[LIBINFO] Enable load .dylib on darwin (#142)

* [LIBINFO] Enable load .dylib on darwin

* Fix makefile

nnvm/Makefile

@@ -39,22 +39,23 @@ include $(NNVM_PLUGINS)
 # specify tensor path
 .PHONY: clean all test lint doc cython cython3 cyclean
 
-all: lib/libnnvm.a lib/libnnvm_example.so
-
-SRC = $(wildcard src/*.cc src/*/*.cc)
-ALL_OBJ = $(patsubst %.cc, build/%.o, $(SRC))
-ALL_DEP = $(ALL_OBJ) $(PLUGIN_OBJ)
-
 UNAME_S := $(shell uname -s)
 
 ifeq ($(UNAME_S), Darwin)
+	SHARED_LIBRARY_SUFFIX := dylib
 	WHOLE_ARCH= -all_load
 	NO_WHOLE_ARCH= -noall_load
 else
+	SHARED_LIBRARY_SUFFIX := so
 	WHOLE_ARCH= --whole-archive
 	NO_WHOLE_ARCH= --no-whole-archive
 endif
 
+all: lib/libnnvm.a lib/libnnvm_example.$(SHARED_LIBRARY_SUFFIX)
+
+SRC = $(wildcard src/*.cc src/*/*.cc)
+ALL_OBJ = $(patsubst %.cc, build/%.o, $(SRC))
+ALL_DEP = $(ALL_OBJ) $(PLUGIN_OBJ)
 
 include tests/cpp/unittest.mk
 
@@ -74,7 +75,7 @@ lib/libnnvm.a: $(ALL_DEP)
 	@mkdir -p $(@D)
 	ar crv $@ $(filter %.o, $?)
 
-lib/libnnvm_example.so: example/src/operator.cc lib/libnnvm.a
+lib/libnnvm_example.$(SHARED_LIBRARY_SUFFIX): example/src/operator.cc lib/libnnvm.a
 	@mkdir -p $(@D)
 	$(CXX) $(CFLAGS) -shared -o $@ $(filter %.cc, $^) $(LDFLAGS) -Wl,${WHOLE_ARCH} lib/libnnvm.a -Wl,${NO_WHOLE_ARCH}
 
@@ -85,7 +86,7 @@ cython3:
 	cd python; python3 setup.py build_ext --inplace
 
 cyclean:
-	rm -rf python/nnvm/*/*.so python/nnvm/*/*.cpp
+	rm -rf python/nnvm/*/*.so python/nnvm/*/*.dylib python/nnvm/*/*.cpp
 
 lint:
 	python2 dmlc-core/scripts/lint.py nnvm cpp include src

nnvm/python/nnvm/libinfo.py

@@ -31,7 +31,13 @@ def find_lib_path():
     api_path = os.path.join(base_path, '../../lib/')
     cmake_build_path = os.path.join(base_path, '../../build/Release/')
     dll_path = [base_path, api_path, cmake_build_path]
-    if os.name == 'nt':
+
+    if sys.platform.startswith('linux') and os.environ.get('LD_LIBRARY_PATH', None):
+        dll_path.extend([p.strip() for p in os.environ['LD_LIBRARY_PATH'].split(":")])
+    elif sys.platform.startswith('darwin') and os.environ.get('DYLD_LIBRARY_PATH', None):
+        dll_path.extend([p.strip() for p in os.environ['DYLD_LIBRARY_PATH'].split(":")])
+
+    if sys.platform.startswith('win32'):
         vs_configuration = 'Release'
         if platform.architecture()[0] == '64bit':
             dll_path.append(os.path.join(curr_path, '../../build', vs_configuration))
@@ -39,12 +45,12 @@ def find_lib_path():
         else:
             dll_path.append(os.path.join(curr_path, '../../build', vs_configuration))
             dll_path.append(os.path.join(curr_path, '../../windows', vs_configuration))
-    elif os.name == "posix" and os.environ.get('LD_LIBRARY_PATH', None):
-        dll_path.extend([p.strip() for p in os.environ['LD_LIBRARY_PATH'].split(":")])
-    if os.name == 'nt':
         dll_path = [os.path.join(p, '%s.dll' % lib_name) for p in dll_path]
+    elif sys.platform.startswith('darwin'):
+        dll_path = [os.path.join(p, '%s.dylib' % lib_name) for p in dll_path]
     else:
         dll_path = [os.path.join(p, '%s.so' % lib_name) for p in dll_path]
+
     lib_path = [p for p in dll_path if os.path.exists(p) and os.path.isfile(p)]
     if len(lib_path) == 0:
         raise RuntimeError('Cannot find the files.\n' +