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c++ - gets() is causing compilation failure with ''use of undeclared identifier 'gets'" error - Stack Overflow
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arrays - undeclared identifier when adding additional functions after my main in C++? - Stack Overflow
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ios - What can be the cause of "use of undeclared identifier LOG_LEVEL_VERBOSE" message - Stack Overflow
![Disconnect3d on Twitter: "GCC: Hey, this is an undeclared identifier. Did you mean another undeclared identifier? Clang: Hey, this is an undeclared identifier. https://t.co/vYkUgh0EGG" / Twitter Disconnect3d on Twitter: "GCC: Hey, this is an undeclared identifier. Did you mean another undeclared identifier? Clang: Hey, this is an undeclared identifier. https://t.co/vYkUgh0EGG" / Twitter](https://pbs.twimg.com/media/D-CdE-kWkAM2jzd.jpg:large)