Nios II - mixed C and C++ project problem

Question

Hi everybody,  I&amp;#39;m a newbie with Nios II IDE (Version: 9.0 Build: 132) and have following problem when building project with both C and C++ (.cpp) files.  - project with source files (all .cpp) is built and can be run on HW (Cyclone II DSP development board) without problems  - another project with all sources as .c files can be built and runs on HW  Problem: when I want to add .cpp source file to project with .c files, all files are compiled, but linker can&amp;#39;t find functions from .cpp file and I get "undefined reference to ..." error.   So my question is, how do I setup IDE or where is the setting/flag in the project properties?   Dusan

altera_forum · Answer

Use extern "C" when mixing C++ and C code __cplusplus will be automatically defined if your compiler is a C++ compiler   Use this in your header files ...  #if defined(__cplusplus)
extern "C" {     // Make sure we have C-declarations in C++ programs # endif
    void yourCFunction(); 
# if defined(__cplusplus)
  }# endif   Have a look a this link http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html (http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html)  Best regards

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Nios II - mixed C and C++ project problem

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