how to compile cpp and c together using clang++

Asked May 25 '15 at 07:54

Active May 25 '15 at 07:54

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I have some code in cpp (where the main() lies) and want to call functions located in a c file. Compiling the cpp's and the c's give the output .o files, but when using clang++ to generate the final executable, it is failing because the cpp is unable to find the c function:

Undefined symbols for architecture x86_64:
  "FunctionInCFile(char const*, char const*, int, int, int, int)", referenced from:
      FunctionInCPPFile() in helixQtCmd.o
ld: symbol(s) not found for architecture x86_64

asked May 25 '15 at 07:54

Laurent Crivello

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Use `extern C { }` to wrap the c language function declarations. – πάντα ῥεῖ May 25 '15 at 07:58
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Or simply compile all your sources with clang++. – Mats Petersson May 25 '15 at 08:00
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possible duplicate of [how does "extern c" works in C++](http://stackoverflow.com/questions/9190455/how-does-extern-c-works-in-c) – Ken Y-N May 25 '15 at 08:01
Mmmh, getting 'error: expected unqualified-id extern "C" {' when compiling. Any clue why ? – Laurent Crivello May 25 '15 at 08:24
It's EASIER to just compile all files with the C++ compiler, if it works. Otherwise, you will need to put `#if __cplusplus` around the `extern "C" {` (and the `}` that goes with it. – Mats Petersson May 25 '15 at 08:46
Compiling with clang++ doesn't really work as option as it finds plenty errors in the c code that clang accepts. – Laurent Crivello May 25 '15 at 09:22

how to compile cpp and c together using clang++

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