From 6e02e3707a19f8f0aef00a0e83778ff199bb61ac Mon Sep 17 00:00:00 2001
From: Jean-Louis Leroy <jl@leroy.nyc>
Date: Thu, 11 Aug 2016 16:30:13 -0400
Subject: [PATCH] Make dynamic loading example work on OSX.

---
 examples/CMakeLists.txt | 6 +++++-
 examples/dl_main.cpp    | 8 +++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index be279e1..ba9d55e 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -20,7 +20,11 @@ add_executable(matrix matrix.cpp)
 target_link_libraries (matrix yomm11)
 
 if(NOT MSVC)
-  add_library( dl_shared SHARED dl_shared.cpp )
   add_executable(dl_main dl_main.cpp)
+  add_library( dl_shared SHARED dl_shared.cpp )
+  if(APPLE)
+    set_target_properties(dl_main PROPERTIES LINK_FLAGS "-Wl,-export_dynamic")
+    set_target_properties(dl_shared PROPERTIES LINK_FLAGS "-Wl,-undefined,dynamic_lookup")
+  endif()
   target_link_libraries (dl_main yomm11 dl dl_shared)
 endif()
diff --git a/examples/dl_main.cpp b/examples/dl_main.cpp
index b123db8..ab92f02 100644
--- a/examples/dl_main.cpp
+++ b/examples/dl_main.cpp
@@ -36,7 +36,13 @@ int main() {
   cout << "encounter(Cow(), Wolf()) -> " << encounter(Cow(), Wolf()) << endl;
   cout << "encounter(Wolf(), Cow()) -> " << encounter(Wolf(), Cow()) << endl;
 
-  void* handle = dlopen("./libdl_shared.so", RTLD_NOW);
+  void* handle = dlopen(
+#ifdef __APPLE__
+      "./libdl_shared.dylib"
+#else
+      "./libdl_shared.so"
+#endif
+      , RTLD_NOW);
 
   if (!handle) {
     cout << "dlopen() failed: " << dlerror() << "\n";