CMakeBuild doesnt do anything if no extension(s)

Author: tlestang

CMakeBuild.py

@@ -47,6 +47,9 @@ def finalize_options(self):
             self.sundials_root = os.path.join(default_lib_dir)
 
     def run(self):
+        if not self.extensions:
+            return
+
         cmake_args = ["-DPYTHON_EXECUTABLE={}".format(sys.executable)]
         if self.suitesparse_root:
             cmake_args.append(