diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -219,7 +219,11 @@
   SystemConfigDir = CLANG_CONFIG_FILE_SYSTEM_DIR;
 #endif
 #if defined(CLANG_CONFIG_FILE_USER_DIR)
-  UserConfigDir = CLANG_CONFIG_FILE_USER_DIR;
+  {
+    SmallString<128> P;
+    llvm::sys::fs::expand_tilde(CLANG_CONFIG_FILE_USER_DIR, P);
+    UserConfigDir = static_cast<std::string>(P);
+  }
 #endif
 
   // Compute the path to the resource directory.
@@ -979,8 +983,8 @@
     }
     if (CLOptions->hasArg(options::OPT_config_user_dir_EQ)) {
       SmallString<128> CfgDir;
-      CfgDir.append(
-          CLOptions->getLastArgValue(options::OPT_config_user_dir_EQ));
+      llvm::sys::fs::expand_tilde(
+          CLOptions->getLastArgValue(options::OPT_config_user_dir_EQ), CfgDir);
       if (!CfgDir.empty()) {
         if (llvm::sys::fs::make_absolute(CfgDir).value() != 0)
           UserConfigDir.clear();