On Sunday, 5 January 2014 at 19:55:50 UTC, Mineko wrote:
On Sunday, 5 January 2014 at 19:47:46 UTC, FreeSlave wrote:
Some code snippets of what you try to do would help.
Maybe this example explain you something:
//mod.d
extern(C) int foo = 42;
void changeFoo(int val)
{
foo = val;
}
//main.d
import std.stdio;
import mod;
int main()
{
writeln(foo);
changeFoo(15);
writeln(foo);
return 0;
}
Compile:
dmd -H -c mod.d && //to generate .di file (not required)
dmd -shared mod.d -oflibmod.so && //to generate shared library
dmd -L-L. -L-lmod -L-rpath=. main.d //rpath is special
argument to linker, so executable will able to find shared
library in its directory. You can omit rpath, but then you
must put your .so file to one of standard directory like
/usr/lib or /usr/local/lib. That's all for Linux. On Windows
you would have different building steps.
Also probably you want to make your varialbe __gshared, so it
will not be thread-local. That's default D behavior to make
all global variables thread-local. And I don't know how other
languages will handle D thread-local variable.
Ahh I appreciate it, but I already have that part down and
good. :)
I was wondering about how to use export correctly, I apologize
for not being clear.
Also I'll keep in mind the __gshared, never even knew about it.
Yeah, the documentation could definitely be better in this
regard. I don't really have any experience when it comes to
linking to D shared libraries. All my experience comes from
linking with C ones.
I might try it out later today just to make sure I have it right,
but it should be something kind of like this:
libstuff.d
//extern(C) only added because that is what you have been doing
export extern(C) void someFunction(int thing)
{
//doing stuff with the thing
}
extern(C) void otherFunction(int otherThing)
{
//stuff with a different thing
}
Assuming libstuff gets put into the shared library
main.d
import libstuff;
void main(sring[] args)
{
int sweetVariable = 100;
someFunction(sweetVariable);//should be ok
otherFunction(sweetVariable);//error, not exported
}
Again, I cannot confirm that this is the exact way to do it, but
it should be something very similar from what the documentation
leads me to believe.
