FcDirSave man page
FcDirSave — DEPRECATED: formerly used to save a directory cache
#include <fontconfig/fontconfig.h> FcBool FcDirSave (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir);
This function now does nothing aside from returning FcFalse. It used to creates the per-directory cache file for dir and populates it with the fonts in set and subdirectories in dirs. All of this functionality is now automatically managed by FcDirCacheLoad and FcDirCacheRead.