Properly link flecs library

engine/libs/flecs/examples/cpp/systems/pipeline/.gitignore

@@ -0,0 +1,5 @@
+.bake_cache
+.DS_Store
+.vscode
+gcov
+bin

engine/libs/flecs/examples/cpp/systems/pipeline/include/pipeline.h

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+#ifndef PIPELINE_H
+#define PIPELINE_H
+
+/* This generated file contains includes for project dependencies */
+#include "pipeline/bake_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

engine/libs/flecs/examples/cpp/systems/pipeline/include/pipeline/bake_config.h

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+/*
+                                   )
+                                  (.)
+                                  .|.
+                                  | |
+                              _.--| |--._
+                           .-';  ;`-'& ; `&.
+                          \   &  ;    &   &_/
+                           |"""---...---"""|
+                           \ | | | | | | | /
+                            `---.|.|.|.---'
+
+ * This file is generated by bake.lang.c for your convenience. Headers of
+ * dependencies will automatically show up in this file. Include bake_config.h
+ * in your main project file. Do not edit! */
+
+#ifndef PIPELINE_BAKE_CONFIG_H
+#define PIPELINE_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/cpp/systems/pipeline/project.json

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+{
+    "id": "pipeline",
+    "type": "application",
+    "value": {
+        "author": "Jane Doe",
+        "description": "A simple hello world flecs application",
+        "use": [
+            "flecs"
+        ],
+        "language": "c++"
+    }
+}

engine/libs/flecs/examples/cpp/systems/pipeline/src/main.cpp

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+#include <pipeline.h>
+#include <iostream>
+
+struct Position { 
+    double x, y;
+};
+
+struct Velocity { 
+    double x, y;
+};
+
+int main(int, char *[]) {
+    flecs::world ecs;
+
+    // Create a system for moving an entity
+    ecs.system<Position, const Velocity>()
+        .kind(flecs::OnUpdate) // A phase orders a system in a pipeline
+        .each([](Position& p, const Velocity& v) {
+            p.x += v.x;
+            p.y += v.y;
+        });
+
+    // Create a system for printing the entity position
+    ecs.system<const Position>()
+        .kind(flecs::PostUpdate)
+        .each([](flecs::entity e, const Position& p) {
+            std::cout << e.name() << ": {" << p.x << ", " << p.y << "}\n";
+        });
+
+    // Create a few test entities for a Position, Velocity query
+    ecs.entity("e1")
+        .set<Position>({10, 20})
+        .set<Velocity>({1, 2});
+
+    ecs.entity("e2")
+        .set<Position>({10, 20})
+        .set<Velocity>({3, 4});
+
+    // Run the default pipeline. This will run all systems ordered by their
+    // phase. Systems within the same phase are ran in declaration order. This
+    // function is usually called in a loop.
+    ecs.progress();
+}