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My understanding was that "extern" wasn't need when declaring functions in header files. However, I'm looking at the git source code, and I see things like this: (in cache-tree.h). 

void prime_cache_tree(struct index_state *, struct tree *);

extern int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);

What's the difference between these two declarations?

Nemo
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  • Or this one: [Is extern keyword for function necessary at all in C?](http://stackoverflow.com/questions/5255535/is-extern-keyword-for-function-necessary-at-all-in-c). – Martin R Nov 07 '15 at 20:25

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