fix

src/download.ts

@@ -1,6 +1,7 @@
 import * as tc from '@actions/tool-cache'
 import * as core from '@actions/core'
 import * as httpm from '@actions/http-client'
+import * as exec from '@actions/exec'
 import { GitHubRelease } from './github-release'
 
 /**
@@ -39,12 +40,32 @@ export async function download(version: string): Promise<string> {
 
   core.info(`Extracting Clang archive...`)
 
-  const extractedPath = await tc.extractTar(
-    archivePath,
-    undefined,
-    '-x --strip-components=1'
+  let exit = await exec.exec('mkdir', ['-p', `/tmp/clang-${version}`])
+
+  if (exit !== 0) {
+    throw new Error(`Failed to create directory /tmp/clang-${version}`)
+  }
+
+  exit = await exec.exec('tar', [
+    '-x',
+    '--strip-components=1',
+    '--warning=no-unknown-keyword',
+    '--overwrite',
+    '-C',
+    `/tmp/clang-${version}`,
+    '-f',
+    archivePath
+  ])
+
+  if (exit !== 0) {
+    throw new Error(`Failed to extract clang`)
+  }
+
+  const cachedPath = await tc.cacheDir(
+    `/tmp/clang-${version}`,
+    'clang',
+    version
   )
-  const cachedPath = await tc.cacheDir(extractedPath, 'clang', version)
 
   return cachedPath
 }