[gps-users] multilanguage compilation

[Alejandro R. Mosteo]

André Laurens wrote:
> Hello,
> 
> Coming back to an old piece of software, I found the following problem 
> when trying to build it under GPS :
> 
> - this software is mainly made of Ada files, with a single C module 
> (i.e. 1 .c + 1 .h files)
> - as far as I can remember, I had nothing to do - except to select Ada 
> and C languages in the project wizard - to get the C functions compiled, 
> put in a .a library, and linked with the Ada application.
> - now I can't get the C file compiled, neither linked with Ada modules - 
>  gnatlink says "undefined reference to `C_name_of_interfaced_function'"
> 
> I lost the former .gpr file, so I can't compare, and I couldn't find the 
> solution in GPS documentation. What did I do wrong?

This happened to me recently and it was because I hadn't enable 
multilanguage build in the GPS preferences [Edit/Preferences/General]. 
Isn't a per project setting, so I was equally puzzled as you.