Merge pull request #6620 from microsoft/seanmcm/cherryPick6619

cherry pick6619

Author: sean-mcmanus

Extension/CHANGELOG.md

@@ -7,6 +7,7 @@
 * Fix various task variables not getting resolved with `cppbuild` tasks. [#6538](https://github.com/microsoft/vscode-cpptools/issues/6538)
 * Fix warnings not appearing with `cppbuild` tasks. [#6556](https://github.com/microsoft/vscode-cpptools/issues/6556)
 * Fix endless CPU/memory usage if the cpptools process crashes. [#6603](https://github.com/microsoft/vscode-cpptools/issues/6603)
+* Fix the default `cwd` for `cppbuild` tasks. [#6618](https://github.com/microsoft/vscode-cpptools/issues/6618)
 
 ## Version 1.1.2: November 17, 2020
 ### Bug Fix

Extension/src/Debugger/configurationProvider.ts

@@ -178,10 +178,13 @@ class CppConfigurationProvider implements vscode.DebugConfigurationProvider {
             newConfig.preLaunchTask = task.name;
             newConfig.externalConsole = false;
             const exeName: string = path.join("${fileDirname}", "${fileBasenameNoExtension}");
-            newConfig.program = platform === "win32" ? exeName + ".exe" : exeName;
+            const isWindows: boolean = platform === 'win32';
+            newConfig.program = isWindows ? exeName + ".exe" : exeName;
             // Add the "detail" property to show the compiler path in QuickPickItem.
             // This property will be removed before writing the DebugConfiguration in launch.json.
             newConfig.detail = task.detail ? task.detail : definition.command;
+            const isCl: boolean = compilerName === "cl.exe";
+            newConfig.cwd = isWindows && !isCl && !process.env.PATH?.includes(compilerPath) ? path.dirname(compilerPath) : "${workspaceFolder}";
 
             return new Promise<vscode.DebugConfiguration>(resolve => {
                 if (platform === "darwin") {
@@ -201,7 +204,7 @@ class CppConfigurationProvider implements vscode.DebugConfigurationProvider {
                         debuggerName = "gdb";
                     }
 
-                    if (platform === "win32") {
+                    if (isWindows) {
                         debuggerName += ".exe";
                     }
 

Extension/src/LanguageServer/cppBuildTaskProvider.ts

@@ -167,7 +167,7 @@ export class CppBuildTaskProvider implements TaskProvider {
             if (compilerArgs && compilerArgs.length > 0) {
                 args = args.concat(compilerArgs);
             }
-            const cwd: string = isCl ? "${workspaceFolder}" : path.dirname(compilerPath);
+            const cwd: string = isWindows && !isCl && !process.env.PATH?.includes(compilerPath) ? path.dirname(compilerPath) : "${workspaceFolder}";
             const options: cp.ExecOptions | undefined = { cwd: cwd };
             definition = {
                 type: CppBuildTaskProvider.CppBuildScriptType,