[C++] Fix shell_var.mk

1 files changed, 7 insertions, 0 deletions

diff --git a/symtab.h b/symtab.h
index 55e1ce3..907a6eb 100644
--- a/symtab.h
+++ b/symtab.h
@@ -28,6 +28,11 @@ class Symtab;
 
 class Symbol {
  public:
+  struct IsUninitialized {};
+  explicit Symbol(IsUninitialized)
+    : v_(-1) {
+  }
+
   const string& str() const {
     return (*g_symbols)[v_];
   }
@@ -67,6 +72,8 @@ template<> struct hash<Symbol> {
 };
 }
 
+extern Symbol kShellSym;
+
 void InitSymtab();
 void QuitSymtab();
 Symbol Intern(StringPiece s);