Add a method for auto-renaming the PDB

test/SConstruct

@@ -35,8 +35,13 @@ elif env["platform"] == "ios":
             source=sources,
         )
 else:
+    library_path = "project/bin/libgdexample{}{}".format(env["suffix"], env["SHLIBSUFFIX"])
+
+    if env.get("is_msvc", False) and env["debug_symbols"] and env["use_hot_reload"]:
+        env.MSVCTryRenamePDB(library_path)
+
     library = env.SharedLibrary(
-        "project/bin/libgdexample{}{}".format(env["suffix"], env["SHLIBSUFFIX"]),
+        library_path,
         source=sources,
     )
 

test/project/example.gdextension

@@ -1,7 +1,8 @@
 [configuration]
 
 entry_symbol = "example_library_init"
-compatibility_minimum = "4.1"
+compatibility_minimum = "4.2"
+reloadable = true
 
 [libraries]
 

tools/godotcpp.py

@@ -1,4 +1,5 @@
 import os, sys, platform
+import methods
 
 from SCons.Variables import EnumVariable, PathVariable, BoolVariable
 from SCons.Tool import Tool
@@ -316,6 +317,9 @@ def generate(env):
     env.Append(BUILDERS={"GodotCPPBindings": Builder(action=scons_generate_bindings, emitter=scons_emit_files)})
     env.AddMethod(_godot_cpp, "GodotCPP")
 
+    # Global methods
+    env.AddMethod(methods.msvc_try_rename_pdb, "MSVCTryRenamePDB")
+
 
 def _godot_cpp(env):
     extension_dir = normalize_path(env.get("gdextension_dir", env.Dir("gdextension").abspath), env)

tools/methods.py

@@ -0,0 +1,61 @@
+import os
+
+# Useful methods for custom scripts
+
+
+# A utility function for getting the name of an unblocked file
+def _get_unblocked_file_name(original_file_path, new_file_ext, max_files=256, keep_newest_one=True):
+    lib_dir = os.path.normpath(os.path.dirname(original_file_path))
+    lib_name = os.path.splitext(os.path.basename(original_file_path))[0]
+
+    # Collect all matching files
+    found_files = [
+        f
+        for f in os.listdir(lib_dir)
+        if os.path.isfile(os.path.join(lib_dir, f)) and f.startswith(lib_name) and f.endswith("." + new_file_ext)
+    ]
+    found_files = sorted(found_files, key=lambda x: os.path.getmtime(os.path.join(lib_dir, x)))
+
+    # Clean up the old files if possible, except for the newest one
+    if found_files:
+        if keep_newest_one:
+            found_files.pop()
+        for f in found_files:
+            try:
+                os.remove(os.path.join(lib_dir, f))
+            except:
+                pass
+
+    # Search for a unblocked file name
+    file_name = ""
+    for s in range(max_files):
+        file_name = "{}_{}.{}".format(os.path.join(lib_dir, lib_name), s, new_file_ext)
+        if not os.path.exists(file_name):
+            break
+        try:
+            with open(file_name, "a") as f:
+                pass
+        except IOError:
+            continue
+        break
+
+    return file_name
+
+
+# This is necessary to support debugging and Hot-Reload at the same time when building using MSVC
+def msvc_try_rename_pdb(env, full_lib_path):
+    if not env.get("is_msvc", False):
+        print("Renaming the PDB file will be ignored because of a compiler mismatch.")
+        return
+    if not env["debug_symbols"]:
+        print("Renaming the PDB file will be ignored because debug symbols generation is disabled.")
+        return
+    if not env["use_hot_reload"]:
+        print("Renaming the PDB file will be ignored because Hot-Reload is disabled.")
+        return
+
+    pdb_name = _get_unblocked_file_name(full_lib_path, "pdb")
+    print("New path to the PDB: " + pdb_name)
+
+    # Explicit assignment of the PDB path
+    env.Append(LINKFLAGS=["/PDB:" + pdb_name])