Merge pull request #1793 from jslee02/fix_build_clang6

Fix build errors with Clang 6 (also resolve #1510)

examples/MultiBody/InvertedPendulumPDControl.cpp

@@ -268,7 +268,7 @@ btMultiBody* createInvertedPendulumMultiBody(btMultiBodyDynamicsWorld* world, GU
         btVector3 posr = local_origin[i+1];
     //	float pos[4]={posr.x(),posr.y(),posr.z(),1};
 
-        float quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
+		const btScalar quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
 		btCollisionShape* shape =0;
 
 		if (i==0)

examples/MultiBody/MultiBodyConstraintFeedback.cpp

@@ -320,7 +320,7 @@ void MultiBodyConstraintFeedbackSetup::initPhysics()
             btVector3 posr = local_origin[i+1];
         //	float pos[4]={posr.x(),posr.y(),posr.z(),1};
 
-            float quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
+			const btScalar quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
 			btCollisionShape* shape =0;
 
 			if (i==0)