From bca83618cda7ee4f683b4685d10db9e1bef4983c Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 10 Jul 2018 12:58:13 +0200
Subject: [PATCH] Add fallback implementation for constexpr and alignof

---
 src/hb-private.hh | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/hb-private.hh b/src/hb-private.hh
index 5cec8e0b4..6893bfd35 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -84,6 +84,10 @@ extern "C" void  hb_free_impl(void *ptr);
 #define nullptr NULL
 #endif
 
+#ifndef constexpr
+#define constexpr const
+#endif
+
 // Static assertions
 #ifndef static_assert
 #define static_assert(e, msg) \
@@ -98,6 +102,20 @@ extern "C" void  hb_free_impl(void *ptr);
 #define thread_local
 #endif
 
+#ifndef alignof
+#define alignof(x) _hb_alignof<x>::value;
+template <typename T>
+struct _hb_alignof
+{
+  struct s
+  {
+    char c;
+    T t;
+  };
+  static constexpr unsigned int value = offsetof (s, t);
+};
+#endif // alignof
+
 #endif // __cplusplus < 201103L
 
 #if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)