Re: [Vala] Defininig _GNU_SOURCE...

[Jan Hudec <bulb ucw cz>]

On Sun, Jan 02, 2011 at 20:44:24 +0100, Marco Trevisan (Treviño) wrote:
> Hello, I'm writing a small VAPI file for a GNU hader that requires to be
> included as:
>
>       #define _GNU_SOURCE
>       #include <header_file.h>
>
> Of course I can't do it nor in vala or vapi files, but to compile the
> code I have (avoiding the linker errors) I need to define _GNU_SOURCE...
>
> A solution is running valac as:
>
>       valac myfile.vala -X -D"_GNU_SOURCE"
>
> but, could be added a better way to perform this? Automatizing such
> thing when including a GNU file...

If the header can't be used without this define, the library the header is
from should define it in it's pkg-config file in CFLAGS.

Whenever you give vala the '--pkg mypackage' option, it does two things:
 - loads mypackage.vapi
 - AND adds output of 'pkg-config --cflags mypackage' to C compiler
   command line and output of 'pkg-config --libs mypackage' to linker command
   line.
So the mypackage.pc somewhere on pkg-config's path should contain appropriate
definition.

So if this comes from 3rd party library, discuss adding the define -- or
avoiding the need for it -- with upstream.

-- 
                                                 Jan 'Bulb' Hudec <bulb ucw cz>