osx - Porting C code with #ifdef and #ifndef (C preprocessor) -

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i'm porting iphone game mac , i'm writing file common defines has following:

// first reset defines  #undef target_iphone #undef target_mac  // set defines  #if target_os_mac #if target_os_iphone #define target_iphone #else #define target_mac #endif #endif  #ifdef target_iphone #error err1 #endif  #ifndef target_iphone #error err2 #endif

but when building iphone, both err1 , err2 thrown compiler.

i don't it, what's problem there?

edit: after hour of trying things no luck, had add own define xcode build options.

your code fine. on compiler (gcc mingw) #error err2 thrown. , if insert 

#define target_os_mac 1 #define target_os_iphone 1

where // set defines is, #error err1 thrown.


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