workaround #47883

src/vs/platform/log/common/log.ts

@@ -300,6 +300,31 @@ export class NullLogService implements ILogService {
 	dispose(): void { }
 }
 
+export interface IOutputWriter {
+	trace(message: string): void;
+	debug(message: string): void;
+	info(message: string): void;
+	warn(message: string): void;
+	error(message: string): void;
+	critical(message: string): void;
+	setLevel(level: number): void;
+	clearFormatters(): void;
+	flush(): void;
+	drop(): void;
+}
+
+export class NullOutputWriter implements IOutputWriter {
+	trace(message: string): void { }
+	debug(message: string): void { }
+	info(message: string): void { }
+	warn(message: string): void { }
+	error(message: string): void { }
+	critical(message: string): void { }
+	setLevel(level: number): void { }
+	clearFormatters(): void { }
+	flush(): void { }
+	drop(): void { }
+}
 
 export function getLogLevel(environmentService: IEnvironmentService): LogLevel {
 	if (environmentService.verbose) {

src/vs/platform/log/node/spdlogService.ts

@@ -6,7 +6,7 @@
 'use strict';
 
 import * as path from 'path';
-import { ILogService, LogLevel, NullLogService, AbstractLogService } from 'vs/platform/log/common/log';
+import { ILogService, LogLevel, NullLogService, AbstractLogService, NullOutputWriter, IOutputWriter } from 'vs/platform/log/common/log';
 import * as spdlog from 'spdlog';
 
 export function createSpdLogService(processName: string, logLevel: LogLevel, logsFolder: string): ILogService {
@@ -25,6 +25,16 @@ export function createSpdLogService(processName: string, logLevel: LogLevel, log
 	return new NullLogService();
 }
 
+export function createSpdLogOutputWriter(name: string, filename: string, filesize: number, filecount: number): IOutputWriter {
+	// Do not crash if spdlog rotating logger cannot be loaded (workaround for https://github.com/Microsoft/vscode/issues/47883)
+	try {
+		return new spdlog.RotatingLogger(name, filename, filesize, filecount);
+	} catch (e) {
+		console.error(e);
+	}
+	return new NullOutputWriter();
+}
+
 class SpdLogService extends AbstractLogService implements ILogService {
 
 	_serviceBrand: any;

src/vs/workbench/parts/output/electron-browser/outputServices.ts

@@ -31,13 +31,13 @@ import { IFileService } from 'vs/platform/files/common/files';
 import { IPanel } from 'vs/workbench/common/panel';
 import { ResourceEditorInput } from 'vs/workbench/common/editor/resourceEditorInput';
 import { IEnvironmentService } from 'vs/platform/environment/common/environment';
-import { RotatingLogger } from 'spdlog';
 import { toLocalISOString } from 'vs/base/common/date';
 import { IWindowService } from 'vs/platform/windows/common/windows';
-import { ILogService } from 'vs/platform/log/common/log';
+import { ILogService, IOutputWriter } from 'vs/platform/log/common/log';
 import { Schemas } from 'vs/base/common/network';
 import { ILifecycleService } from 'vs/platform/lifecycle/common/lifecycle';
 import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
+import { createSpdLogOutputWriter } from 'vs/platform/log/node/spdlogService';
 
 const OUTPUT_ACTIVE_CHANNEL_KEY = 'output.activechannel';
 
@@ -201,7 +201,7 @@ abstract class AbstractFileOutputChannel extends Disposable {
  */
 class OutputChannelBackedByFile extends AbstractFileOutputChannel implements OutputChannel {
 
-	private outputWriter: RotatingLogger;
+	private outputWriter: IOutputWriter;
 	private appendedMessage = '';
 	private loadingFromFileInProgress: boolean = false;
 	private resettingDelayer: ThrottledDelayer<void>;
@@ -219,7 +219,7 @@ class OutputChannelBackedByFile extends AbstractFileOutputChannel implements Out
 		super({ ...outputChannelIdentifier, file: URI.file(paths.join(outputDir, `${outputChannelIdentifier.id}.log`)) }, modelUri, OUTPUT_MIME, fileService, modelService, modeService);
 
 		// Use one rotating file to check for main file reset
-		this.outputWriter = new RotatingLogger(this.id, this.file.fsPath, 1024 * 1024 * 30, 1);
+		this.outputWriter = createSpdLogOutputWriter(this.id, this.file.fsPath, 1024 * 1024 * 30, 1);
 		this.outputWriter.clearFormatters();
 		this.rotatingFilePath = `${outputChannelIdentifier.id}.1.log`;
 		this._register(watchOutputDirectory(paths.dirname(this.file.fsPath), logService, (eventType, file) => this.onFileChangedInOutputDirector(eventType, file)));