I have gone through all the solutions on StackOverflow as well as Ask Ubuntu.
I have a Go program:
package main
import "C"
//export Getint
func Getint() int {
return 2
}
func main() {}
and I have generated .so
file for the same with name t.so and header file
t.h`
Now I would like to use this function in my C program.
I have written the code but I don't know how to execute it.
#include <stdio.h>
#include <t.h>
int main()
{
int a;
a=Getint();
printf("number : %d",a);
return 0;
}
When I execute it with
gcc c.c t.so
it generates a.out
file
but at the time of running a.out
with ./a.out
it gives an error:
./a.out
Error while loading shared libraries: t.so: can not open shared object file: no such file or directory exists.
then I tried with:
gcc -c c.c -l t.so
So it generates c.o
file and it is not executable.
You should use the linker option -rpath
, which tells the linker to add information in the executable program where to find runtime libraries like your .so
file.
This can be done using the GCC option -Wl
which instructs the GCC frontend program to pass an option to the linker:
$ gcc c.c t.so -Wl,-rpath=$(pwd)
This will pass -rpath=$(pwd)
to the linker, and $(pwd)
causes the shell to call the pwd
command to return the current directory.
As long as you don't move the library the program should work.
You can use the environment variable LD_LIBRARY_PATH
too, but it's not recommended.