derived from https://github.com/boostorg/log/commit/870284ed31792708a6139925d00a0aadf46bf09f.patch

boost-log_setup.patch

From 870284ed31792708a6139925d00a0aadf46bf09f Mon Sep 17 00:00:00 2001
From: Christopher Moore <[email protected]>
Date: Mon, 24 Aug 2015 14:29:02 -0400
Subject: [PATCH] Fixed missing symbols in libboost_log_setup (on mac/clang)

---
 include/boost/log/detail/setup_config.hpp | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/boost/log/detail/setup_config.hpp b/boost/log/detail/setup_config.hpp
index fec50fb..28c6671 100644
--- a/boost/log/detail/setup_config.hpp
+++ b/boost/log/detail/setup_config.hpp
@@ -30,11 +30,17 @@
 #        define BOOST_LOG_SETUP_DLL
 #   endif
 
-#   if defined(BOOST_HAS_DECLSPEC) && defined(BOOST_LOG_SETUP_DLL)
-#       define BOOST_LOG_SETUP_API __declspec(dllimport)
-#   else
+#   if defined(BOOST_LOG_SETUP_DLL)
+#       if defined(BOOST_SYMBOL_IMPORT)
+#           define BOOST_LOG_SETUP_API BOOST_SYMBOL_IMPORT
+#       elif defined(BOOST_HAS_DECLSPEC)
+#           define BOOST_LOG_SETUP_API __declspec(dllimport)
+#       endif
+#   endif
+#   ifndef BOOST_LOG_SETUP_API
 #       define BOOST_LOG_SETUP_API
-#   endif // defined(BOOST_HAS_DECLSPEC)
+#   endif
+
 //
 // Automatically link to the correct build variant where possible.
 //
@@ -48,12 +54,15 @@
 
 #else // !defined(BOOST_LOG_SETUP_BUILDING_THE_LIB)
 
-#   if defined(BOOST_HAS_DECLSPEC) && defined(BOOST_LOG_SETUP_DLL)
-#       define BOOST_LOG_SETUP_API __declspec(dllexport)
-#   elif defined(__GNUC__) && __GNUC__ >= 4 && (defined(linux) || defined(__linux) || defined(__linux__))
-#       define BOOST_LOG_SETUP_API __attribute__((visibility("default")))
-#   else
-#       define BOOST_LOG_SETUP_API
+#   if defined(BOOST_LOG_SETUP_DLL)
+#       if defined(BOOST_SYMBOL_EXPORT)
+#           define BOOST_LOG_SETUP_API BOOST_SYMBOL_EXPORT
+#       elif defined(BOOST_HAS_DECLSPEC)
+#           define BOOST_LOG_SETUP_API __declspec(dllexport)
+#       endif
+#   endif
+#   ifndef BOOST_LOG_SETUP_API
+#       define BOOST_LOG_SETUP_API BOOST_SYMBOL_VISIBLE
 #   endif
 
 #endif // !defined(BOOST_LOG_SETUP_BUILDING_THE_LIB)