While building grilo 0.2 release on the openSUSE Build Service, the build root check at the end raised this error:

E: grilo 64bit-portability-issue grilo-test.c:246, 247, 248

The error is raised based on compiler warnings, which are known to have ill effects, in this case:

grilo-test.c: In function 'simple_playlist_search':
grilo-test.c:246:9: warning: assignment makes pointer from integer without a cast [enabled by default]
grilo-test.c:247:9: warning: assignment makes pointer from integer without a cast [enabled by default]
grilo-test.c:248:9: warning: assignment makes pointer from integer without a cast [enabled by default]

Looking at the built .c file, the issue is rather clear (not the fix though, as it comes from vala code):

[...]
        GParamSpec* _tmp0_;
        GParamSpec* _tmp1_;
        GParamSpec* _tmp2_;
[...]
        _tmp0_ = GRL_METADATA_KEY_ID;
        _tmp1_ = GRL_METADATA_KEY_TITLE;
        _tmp2_ = GRL_METADATA_KEY_URL;


So, we do assign an int (GRL_METADATA_KEY_ID == 15) to a pointer...