c - 如何在cmake中根据条件包含目录

Question

我正在使用windriver编译。我按照以下步骤

set(var_1)
if(var_1)
 target_include_directories(cfar  PRIVATE ${APP_DIR}/z7b/variant_1)
else
 target_include_directories(cfar  PRIVATE ${APP_DIR}/z7b/variant_2)
endif()