c++ - Global variable dll export/import -


i got usual macros below: 

#ifdef platform_windows     #ifdef build_shared         #define api __declspec(dllexport)     #else         #define api __declspec(dllimport)     #endif #else     #define api #endif

(the lib compiles /dbuild_shared)

then have global union object want export/import:
header file: 

#ifdef __cplusplus   extern "c" {   #endif   //definition of union type    api extern union u global;   #ifdef __cplusplus   }  #endif

source file: 

// include header api union u global;

the lib compiles fine, while linking executable linker error unresolved external symbol _global. i'm using msvc (vs 2015). not sure if c linkage has it. i'm not sure if uses c linkage because intellisense shows __cplusplus not defined in header file quoted above.


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