From bc145658bdaeaeea0cdbd719e2756f09a2dbfb48 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sun, 27 May 2012 10:45:57 -0400
Subject: [PATCH] Warn if no Unicode functions implementation is found

---
 src/hb-unicode-private.hh |  1 +
 src/hb-warning.cc         | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/hb-unicode-private.hh b/src/hb-unicode-private.hh
index c06dfe5fd..519fa0ba8 100644
--- a/src/hb-unicode-private.hh
+++ b/src/hb-unicode-private.hh
@@ -97,6 +97,7 @@ extern HB_INTERNAL hb_unicode_funcs_t _hb_glib_unicode_funcs;
 extern HB_INTERNAL hb_unicode_funcs_t _hb_icu_unicode_funcs;
 #define _hb_unicode_funcs_default _hb_icu_unicode_funcs
 #else
+#define HB_UNICODE_FUNCS_NIL 1
 extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_nil;
 #define _hb_unicode_funcs_default _hb_unicode_funcs_nil
 #endif
diff --git a/src/hb-warning.cc b/src/hb-warning.cc
index 6b5585fff..c13731b86 100644
--- a/src/hb-warning.cc
+++ b/src/hb-warning.cc
@@ -51,3 +51,16 @@
 #warning "To suppress these warnings, define HB_NO_MT"
 #endif
 #endif
+
+
+#include "hb-unicode-private.hh"
+
+#if !defined(HB_NO_UNICODE_FUNCS) && defined(HB_UNICODE_FUNCS_NIL)
+#ifdef _MSC_VER
+#pragma message("Could not find any Unicode functions implementation, you have to provide your own")
+#pragma message("To suppress this warnings, define HB_NO_UNICODE_FUNCS")
+#else
+#warning "Could not find any Unicode functions implementation, you have to provide your own"
+#warning "To suppress this warning, define HB_NO_UNICODE_FUNCS"
+#endif
+#endif