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objective c - Invalid preprocessing directive for #elseifdef in Xcode

问题描述:

Why:

 #ifdef SOME_TARGET_FLAG

<some code here>

#elseifdef SOME_ANOTHER_TARGET_FLAG

<some another code here>

#endif

produces "Invalid preprocessing directive" preprocess compilation error?

SOME_TARGET_FLAG and SOME_ANOTHER_TARGET_FLAG are just some "Other C-flags" defined in target build settings (-D<FLAG_NAME> pattern).

Is #elseifdef directive not supported by Xcode?

网友答案:

Is #elseifdef directive not supported by Xcode?

It is not. Use this instead:

#elif defined(SOME_ANOTHER_TARGET_FLAG)
网友答案:

Its not supported as indicated by the error message. See 'the C preprocessor' - https://developer.apple.com/library/mac/#documentation/DeveloperTools/gcc-4.2.1/cpp/index.html#//apple_ref/doc/uid/TP40007092 (conditional compilation).

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