Why should I use "extern" for function declaration in C? -


this question has answer here:

i wondering if there difference if skip extern storage class specifier while declaring function? specifically, there difference between following two?

void foo ();

and

extern void foo();

is there difference between following two?

basically, no.

each function declaration, extern default, (i.e., in absence of specific storage-class specifier).

quoting c11, chapter §6.2.2, linkages of identifiers

if declaration of identifier function has no storage-class specifier, linkage determined if declared storage-class specifier extern.


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