From 4cc467e2aab2c0a6ad17b128f03c41bef5782393 Mon Sep 17 00:00:00 2001
From: Dmitry Petrashko <dark@d-d.me>
Date: Tue, 6 Mar 2018 20:17:12 -0800
Subject: [PATCH] Fix lto build on clang by marking HolderBase::operator() as
 abstract (#12)

---
 subprocess.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/subprocess.hpp b/subprocess.hpp
index 0341474..41a1e3b 100755
--- a/subprocess.hpp
+++ b/subprocess.hpp
@@ -611,7 +611,7 @@ public:
 
 private:
   struct HolderBase {
-    virtual void operator()() const;
+    virtual void operator()() const = 0;
   };
   template <typename T>
   struct FuncHolder: HolderBase {