#ifdef __linux

引用中提到了Linux底层代码中出现的#define、#ifdef和#endif。而引用中介绍了在C编程中经常遇到的#ifdef和#endif的使用方式。通过这些宏定义和条件编译指令，可以根据不同的平台进行代码的移植，提高软件的移植性。而引用中指出，#ifdef CONFIG_XXX只能判断是否设置为y，即编译进内核。据此我们可以得出结论：#ifdef __linux是用来判断是否在Linux平台下进行编译的条件预编译指令。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [预编译#define_#ifdef_#endif用法](https://download.csdn.net/download/zyp20121234/7162869)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [C++编程时#ifdef _WIN32的作用](https://blog.csdn.net/weixin_42432402/article/details/105032211)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [#define IS_ENABLED(CONFIG_XXX)和#ifdef CONFIG_XXX](https://blog.csdn.net/mabin2005/article/details/128342328)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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