Hi!
I have two linking questions

1) If I create a module, and then import it in another source file, how come that a function defined in the module is "undefined", if I try to dmd only the source file? I have to compile the module, and then link the source file against the module. Is it right or I'm missing something?

2) Is it possible to make D functions available to a C program? I tried linking the C source code and the D object altogether with phobos, but with errors... what I'm supposed to do?

I thank you in advance:)

Carotinho

Carotinho wrote:
> Hi!
> I have two linking questions
> 
> 1) If I create a module, and then import it in another source file, how come
> that a function defined in the module is "undefined", if I try to dmd only
> the source file? I have to compile the module, and then link the source
> file against the module. Is it right or I'm missing something?

Importing a module gives you the ability to call functions in that module.  However, the function code is only compiled in the *other* module.  The C analogy would be that when you import a module, it's like #include-ing a header, while compiling a module is is like compiling a C file.

So yes, you have to compile and link together all modules which include functions that you need.

> 2) Is it possible to make D functions available to a C program? I tried
> linking the C source code and the D object altogether with phobos, but with
> errors... what I'm supposed to do?

You can make a D function callable from C like this:
	extern(C) int myFunction(<args>) { <code> }

You can make a C function callable from D like this:
	extern(C) int myOtherFunction(<args>);

Russ Lewis wrote:
> 
> You can make a C function callable from D like this:
>     extern(C) int myOtherFunction(<args>);
> 

And, just for clarifying, you need to link the appropriate object file in.

-Sebastian

Sebastian Beschke wrote:

> Russ Lewis wrote:
>> 
>> You can make a C function callable from D like this:
>>     extern(C) int myOtherFunction(<args>);
>> 
> 
> And, just for clarifying, you need to link the appropriate object file in.
> 
> -Sebastian

Thanks!
I -ahem- misread the docs and thought that extern (C) was here just to link
TO C :)
 Byez!