function declared static but never defined

Question

I have a header file suppose abc.h, where i have function declaration as:

static int function1();

I have included this header file in abc.c and has defined the function and used it.

static int function1()
{
 < function definition>
}

After compiling I am getting warning:

warning: function1 declared static but never defined

How can I remove warning, without removing static. Thanks.

Move the forward declaration from the header to your source file ? — simonc
If a function is static, you're not supposed to put it in a header file (unless inline)... — user529758
Remove the static keyword from function definition - it's redundant there. Though this should've worked anyway - I suppose the problem is elsewhere. — SomeWittyUsername
Also be careful about the () in C. In a declaration this means that the function may receive any type of arguments. In particular this is not considered to be a prototype of the function. For the definition it means a function that does receive no parameter at all. In C you should always use (void) instead. — Jens Gustedt

hazzelnuttie hazzelnuttie · Accepted Answer · 2013-03-28T12:32:56

A static function can be declared in a header file, but this would cause each source file that included the header file to have its own private copy of the function, which is probably not what was intended.

Are u sure u haven't included the abc.h file in any other .c files?

Because declaring a function as static, requires the function to be defined in all .c file(s) in which it is included.

function declared static but never defined

2 Answers