build: prepare testbed executable

testbed/CMakeLists.txt

@@ -0,0 +1,33 @@
+# Testbed configuration
+
+add_executable(testbed)
+
+set(ENTT_TESTBED_EXECUTABLE testbed)
+
+set_target_properties(testbed PROPERTIES CXX_EXTENSIONS OFF)
+target_compile_features(testbed PUBLIC ${ENTT_CXX_STD})
+
+target_compile_definitions(
+    ${ENTT_TESTBED_EXECUTABLE}
+    PRIVATE
+        ENTT_ID_TYPE=${ENTT_ID_TYPE}
+        NOMINMAX
+)
+
+target_sources(
+	${ENTT_TESTBED_EXECUTABLE}
+	PRIVATE
+		testbed.cpp
+)
+
+target_link_libraries(
+    ${ENTT_TESTBED_EXECUTABLE}
+    PRIVATE
+        EnTT::EnTT
+)
+
+target_include_directories(
+    ${ENTT_TESTBED_EXECUTABLE}
+    PRIVATE
+        ${testbed_SOURCE_DIR}
+)

testbed/testbed.cpp

@@ -0,0 +1,6 @@
+#include <entt/entt.hpp>
+
+int main() {
+    [[maybe_unused]] entt::registry registry;
+    return 0;
+}