
+            implicit=[ok_path],
         )
         n.build(
             outputs="apply",
@@ -795,11 +931,11 @@ def generate_build_ninja(config, build_config):
         deps="gcc",
     )
     n.build(
-        inputs=path(config.config_path),
-        outputs=path(build_config_path),
+        inputs=config.config_path,
+        outputs=build_config_path,
         rule="split",
-        implicit=path(dtk),
-        variables={"out_dir": path(build_path)},
+        implicit=dtk,
+        variables={"out_dir": build_path},
     )
     n.newline()
 
@@ -816,14 +952,12 @@ def generate_build_ninja(config, build_config):
     n.build(
         outputs="build.ninja",
         rule="configure",
-        implicit=path(
-            [
-                build_config_path,
-                configure_script,
-                python_lib,
-                Path(python_lib_dir) / "ninja_syntax.py",
-            ]
-        ),
+        implicit=[
+            build_config_path,
+            configure_script,
+            python_lib,
+            python_lib_dir / "ninja_syntax.py",
+        ],
     )
     n.newline()
 
@@ -832,9 +966,9 @@ def generate_build_ninja(config, build_config):
     ###
     n.comment("Default rule")
     if build_config:
-        n.default(path(progress_path))
+        n.default(progress_path)
     else:
-        n.default(path(build_config_path))
+        n.default(build_config_path)
 
     # Write build.ninja
     with open("build.ninja", "w", encoding="utf-8") as f:
@@ -843,12 +977,14 @@ def generate_build_ninja(config, build_config):
 
 
 # Generate objdiff.json
-def generate_objdiff_config(config, build_config):
+def generate_objdiff_config(
+    config: ProjectConfig, build_config: Optional[Dict[str, Any]]
+) -> None:
     if not build_config:
         return
 
-    objdiff_config = {
-        "min_version": "0.4.3",
+    objdiff_config: Dict[str, Any] = {
+        "min_version": "1.0.0",
         "custom_make": "ninja",
         "build_target": False,
         "watch_patterns": [
@@ -866,18 +1002,50 @@ def generate_objdiff_config(config, build_config):
         "units": [],
     }
 
+    # decomp.me compiler name mapping
+    # Commented out versions have not been added to decomp.me yet
+    COMPILER_MAP = {
+        "GC/1.0": "mwcc_233_144",
+        "GC/1.1": "mwcc_233_159",
+        "GC/1.2.5": "mwcc_233_163",
+        "GC/1.2.5e": "mwcc_233_163e",
+        "GC/1.2.5n": "mwcc_233_163n",
+        "GC/1.3.2": "mwcc_242_81",
+        "GC/1.3.2r": "mwcc_242_81r",
+        "GC/2.0": "mwcc_247_92",
+        "GC/2.5": "mwcc_247_105",
+        "GC/2.6": "mwcc_247_107",
+        "GC/2.7": "mwcc_247_108",
+        "GC/3.0": "mwcc_41_60831",
+        # "GC/3.0a3": "mwcc_41_51213",
+        "GC/3.0a3.2": "mwcc_41_60126",
+        # "GC/3.0a3.3": "mwcc_41_60209",
+        # "GC/3.0a3.4": "mwcc_42_60308",
+        # "GC/3.0a5": "mwcc_42_60422",
+        "GC/3.0a5.2": "mwcc_41_60831",
+        "Wii/0x4201_127": "mwcc_42_142",
+        # "Wii/1.0": "mwcc_43_145",
+        # "Wii/1.0RC1": "mwcc_42_140",
+        "Wii/1.0a": "mwcc_42_142",
+        "Wii/1.1": "mwcc_43_151",
+        "Wii/1.3": "mwcc_43_172",
+        # "Wii/1.5": "mwcc_43_188",
+        "Wii/1.6": "mwcc_43_202",
+        "Wii/1.7": "mwcc_43_213",
+    }
+
     build_path = config.out_path()
 
-    def add_unit(build_obj, module_name):
+    def add_unit(build_obj: Dict[str, Any], module_name: str) -> None:
         if build_obj["autogenerated"]:
             # Skip autogenerated objects
             return
 
         obj_path, obj_name = build_obj["object"], build_obj["name"]
         base_object = Path(obj_name).with_suffix("")
-        unit_config = {
-            "name": unix_str(Path(module_name) / base_object),
-            "target_path": unix_str(obj_path),
+        unit_config: Dict[str, Any] = {
+            "name": Path(module_name) / base_object,
+            "target_path": obj_path,
         }
 
         result = config.find_object(obj_name)
@@ -888,13 +1056,21 @@ def generate_objdiff_config(config, build_config):
         lib, obj = result
         src_dir = Path(lib.get("src_dir", config.src_dir))
 
-        unit_src_path = src_dir / obj.options["source"]
+        # Use object options, then library options
+        options = lib.copy()
+        for key, value in obj.options.items():
+            if value is not None or key not in options:
+                options[key] = value
+
+        unit_src_path = src_dir / str(options["source"])
+
         if not unit_src_path.exists():
             objdiff_config["units"].append(unit_config)
             return
 
-        cflags = obj.options["cflags"] or lib["cflags"]
-        src_obj_path = build_path / "src" / f"{base_object}.o"
+        cflags = options["cflags"]
+        src_obj_path = build_path / "src" / f"{obj.base_name}.o"
+        src_ctx_path = build_path / "src" / f"{obj.base_name}.ctx"
 
         reverse_fn_order = False
         if type(cflags) is list:
@@ -907,9 +1083,32 @@ def generate_objdiff_config(config, build_config):
                     elif value == "nodeferred":
                         reverse_fn_order = False
 
-        unit_config["base_path"] = unix_str(src_obj_path)
+            # Filter out include directories
+            def keep_flag(flag):
+                return not flag.startswith("-i ") and not flag.startswith("-I ")
+
+            cflags = list(filter(keep_flag, cflags))
+
+            # Add appropriate lang flag
+            if unit_src_path.suffix in (".cp", ".cpp"):
+                cflags.insert(0, "-lang=c++")
+            else:
+                cflags.insert(0, "-lang=c")
+
+        unit_config["base_path"] = src_obj_path
         unit_config["reverse_fn_order"] = reverse_fn_order
         unit_config["complete"] = obj.completed
+        compiler_version = COMPILER_MAP.get(options["mw_version"])
+        if compiler_version is None:
+            print(f"Missing scratch compiler mapping for {options['mw_version']}")
+        else:
+            unit_config["scratch"] = {
+                "platform": "gc_wii",
+                "compiler": compiler_version,
+                "c_flags": make_flags_str(cflags),
+                "ctx_path": src_ctx_path,
+                "build_ctx": True,
+            }
         objdiff_config["units"].append(unit_config)
 
     # Add DOL units
@@ -923,28 +1122,34 @@ def generate_objdiff_config(config, build_config):
 
     # Write objdiff.json
     with open("objdiff.json", "w", encoding="utf-8") as w:
-        json.dump(objdiff_config, w, indent=4)
+        from .ninja_syntax import serialize_path
+
+        json.dump(objdiff_config, w, indent=4, default=serialize_path)
 
 
 # Calculate, print and write progress to progress.json
-def calculate_progress(config):
+def calculate_progress(config: ProjectConfig) -> None:
     out_path = config.out_path()
     build_config = load_build_config(config, out_path / "config.json")
     if not build_config:
         return
 
     class ProgressUnit:
-        def __init__(self, name):
-            self.name = name
-            self.code_total = 0
-            self.code_progress = 0
-            self.data_total = 0
-            self.data_progress = 0
-            self.objects_progress = 0
-            self.objects_total = 0
-            self.objects = set()
+        def __init__(self, name: str) -> None:
+            self.name: str = name
+            self.code_total: int = 0
+            self.code_fancy_frac: int = config.progress_code_fancy_frac
+            self.code_fancy_item: str = config.progress_code_fancy_item
+            self.code_progress: int = 0
+            self.data_total: int = 0
+            self.data_fancy_frac: int = config.progress_data_fancy_frac
+            self.data_fancy_item: str = config.progress_data_fancy_item
+            self.data_progress: int = 0
+            self.objects_progress: int = 0
+            self.objects_total: int = 0
+            self.objects: Set[Object] = set()
 
-        def add(self, build_obj):
+        def add(self, build_obj: Dict[str, Any]) -> None:
             self.code_total += build_obj["code_size"]
             self.data_total += build_obj["data_size"]
 
@@ -971,10 +1176,10 @@ def calculate_progress(config):
             if include_object:
                 self.objects_progress += 1
 
-        def code_frac(self):
+        def code_frac(self) -> float:
             return self.code_progress / self.code_total
 
-        def data_frac(self):
+        def data_frac(self) -> float:
             return self.data_progress / self.data_total
 
     # Add DOL units
@@ -987,7 +1192,7 @@ def calculate_progress(config):
 
     # Add REL units
     rels_progress = ProgressUnit("Modules") if config.progress_modules else None
-    modules_progress = []
+    modules_progress: List[ProgressUnit] = []
     for module in build_config["modules"]:
         progress = ProgressUnit(module["name"])
         modules_progress.append(progress)
@@ -1001,7 +1206,10 @@ def calculate_progress(config):
     # Print human-readable progress
     print("Progress:")
 
-    def print_category(unit):
+    def print_category(unit: Optional[ProgressUnit]) -> None:
+        if unit is None:
+            return
+
         code_frac = unit.code_frac()
         data_frac = unit.data_frac()
         print(
@@ -1009,6 +1217,17 @@ def calculate_progress(config):
         )
         print(f"    Code: {unit.code_progress} / {unit.code_total} bytes")
         print(f"    Data: {unit.data_progress} / {unit.data_total} bytes")
+        if config.progress_use_fancy:
+            print(
+                "\nYou have {} out of {} {} and collected {} out of {} {}.".format(
+                    math.floor(code_frac * unit.code_fancy_frac),
+                    unit.code_fancy_frac,
+                    unit.code_fancy_item,
+                    math.floor(data_frac * unit.data_fancy_frac),
+                    unit.data_fancy_frac,
+                    unit.data_fancy_item,
+                )
+            )
 
     if all_progress:
         print_category(all_progress)
@@ -1021,9 +1240,9 @@ def calculate_progress(config):
                 print_category(progress)
 
     # Generate and write progress.json
-    progress_json = {}
+    progress_json: Dict[str, Any] = {}
 
-    def add_category(category, unit):
+    def add_category(category: str, unit: ProgressUnit) -> None:
         progress_json[category] = {
             "code": unit.code_progress,
             "code/total": unit.code_total,
diff --git a/tools/transform_dep.py b/tools/transform_dep.py
index 86bd2ecb..124de04b 100644
--- a/tools/transform_dep.py
+++ b/tools/transform_dep.py
@@ -25,7 +25,7 @@ def in_wsl() -> bool:
     return "microsoft-standard" in uname().release
 
 
-def import_d_file(in_file) -> str:
+def import_d_file(in_file: str) -> str:
     out_text = ""
 
     with open(in_file) as file:
@@ -60,7 +60,7 @@ def import_d_file(in_file) -> str:
     return out_text
 
 
-def main():
+def main() -> None:
     parser = argparse.ArgumentParser(
         description="""Transform a .d file from Wine paths to normal paths"""
     )
@@ -81,4 +81,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/tools/upload_progress.py b/tools/upload_progress.py
index 673bb3d5..dc61d156 100644
--- a/tools/upload_progress.py
+++ b/tools/upload_progress.py
@@ -51,7 +51,7 @@ if __name__ == "__main__":
     args = parser.parse_args()
     api_key = args.api_key or os.environ.get("PROGRESS_API_KEY")
     if not api_key:
-        raise "API key required"
+        raise KeyError("API key required")
     url = generate_url(args)
 
     entries = []
@@ -68,9 +68,12 @@ if __name__ == "__main__":
     print("Publishing entry to", url)
     json.dump(entries[0], sys.stdout, indent=4)
     print()
-    r = requests.post(url, json={
-        "api_key": api_key,
-        "entries": entries,
-    })
+    r = requests.post(
+        url,
+        json={
+            "api_key": api_key,
+            "entries": entries,
+        },
+    )
     r.raise_for_status()
-    print("Done!")
\ No newline at end of file
+    print("Done!")