Fix lib dir of cmake build and improve test snippet (#1198)

packages/b/box2d/xmake.lua

@@ -18,8 +18,10 @@ package("box2d")
         import("package.tools.cmake").build(package, configs, {buildir = "build"})
         if package:is_plat("windows") then
             os.trycp(path.join("build", "src", "*", "*.lib"), package:installdir("lib"))
+            os.trycp(path.join("build", "bin", "*", "*.lib"), package:installdir("lib"))
         else
             os.trycp("build/src/*.a", package:installdir("lib"))
+            os.trycp("build/bin/*.a", package:installdir("lib"))
         end
         os.cp("include", package:installdir())
     end)
@@ -28,6 +30,26 @@ package("box2d")
         assert(package:check_cxxsnippets({test = [[
             void test(int argc, char** argv) {
                 b2World world(b2Vec2(0.0f, -10.0f));
+                b2BodyDef bodyDef;
+                bodyDef.type = b2_dynamicBody;
+                bodyDef.position.Set(0.0f, 4.0f);
+                b2Body* body = world.CreateBody(&bodyDef);
+                b2PolygonShape dynamicBox;
+                dynamicBox.SetAsBox(1.0f, 1.0f);
+                b2FixtureDef fixtureDef;
+                fixtureDef.shape = &dynamicBox;
+                fixtureDef.density = 1.0f;
+                fixtureDef.friction = 0.3f;
+                body->CreateFixture(&fixtureDef);
+                float timeStep = 1.0f / 60.0f;
+                int32 velocityIterations = 6;
+                int32 positionIterations = 2;
+                for (int32 i = 0; i < 60; ++i)
+                {
+                    world.Step(timeStep, velocityIterations, positionIterations);
+                    b2Vec2 position = body->GetPosition();
+                    float angle = body->GetAngle();
+                }
             }
         ]]}, {configs = {languages = "c++11"}, includes = "box2d/box2d.h"}))
     end)