I created a static library in C , that is, after compiling the file .c , generated a file with .a extension. In the file .c I implemented some functions. How could I read this lib in another program and call a function from it? I'm just giving the .h include in the program, and when I compile the program it displays in the error message: undefined reference to func () which follows just below:
#ifndef STATIC_H
#define STATIC_H
extern int func();
#endif
First option and I think you should have tried is to use the header:
#include "libstatic.a"
Point to the correct location for the library.
2nd option found in this response from SOen : / p>
cc -o yourprog yourprog.c -lstatic
or
cc -o yourprog yourprog.c libstatic.a
3rd Option also found in SOen:
gcc -I. -o jvct jvct.c libjvc.a
I found a link that teaches you how to create a Lib in C (see if you have not forgotten any steps) Link
I believe you have already created a .h by exporting library functions; if you did, just include the .a in the line that mounts your executable.
Well, I'd better put a more complete example:
test.h:
#ifndef STATIC_H
#define STATIC_H
extern int func();
#endif
static.c:
#include "teste.h"
int func() {
return 10;
}
app.c:
#include <stdio.h>
#include "teste.h"
int main(int argc, const char **argv) {
printf("func() retornou %d\n",func());
return 0;
}
To compile:
gcc -o static.o -c static.c
ar rcs static.a static.c
gcc -o app.o -c app.c
gcc -o teste app.o static.a