extern “C” error #2040: expected an identifier

gpc.c를 컴파일하다가 발생한 에러

[해법]

The extern "C" construct is a C++ specific thing, it can’t be used in C. And the compiler treats your source file as a C source file since it has the extension .c.

[참고문헌]

https://stackoverflow.com/questions/16192872/extern-c-error-2040-expected-an-identifier

https://shoon950.tistory.com/entry/함수-오버로딩-extern-C-cplusplus-매크로

https://dojang.io/mod/page/view.php?id=802

[교훈]

확장자 .c와 .cpp의 차이를 기억하자.

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