Better extern handling

Former-commit-id: 10cb22b560dd2da972249fb983cb202317b3a27a

configure.py

@@ -240,7 +240,6 @@ def DolphinLib(lib_name, objects):
         "lib": lib_name + "D" if config.debug else "",
         "mw_version": "GC/1.2.5n",
         "cflags": cflags_base,
-        "extern": False,
         "host": False,
         "objects": objects,
     }
@@ -251,7 +250,6 @@ def RetroLib(lib_name, objects):
         "lib": lib_name + "CW" + "D" if config.debug else "",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_retro,
-        "extern": False,
         "host": False,
         "objects": objects,
     }
@@ -262,8 +260,7 @@ def MusyX(objects, mw_version="GC/1.3.2", debug=False, major=2, minor=0, patch=0
     return {
         "lib": "musyx",
         "mw_version": mw_version,
-        "extern": True,
-        "extern_source": "extern/musyx/src",
+        "extern": "extern/musyx/src",
         "host": False,
         "cflags": [
             *cflags,
@@ -917,7 +914,6 @@ config.libs = [
         "lib": "zlib",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_runtime,
-        "extern": False,
         "host": False,
         "objects": [
             Object(Matching, "Kyoto/zlib/adler32.c"),
@@ -1115,7 +1111,6 @@ config.libs = [
         "lib": "MSL_C.PPCEABI.bare.H",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_runtime,
-        "extern": False,
         "host": False,
         "objects": [
             Object(Matching, "Runtime/__mem.c"),
@@ -1226,28 +1221,6 @@ config.libs = [
             Object(Matching, "musyx/runtime/profile.c"),
         ],
     ),
-    {
-        "lib": "txwin",
-        "mw_version": "GC/1.2.5n",
-        "cflags": [
-            "-Cpp_exceptions off",
-            "-proc gecko",
-            "-fp hard",
-            "-nodefaults",
-            "-nosyspath",
-            "-i include",
-            "-i libc",
-            "-g",
-            "-sym on",
-            "-D_DEBUG=1",
-            "-enum int",
-        ],
-        "extern": True,
-        "host": False,
-        "objects": [
-            Object(NonMatching, "musyx/txwin/txwin.c"),
-        ],
-    },
     DolphinLib(
         "Dummy",
         [

tools/project.py

@@ -511,8 +511,13 @@ def generate_build_ninja(config, build_config):
             options = obj.options
             completed = obj.completed
 
-            if "extern" in lib.keys() and lib["extern"]:
-                unit_src_path = Path(lib["extern_source"]) / options["source"]
+            # For extern sources we need to use the specified source directory
+            if "extern" in lib.keys():
+                lib_path = Path(lib["extern"])
+                if not lib_path.exists():
+                    sys.exit(f"Specified extern path '{lib_path}' not found")
+            
+                unit_src_path = lib_path / options["source"]
             else:
                 unit_src_path = config.src_dir / options["source"]
 
@@ -832,11 +837,18 @@ def generate_objdiff_config(config, build_config):
             return
 
         lib, obj = result
-        if "extern" in lib.keys() and lib["extern"]:
-            unit_src_path = Path(lib["extern_source"]) / obj.options["source"]
+        lib_name = lib["lib"]
+
+        # For extern sources we need to use the specified source directory
+        if "extern" in lib.keys():
+            lib_path = Path(lib["extern"])
+            if not lib_path.exists():
+                sys.exit(f"Specified extern path '{lib_path}' not found")
+            
+            unit_src_path = Path(lib["extern"]) / obj.options["source"]
         else:
             unit_src_path = config.src_dir / obj.options["source"]
-        print(unit_src_path)
+
         if not unit_src_path.exists():
             objdiff_config["units"].append(unit_config)
             return