CODEWITHSUNDEEP
c++visual-studiomingw
James Franco
James Franco

Reputation: 4706

Use of #elif in mingw

I am currently porting some code from Visual studio to mingw and apparently the following code seems to work in Visual Studio but fails in Mingw

#if defined(BATCH_TRIANGLESTRIP)
static const size_t VERT_COUNT = 4;
#elif defined(BATCH_TRIANGLELIST)
static const size_t VERT_COUNT = 6;
#elif //error here on mingw
#error BATCH_TRIANGLESTRIP or BATCH_TRIANGLELIST need to be defined
#endif

My question is with the last #elif I looked over at the documentation of msdn and apparently they dont have a #elif statement without a condition. I wanted to know will the equivalent of above code in mingw be

 #if defined(BATCH_TRIANGLESTRIP)
    static const size_t VERT_COUNT = 4; 
    #elif defined(BATCH_TRIANGLELIST)
    static const size_t VERT_COUNT = 6; 
    #else
    #error BATCH_TRIANGLESTRIP or BATCH_TRIANGLELIST need to be defined
    #endif

This is the error I get with the original code

error: #elif with no expression

Upvotes: 0

Views: 395

Answers (1)

Keith Thompson
Keith Thompson

Reputation: 263257

#elif requires a constant expression according to the C++ standard (and the C standard as well). The failure to diagnose a bare #elif is a bug in Visual Studio.

The equivalent in standard C++ would use #else rather than #elif. Both Visual Studio and MinGW should handle that correctly -- as should any conforming compiler.

Upvotes: 1

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