• int_80h (1/1) Feb 05 2003 Can a C program be linked against a LIB built with D?
• Ilya Minkov (16/18) Feb 05 2003 Sure.
• Ilya Minkov (8/33) Feb 05 2003 Oh, i didn't try, but it might be possible to write
• Burton Radons (22/23) Feb 05 2003 You need to use extern (C) as Ilya says, but you also need to boot up

int_80h <int_80h_member pathlink.com> writes:

Can a C program be linked against a LIB built with D?

Ilya Minkov <midiclub 8ung.at> writes:

int_80h wrote:
 Can a C program be linked against a LIB built with D?
 

Sure.

you write in D something like

extern(C) return_type functionName(type1 name1, type2 mane2)
{
	// function does smth here
}

such a function can be directly consumed by a C programme. You might 
have an (OS-dependant) choice of other calling conventions, noted by 
extern(convention), which you might also want to use in your C program, 
"Pascal" and "Windows". Windows is known to you as "stdcall". The 
difference between both is AFAIK parameter order, and they are both 
faster and safer than the C calling convention, but probably not as fast 
as D internal calling convention. The drawback of "Windows" and "Pascal" 
is that they don't allow var_args, which are to be avoided anyway.

-i.

Ilya Minkov <midiclub 8ung.at> writes:

Oh, i didn't try, but it might be possible to write

extern(convention) {
...
}

and place all your library functions instead of "..." (and don't forget 
to replace "convention"), and thus wrap all at one shot.

-i.


Ilya Minkov wrote:
 int_80h wrote:
 
 Can a C program be linked against a LIB built with D?

 
 Sure.
 
 you write in D something like
 
 extern(C) return_type functionName(type1 name1, type2 mane2)
 {
     // function does smth here
 }
 
 such a function can be directly consumed by a C programme. You might 
 have an (OS-dependant) choice of other calling conventions, noted by 
 extern(convention), which you might also want to use in your C program, 
 "Pascal" and "Windows". Windows is known to you as "stdcall". The 
 difference between both is AFAIK parameter order, and they are both 
 faster and safer than the C calling convention, but probably not as fast 
 as D internal calling convention. The drawback of "Windows" and "Pascal" 
 is that they don't allow var_args, which are to be avoided anyway.
 
 -i.
 

Burton Radons <loth users.sourceforge.net> writes:

int_80h wrote:
 Can a C program be linked against a LIB built with D?

You need to use extern (C) as Ilya says, but you also need to boot up 
the runtime with this in C:

    extern void gc_init();
    extern void gc_term();
    extern void _minit();
    extern void _moduleCtor();
    extern void _moduleUnitTests();

    void Dinit ()
    {
        gc_init ();
        _minit ();
        _moduleCtor ();
        _moduleUnitTests ();
    }

    void Dterm ()
    {
        gc_term ();
    }


Global pointers shared with D might actually work properly, although 
using the same tool in C (DMC) would increase the chances of that.

There're other concerns.  It's not a well-trod path.