You can't terminate char * varargs with 0, since it will be the wrong width on 64-bit platforms. You need to use (char *)0 or NULL. (I'm not sure NULL, strictly speaking, is guaranteed to work by the C standard, but practically speaking it works universally and will continue to work universally because much software depends on it.) In fc-list.c: os = FcObjectSetBuild (FC_FAMILY, FC_STYLE, 0); Seems to be the only instance in fontconfig or Xft.
Thanks for finding this one.
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