Add -libc++ to Darwin builds

Author: deanberris

CMakeLists.txt

@@ -79,6 +79,7 @@ elseif (${CMAKE_CXX_COMPILER_ID} MATCHES Clang)
   if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     # Use libc++ only in OS X.
     set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lc++")
   endif()
 endif()
 

libs/network/src/CMakeLists.txt

@@ -44,9 +44,6 @@ set_target_properties(cppnetlib-client-connections
 if (OPENSSL_FOUND)
     target_link_libraries(cppnetlib-client-connections ${OPENSSL_LIBRARIES})
 endif ()
-if (Boost_FOUND)
-    target_link_libraries(cppnetlib-client-connections)
-endif ()
 install(TARGETS cppnetlib-client-connections
     EXPORT cppnetlibTargets
     PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_FULL_INCLUDEDIR}