Tweak other makefiles for OSX

node-to-rust/Makefile

@@ -1,9 +1,15 @@
-all: target/libdouble_input.so
+ifeq ($(shell uname),Darwin)
+    EXT := dylib
+else
+    EXT := so
+endif
+
+all: target/libdouble_input.$(EXT)
 	node src/main.js
 
-target/libdouble_input.so: src/lib.rs Cargo.toml
+target/libdouble_input.$(EXT): src/lib.rs Cargo.toml
 	cargo build
-	(cd target && ln -nsf debug/libdouble_input-* libdouble_input.so)
+	(cd target && ln -nsf debug/libdouble_input-*$(EXT) libdouble_input.$(EXT))
 
 clean:
 	rm -rf target

node-to-rust/src/main.js

@@ -1,6 +1,6 @@
 var ffi = require('ffi');
 
-var lib = ffi.Library('target/libdouble_input.so', {
+var lib = ffi.Library('target/libdouble_input', {
   'double_input': [ 'int', [ 'int' ] ]
 });