Properly link flecs library

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

@@ -0,0 +1,16 @@
+#ifndef CUSTOM_PIPELINE_H
+#define CUSTOM_PIPELINE_H
+
+/* This generated file contains includes for project dependencies */
+#include "custom_pipeline/bake_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

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

@@ -0,0 +1,24 @@
+/*
+                                   )
+                                  (.)
+                                  .|.
+                                  | |
+                              _.--| |--._
+                           .-';  ;`-'& ; `&.
+                          \   &  ;    &   &_/
+                           |"""---...---"""|
+                           \ | | | | | | | /
+                            `---.|.|.|.---'
+
+ * 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 CUSTOM_PIPELINE_BAKE_CONFIG_H
+#define CUSTOM_PIPELINE_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

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

@@ -0,0 +1,11 @@
+{
+    "id": "custom_pipeline",
+    "type": "application",
+    "value": {
+        "use": [
+            "flecs"
+        ],
+        "language": "c++",
+        "public": false
+    }
+}

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

@@ -0,0 +1,40 @@
+#include <custom_pipeline.h>
+#include <iostream>
+
+// Custom pipelines make it possible for applications to override which systems
+// are ran by a pipeline and how they are ordered. Pipelines are queries under
+// the hood, and custom pipelines override the query used for system matching.
+
+// If you only want to use custom phases in addition or in place of the builtin
+// phases see the custom_phases and custom_phases_no_builtin examples, as this 
+// does not require using a custom pipeline.
+
+struct Physics {};
+
+int main(int argc, char *argv[]) {
+    flecs::world ecs(argc, argv);
+
+    // Create a pipeline that matches systems with Physics. Note that this
+    // pipeline does not require the use of phases (see custom_phases) or of the
+    // DependsOn relationship.
+    flecs::entity pipeline = ecs.pipeline()
+        .with(flecs::System) // Mandatory, must always match systems
+        .with<Physics>()
+        .build();
+
+    // Configure the world to use the custom pipeline
+    ecs.set_pipeline(pipeline);
+
+    // Create system with Physics tag
+    ecs.system()
+        .kind<Physics>()
+        .iter([](flecs::iter&) {
+            std::cout << "System ran!\n";
+        });
+
+    // Runs the pipeline & system
+    ecs.progress();
+
+    // Output:
+    //   System ran!
+}