Properly link flecs library

engine/libs/flecs/test/custom_builds/c/timer/src/main.c

@@ -0,0 +1,52 @@
+#include <timer.h>
+
+typedef struct {
+    int32_t x, y;
+} Position, Velocity;
+
+void Move(ecs_iter_t *it) {
+    Position *p = ecs_field(it, Position, 1);
+    Velocity *v = ecs_field(it, Velocity, 2);
+
+    for (int i = 0; i < it->count; i ++) {
+        p[i].x += v[i].x;
+        p[i].y += v[i].y;
+    }
+}
+
+int main(int argc, char *argv[]) {
+    ecs_world_t *world = ecs_init_w_args(argc, argv);
+
+    ECS_COMPONENT(world, Position);
+    ECS_COMPONENT(world, Velocity);
+
+    ecs_entity_t s = ecs_system_init(world, &(ecs_system_desc_t){
+        .query.filter.terms = {{ .id = ecs_id(Position) }, { .id = ecs_id(Velocity) }},
+        .callback = Move,
+        .entity = ecs_entity(world, {.add = {ecs_dependson(EcsOnUpdate)}}),
+        .interval = 2.9f
+    });
+    assert(s != 0);
+
+    EcsTimer *timer = ecs_get_mut(world, s, EcsTimer);
+    timer->time = 0;
+
+    ecs_entity_t e = ecs_new_id(world);
+    ecs_set(world, e, Position, {10, 20});
+    ecs_set(world, e, Velocity, {1, 2});
+
+    const Position *p = ecs_get(world, e, Position);
+
+    ecs_progress(world, 1.0);
+    ecs_progress(world, 1.0);
+    
+    assert(p->x == 10);
+    assert(p->y == 20);
+
+    ecs_progress(world, 1.0);
+
+    assert(p->x == 11);
+    assert(p->y == 22);
+
+    return ecs_fini(world);
+}