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    • Problem with "undefined reference to"

    Posted by dautrevaux on 2018-08-16 10:38 France

    Hi David,

    The problem here is that the math_helper.c file is a C program and your main.cpp is obviously a C++ program. You must slightly modify the math_helper.h file so that it declares its functions correctly to be called from C++: You should add, just after line 47 in math_helper.h:
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    #ifdef __cplusplus
extern "C" {
#endif
    and just before the final #endif
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    #ifdef __cplusplus
}
#endif

    so that your functions are properly declared as C functions when math_helper.h is included in main.cpp.

    Hope this helps,

    Bernard (Ac6)

    Reads: 2180