Re: [Vala] Using LibTIFF (Undefined Reference TIFFOpen and TIFFClose)

[Tim Way <tim way vg>]

I know it's a late reply but I wanted to say thank you to Evan and Leszek
for helping me out!

Tim

On Thu, Mar 29, 2012 at 5:08 PM, Evan Nemerson <evan coeus-group com> wrote:

> On Wed, 2012-03-28 at 09:52 -0500, Tim Way wrote:
> > Hi,
> >
> > I am trying to use LibTIFF to work with mulit-page TIFF files. I cannot
> > seem to get off the starting blocks. I found that libtiff has a .vapi
> file
> > built into vala but when I try to use it with this tidbit of code
> >
> > using Tiff;
> >
> > ...
> >
> > TIFF testobj = new TIFF("/home/xuser/Pictures/Test.tif", "r");
> >
> > ...
> >
> > I get the following errors running my valac command:
> >
> > me host$ valac --pkg gtk+-3.0 --pkg tiff test.vala
> >
> > test.vala:18.12-18.75: warning: local variable `testobj' declared but
> never
> > used
> >       TIFF testobj = new TIFF("/home/xuser/Pictures/Test.tif", "r");
>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > /tmp/cceW1BJ0.o: In function `_vala_main':
> > test.vala.c:(.text+0x207): undefined reference to `TIFFOpen'
> > test.vala.c:(.text+0x252): undefined reference to `TIFFClose'
> > test.vala.c:(.text+0x4af): undefined reference to `TIFFClose'
> > collect2: ld returned 1 exit status
> > error: cc exited with status 256
> > Compilation failed: 1 error(s), 1 warning(s)
> >
> > Is this a problem with the bindings or am I just using this incorrectly?
>
> Vala can only automatically link libraries which provide a pkg-config
> file, which (AFAIK) libtiff does not.  You'll need to manually make sure
> libtiff gets linked... something like this should do the trick:
>
> valac --pkg gtk+-3.0 --pkg tiff -X -ltiff test.vala
>
>
> -Evan