Add renaming of PDB files to avoid blocking them

platform/windows/os_windows.cpp

@@ -34,6 +34,7 @@
 #include "joypad_windows.h"
 #include "lang_table.h"
 #include "windows_terminal_logger.h"
+#include "windows_utils.h"
 
 #include "core/debugger/engine_debugger.h"
 #include "core/debugger/script_debugger.h"
@@ -269,6 +270,10 @@ void OS_Windows::finalize() {
 }
 
 void OS_Windows::finalize_core() {
+	while (!temp_libraries.is_empty()) {
+		_remove_temp_library(temp_libraries.last()->key);
+	}
+
 	FileAccessWindows::finalize();
 
 	timeEndPeriod(1);
@@ -354,7 +359,7 @@ void debug_dynamic_library_check_dependencies(const String &p_root_path, const S
 }
 #endif
 
-Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_handle, bool p_also_set_library_path, String *r_resolved_path) {
+Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_handle, bool p_also_set_library_path, String *r_resolved_path, bool p_generate_temp_files) {
 	String path = p_path.replace("/", "\\");
 
 	if (!FileAccess::exists(path)) {
@@ -364,6 +369,35 @@ Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_ha
 
 	ERR_FAIL_COND_V(!FileAccess::exists(path), ERR_FILE_NOT_FOUND);
 
+	// Here we want a copy to be loaded.
+	// This is so the original file isn't locked and can be updated by a compiler.
+	if (p_generate_temp_files) {
+		// Copy the file to the same directory as the original with a prefix in the name.
+		// This is so relative path to dependencies are satisfied.
+		String copy_path = path.get_base_dir().path_join("~" + path.get_file());
+
+		// If there's a left-over copy (possibly from a crash) then delete it first.
+		if (FileAccess::exists(copy_path)) {
+			DirAccess::remove_absolute(copy_path);
+		}
+
+		Error copy_err = DirAccess::copy_absolute(path, copy_path);
+		if (copy_err) {
+			ERR_PRINT("Error copying library: " + path);
+			return ERR_CANT_CREATE;
+		}
+
+		FileAccess::set_hidden_attribute(copy_path, true);
+
+		// Save the copied path so it can be deleted later.
+		path = copy_path;
+
+		Error pdb_err = WindowsUtils::copy_and_rename_pdb(path);
+		if (pdb_err != OK && pdb_err != ERR_SKIP) {
+			WARN_PRINT(vformat("Failed to rename the PDB file. The original PDB file for '%s' will be loaded.", path));
+		}
+	}
+
 	typedef DLL_DIRECTORY_COOKIE(WINAPI * PAddDllDirectory)(PCWSTR);
 	typedef BOOL(WINAPI * PRemoveDllDirectory)(DLL_DIRECTORY_COOKIE);
 
@@ -378,8 +412,12 @@ Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_ha
 	}
 
 	p_library_handle = (void *)LoadLibraryExW((LPCWSTR)(path.utf16().get_data()), nullptr, (p_also_set_library_path && has_dll_directory_api) ? LOAD_LIBRARY_SEARCH_DEFAULT_DIRS : 0);
-#ifdef DEBUG_ENABLED
 	if (!p_library_handle) {
+		if (p_generate_temp_files) {
+			DirAccess::remove_absolute(path);
+		}
+
+#ifdef DEBUG_ENABLED
 		DWORD err_code = GetLastError();
 
 		HashSet<String> checekd_libs;
@@ -397,8 +435,10 @@ Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_ha
 		} else {
 			ERR_FAIL_V_MSG(ERR_CANT_OPEN, vformat("Can't open dynamic library: %s. Error: %s.", p_path, format_error_message(err_code)));
 		}
+#endif
 	}
-#else
+
+#ifndef DEBUG_ENABLED
 	ERR_FAIL_NULL_V_MSG(p_library_handle, ERR_CANT_OPEN, vformat("Can't open dynamic library: %s. Error: %s.", p_path, format_error_message(GetLastError())));
 #endif
 
@@ -410,6 +450,10 @@ Error OS_Windows::open_dynamic_library(const String &p_path, void *&p_library_ha
 		*r_resolved_path = path;
 	}
 
+	if (p_generate_temp_files) {
+		temp_libraries[p_library_handle] = path;
+	}
+
 	return OK;
 }
 
@@ -417,9 +461,22 @@ Error OS_Windows::close_dynamic_library(void *p_library_handle) {
 	if (!FreeLibrary((HMODULE)p_library_handle)) {
 		return FAILED;
 	}
+
+	// Delete temporary copy of library if it exists.
+	_remove_temp_library(p_library_handle);
+
 	return OK;
 }
 
+void OS_Windows::_remove_temp_library(void *p_library_handle) {
+	if (temp_libraries.has(p_library_handle)) {
+		String path = temp_libraries[p_library_handle];
+		DirAccess::remove_absolute(path);
+		WindowsUtils::remove_temp_pdbs(path);
+		temp_libraries.erase(p_library_handle);
+	}
+}
+
 Error OS_Windows::get_dynamic_library_symbol_handle(void *p_library_handle, const String &p_name, void *&p_symbol_handle, bool p_optional) {
 	p_symbol_handle = (void *)GetProcAddress((HMODULE)p_library_handle, p_name.utf8().get_data());
 	if (!p_symbol_handle) {