make sure XDG_RUNTIME_DIR exists

CHANGELOG.md

@@ -1,5 +1,10 @@
 # What's New?
 
+## 0.9
+Bug Fixes:
+
+- Fix an issue with XDG_RUNTIME_DIR where we tried to reference the directory, but it didn't exist. [#553](https://github.com/microsoft/vscode-makefile-tools/pull/555)
+
 ## 0.8
 Bug Fixes:
 - Fix a bug where the first argument for pre/post-configure args didn't have the proper spacing in front of it [PR #530](https://github.com/microsoft/vscode-makefile-tools/pull/530)

src/util.ts

@@ -95,7 +95,14 @@ export function tmpDir(): string {
     if (process.platform === 'win32') {
         return process.env['TEMP'] || "";
     } else {
-        return process.env['XDG_RUNTIME_DIR'] || '/tmp';
+        const xdg = process.env['XDG_RUNTIME_DIR'];
+        if (xdg) {
+            if (!fs.existsSync(xdg)) {
+                fs.mkdirSync(xdg);
+            }
+            return xdg;
+        }
+        return '/tmp';
     }
 }