Make Q's

[bruce.labitt at autoliv.com]

gnhlug-discuss-bounces at mail.gnhlug.org wrote on 09/18/2009 12:16:15 PM:

> 
> Derek Atkins writes:
> 
> > Perhaps you need an 'extern "C"' in there so C++ knows how to call the 
C
> > functions?
> 
> To cut to the chase, Bruce probably should make sure that all of his C
> functions are declared in C-specific header files that have the
> following pattern:
> 
> 
> 
> #ifndef UTIL_H
> #define UTIL_H
> 
> #ifdef __cplusplus
> extern "C" {
> #endif
> 
> 
> void some_function_with_c_linkage();
> 
> #ifdef __cplusplus
> }
> #endif
> 
> #endif  /* UTIL_H */
> 
> 

Could you explain why this is necessary, and what it does?  What is 
necessary to use this?

> Bruce will also want to make sure that his C functions are compiled by
> an actual C compiler.
> 

My makefile did that.  The C files are compiled with gcc, the C++ files 
with g++.

> This advice is a little bit of my opinion and a little bit of an
> inflexible "you must do this if you want this to work".
> 

I've not seen this type of code before.  I wonder why all of my previous 
code even works.  Surely it is a way to do it.  Is there a simpler way? 
(Not that the above is hard by any means.)


Cheers,
-Bruce


> Regards,
> 
> --kevin
> 


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