[gst-devel] win32 build works fine

[Benjamin Otte]

On Tue, 15 Jun 2004, Steve Lhomme wrote:

> > I added it in there and modified gstinfo.h to
> > 	GSTREAMER_EXPORT GstDebugCategory *	GST_CAT_DEFAULT;
>
> That's strange for 2 reasons :
> - this is a macro that defines another symbol
> - the program wouldn't link or start if the symbol was not accessible
>
> I added GST_EXPORT to the GST_CAT_DEFAULT declaration. But the defined
> elements are probably missing from the .def yet... (there are actually
> many of them)
>
just FYI:
GST_CAT_DEFAULT is a cute little macro trick inside the debugging system.
The GST_DEBUG, GST_LOG, ... expand something like this:
#define GST_LOG(bla, ...) GST_CAT_LOG(GST_CAT_DEFAULT, bla, ...)
Normally, code with debugging already coded in has this line at the top of
the file:
#define GST_CAT_DEFAULT my_debug_category
in that case the above macro expands to GST_CAT_LOG(my_debug_category,
bla, ...)
But code that does not have the #define needs to work, too (as in:
compile and not crash). Therefore libgstreamer exports a default fallback
debugging category named GST_CAT_DEFAULT, which is what you where talking
about above.
Normal

Hope that clears up some remaining questions.

Benjamin