Call function in a static library without implementation

Question

I'd like to know if it's possible, within a static library, call a function that the implementation is in my application instead of in the library.

Like this:

Static Library

foo.h

void foo_func();

foo.c

#include "foo.h"

void foo_func()
{
    app_func();
}

Application

main.c

#include <foo.h>

uint8_t flag = FALSE;

uint8 main()
{
    foo_func();

    while(!flag);

    return 0;
}

void app_func()
{
     flag = TRUE;
}

It is, but it's also a very bad way of setting things up. Tell us about your real problem. — Jon, Jul 03 '14 at 20:04
Better to have the application pass a function pointer to the library at runtime. Then it'll work with a dynamic library too. — James M, Jul 03 '14 at 20:29

score 1 · Answer 1 · answered Jul 03 '14 at 20:04

1

A static library created with ar is just an archive of .o object files. You can call any external functions in static library created with ar, present or not, like with any .o file. While it is possible, calling back the application is may be not the best design choice.

answered Jul 03 '14 at 20:04

ouah

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Why is this a bad design choice? – SuperSim135 Jan 31 '20 at 01:11

Call function in a static library without implementation

1 Answers1