From 660487c43fde76f3e64f1cb2e644500da92fe582 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20Rosenkr=C3=A4nzer?= <bero@lindev.ch>
Date: Fri, 9 Feb 2018 18:20:30 +0100
Subject: [PATCH] Fix build with Python 3.7
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Python 3.7 changes the return type of _PyUnicode_AsString()
from void* to const char* -- causing the build of boost-python
to fail.

Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
---
 src/converter/builtin_converters.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/converter/builtin_converters.cpp b/src/converter/builtin_converters.cpp
index 1c28af7fc..ee2d5b479 100644
--- a/libs/python/src/converter/builtin_converters.cpp
+++ b/libs/python/src/converter/builtin_converters.cpp
@@ -45,11 +45,16 @@ namespace
   {
       return PyString_Check(obj) ? PyString_AsString(obj) : 0;
   }
-#else
+#elif PY_VERSION_HEX < 0x03070000
   void* convert_to_cstring(PyObject* obj)
   {
       return PyUnicode_Check(obj) ? _PyUnicode_AsString(obj) : 0;
   }
+#else
+  void* convert_to_cstring(PyObject* obj)
+  {
+      return PyUnicode_Check(obj) ? const_cast<void*>(reinterpret_cast<const void*>(_PyUnicode_AsString(obj))) : 0;
+  }
 #endif
 
   // Given a target type and a SlotPolicy describing how to perform a