Slightly more proper CMake nonsense

skeleton/CMakeLists.txt

@@ -3,7 +3,18 @@ add_library(SkeletonPass MODULE
     Skeleton.cpp
 )
 
+# Use C++11 to compile our pass (i.e., supply -std=c++11).
+target_compile_features(SkeletonPass PRIVATE cxx_range_for cxx_auto_type)
+
+# LLVM is (typically) built with no C++ RTTI. We need to match that.
+set_target_properties(SkeletonPass PROPERTIES
+    COMPILE_FLAGS "-fno-rtti"
+)
+
+# Get proper shared-library behavior (where symbols are not necessarily
+# resolved when the shared library is linked) on OS X.
+if(APPLE)
     set_target_properties(SkeletonPass PROPERTIES
-    COMPILE_FLAGS "-std=c++11 -fno-rtti"
         LINK_FLAGS "-undefined dynamic_lookup"
     )
+endif(APPLE)