On Sun, Apr 24, 2016 at 05:02:49PM +0000, Michele Della Ciana wrote:
> I'm trying to install the minimal module in the totorial's section but
> when I start gwyddion it says:
>
> (gwyddion:6946): GLib-GObject-WARNING **: cannot register existing type
> 'gchar'
>
> **
> GLib-GObject:ERROR:gvaluetypes.c:455:_g_value_types_init: assertion failed:
> (type == G_TYPE_CHAR)
This means some GLib initialisation is done twice. But since this is
not happening in Linux there is some difference in linking and library
loading – and as I do not understand the fine points of the OS X linker
I do not know where exactly.
> To copile the module as a shared library I used:
>
> gcc -fPIC -shared -o module.so main.cpp `pkg-config --cflags --libs gwyddion`
>
> where main.cpp is the source code of the minimal module.
I would try removing --libs. This, i.e. with libraries resolved through
the main program, is how we normally link all built-in modules in Unix.
It ensures not only library consistency but also faster startup.
The second thing to check would be renaming the file to .c, i.e. trying
to compile it as C instead of C++. It should not make a difference but
it is better to be sure.
The third thing would be trying the sample standalone module
http://gwyddion.net/apps/#sample-module
because it is linked using libtool that should know the right magic
linker flags for the corresponding operating system. While your command
works for me I do not know if it does the right thing in OS X.
BTW, I found a bug in the example. It will print
GwyApp-WARNING: Invalid function name my_invert_value.
The logging support was not tested... Replace
gwy_app_channel_log_add(data, id, id, "my_invert_value", NULL);
with
gwy_app_channel_log_add_proc(data, id, id);
to get rid of the warning.
Regards,
Yeti
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