I have converted OpenType positioning tables of Linux Libertine to Graphite format, but the result (combining diacritics) works only in OpenOffice.org and older LibreOffice versions, because Graphite positioning is missing in Graphite 2/LibreOffice 3.4.x, (seemingly) depending from the version of the SILF table. The same problem has already reported by Alexey Kryukov, too: https://sourceforge.net/mailarchive/message.php?msg_id=27098410.
Test files (GDL, TTF, ODT): http://www.numbertext.org/tmp/bugreport.tar.gz
The GDL files are the same, except a plus rule to exceed the inner limit for the automatic SILF v2->v3 change, as reported by the gdlerr.txt file.
this seems to have mysteriously fixed itself with trunk. It may well be due to the updates I submitted to go into 3.5/3.4.4. Positioning is working fine in gr2 and it seems the integration is working OK now as well. I'll keep the bug open until it is confirmed fixed in a release libo.
BTW Please go through the warnings you are seeing in gdlerr.txt and try to get them to go away. The only ones you can safely ignore are number 3521 about vertical overlaps.
Good news. Thanks, László
see bug 3406802