.\Objects\GD32F407_Template.axf: Error: L6218E: Undefined symbol errno (referred from if_api.o).

根据您提供的引用内容，错误信息是".\Objects\GD32F407_Template.axf: Error: L6218E: Undefined symbol errno (referred from if_api.o)"。这个错误意味着在if_api.o文件中引用了一个未定义的符号errno。根据这个错误信息，我们可以推测是if_api.o文件中缺少了对应的库函数文件。你可以检查一下工程文件，确认是否添加了对应库函数的文件。如果没有添加，你需要把对应的库函数文件添加到工程中，这样就能解决这个错误了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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