Properly link flecs library

engine/libs/flecs/cmake/target_default_compile_functions.cmake

@@ -0,0 +1,48 @@
+
+macro(list_targets RESULT)
+    file(GLOB_RECURSE FILES LIST_DIRECTORIES true RELATIVE ${CUR_DIR} *)
+    set(TARGET_LIST "")
+
+    foreach (FILE ${FILES})
+        if (IS_DIRECTORY ${CUR_DIR}/${FILE})
+            if (EXISTS ${CUR_DIR}/${FILE}/project.json)
+                message(STATUS "Found example ${FILE}")
+                list(APPEND TARGET_LIST ${FILE})
+            endif()
+        endif ()
+    endforeach ()
+
+    set(${RESULT} ${TARGET_LIST})
+endmacro()
+
+macro(create_target TARGET CONFIG)
+    if (CONFIG STREQUAL "")
+        set(TARGET_POSTFIX "")
+    else()
+        set(TARGET_POSTFIX "_${CONFIG}")
+    endif()
+
+    set(TARGET_NAME "${TARGET}${TARGET_POSTFIX}")
+    string(REPLACE "/" "_" TARGET_NAME "${TARGET_NAME}")
+    string(REPLACE "\\" "_" TARGET_NAME "${TARGET_NAME}")
+    set(TARGET_DIR "${CUR_DIR}/${TARGET}")
+
+    file(GLOB SRC ${TARGET_DIR}/src/*.c*)
+    add_executable(${TARGET_NAME} ${SRC})
+
+    target_include_directories(${TARGET_NAME} PUBLIC ${FLECS_DIR}/include)
+    target_include_directories(${TARGET_NAME} PUBLIC ${TARGET_DIR}/include)
+    target_link_libraries(${TARGET_NAME} flecs${TARGET_POSTFIX})
+    endmacro()
+
+function(create_target_c TARGET CONFIG)
+    create_target("${TARGET}" "${CONFIG}")
+    target_default_compile_options_c(${TARGET_NAME})
+    target_default_compile_warnings_c(${TARGET_NAME})
+endfunction()
+
+function(create_target_cxx TARGET CONFIG)
+    create_target("${TARGET}" "${CONFIG}")
+    target_default_compile_options_cxx(${TARGET_NAME})
+    target_default_compile_warnings_cxx(${TARGET_NAME})
+endfunction()