Hi, I'm trying to get a "hello world" going to call a C function from [1]glib. I'm having problems compiling, what would the correct command line options?

% dmd -I/usr/include/glib-2.0 hello.d -L-L/usr/local/lib -L-lglib-2.0
hello.d(3): Error: undefined identifier GDateTime
hello.d(3): Error: undefined identifier GTimeZone

% cat hello.d
import std.stdio;
extern(C) GDateTime *g_date_time_new_now (GTimeZone *tz);
void main() {
  writeln("Hello, world");
  GDateTime *gdt;
}

I've got the [2]Interfacing to C page bookmarked :-)

Thanks for any help, Sonia.

References

1. http://developer.gnome.org/glib/2.34/
2. http://dlang.org/interfaceToC.html

On Tuesday, 18 December 2012 at 18:24:03 UTC, Sonia Hamilton wrote:

> [1]glib. I'm having problems compiling, what would the correct command
> line options?
>
> % dmd -I/usr/include/glib-2.0 hello.d -L-L/usr/local/lib -L-lglib-2.0
> hello.d(3): Error: undefined identifier GDateTime
> hello.d(3): Error: undefined identifier GTimeZone

Your problem isn't the command line options, but that you're missing definitions of GDateTime and GTimeZone. You'll need to define those somewhere, perhaps the top of your file here for testing, so that D can know what they are.

>
> I've got the [2]Interfacing to C page bookmarked :-)
>
> Thanks for any help, Sonia.
>
> References
>
> 1. http://developer.gnome.org/glib/2.34/
> 2. http://dlang.org/interfaceToC.html

You might want to add this series as well, starting with part 1:
http://www.gamedev.net/blog/1140/entry-2254003-binding-d-to-c/

On Tuesday, 18 December 2012 at 19:21:09 UTC, Mike Parker wrote:
> On Tuesday, 18 December 2012 at 18:24:03 UTC, Sonia Hamilton wrote:
>
>> [1]glib. I'm having problems compiling, what would the correct command
>> line options?
>>
>> % dmd -I/usr/include/glib-2.0 hello.d -L-L/usr/local/lib -L-lglib-2.0
>> hello.d(3): Error: undefined identifier GDateTime
>> hello.d(3): Error: undefined identifier GTimeZone
>
> Your problem isn't the command line options, but that you're missing definitions of GDateTime and GTimeZone. You'll need to define those somewhere, perhaps the top of your file here for testing, so that D can know what they are.

I just took a look at the GLib docs and see that both of these are opaque structs, so this should do it for you:

struct GDateTime;
struct GTimeZone;

On 12/18/12 20:23, Mike Parker wrote:
> On Tuesday, 18 December 2012 at 19:21:09 UTC, Mike Parker wrote:
>> On Tuesday, 18 December 2012 at 18:24:03 UTC, Sonia Hamilton wrote:
>>
>>> [1]glib. I'm having problems compiling, what would the correct command line options?
>>>
>>> % dmd -I/usr/include/glib-2.0 hello.d -L-L/usr/local/lib -L-lglib-2.0
>>> hello.d(3): Error: undefined identifier GDateTime
>>> hello.d(3): Error: undefined identifier GTimeZone
>>
>> Your problem isn't the command line options, but that you're missing definitions of GDateTime and GTimeZone. You'll need to define those somewhere, perhaps the top of your file here for testing, so that D can know what they are.
> 
> I just took a look at the GLib docs and see that both of these are opaque structs, so this should do it for you:
> 
> struct GDateTime;
> struct GTimeZone;
> 

And if you don't want to do all of that manually, you could use

   http://repo.or.cz/w/girtod.git

which would make a simple glib D hello-world program look like

   import glib = gtk2.glib2;
   import std.stdio, std.conv;

   void main() {
      auto tz = glib.TimeZone.new_local();
      scope (exit) tz.unref();
      auto dt = glib.DateTime.new_now(tz);
      scope (exit) dt.unref();
      writeln("Hello World! It is " ~ to!string(dt.format("%c")));
   }

Compile with

   gdc -fdeprecated -O2 -I $PATH_TO_GIRTOD  glibhello.d $PATH_TO_GIRTOD/gtk2/glib2.o `pkg-config --libs glib-2.0`


This might only work with GDC right now; I have no idea about DMD - never tried it. There are other gtk bindings out there (eg gtkd) that may work with that compiler and probably support glib too.

artur

Thanks for all those replies, they really help :)

Sonia.

On Wed, Dec 19, 2012, at 7:05, Artur Skawina wrote:
> On 12/18/12 20:23, Mike Parker wrote:
> > On Tuesday, 18 December 2012 at 19:21:09 UTC, Mike Parker wrote:
> >> On Tuesday, 18 December 2012 at 18:24:03 UTC, Sonia Hamilton wrote:
> >>
> >>> [1]glib. I'm having problems compiling, what would the correct command line options?
> >>>
> >>> % dmd -I/usr/include/glib-2.0 hello.d -L-L/usr/local/lib -L-lglib-2.0
> >>> hello.d(3): Error: undefined identifier GDateTime
> >>> hello.d(3): Error: undefined identifier GTimeZone
> >>
> >> Your problem isn't the command line options, but that you're missing definitions of GDateTime and GTimeZone. You'll need to define those somewhere, perhaps the top of your file here for testing, so that D can know what they are.
> > 
> > I just took a look at the GLib docs and see that both of these are opaque structs, so this should do it for you:
> > 
> > struct GDateTime;
> > struct GTimeZone;
> > 
> 
> And if you don't want to do all of that manually, you could use
> 
>    http://repo.or.cz/w/girtod.git
> 
> which would make a simple glib D hello-world program look like
> 
>    import glib = gtk2.glib2;
>    import std.stdio, std.conv;
> 
>    void main() {
>       auto tz = glib.TimeZone.new_local();
>       scope (exit) tz.unref();
>       auto dt = glib.DateTime.new_now(tz);
>       scope (exit) dt.unref();
>       writeln("Hello World! It is " ~ to!string(dt.format("%c")));
>    }
> 
> Compile with
> 
>    gdc -fdeprecated -O2 -I $PATH_TO_GIRTOD  glibhello.d
>    $PATH_TO_GIRTOD/gtk2/glib2.o `pkg-config --libs glib-2.0`
> 
> 
> This might only work with GDC right now; I have no idea about DMD - never
> tried it.
> There are other gtk bindings out there (eg gtkd) that may work with that
> compiler
> and probably support glib too.
> 
> artur