Hello guys,
I’m trying the C interop to link a lib C to my Crystal code.
To simplify the comprehension of the work, I have created a miniature representation of the issue.
I have this C code
#ifndef __NEURATRON_H__
#define __NEURATRON_H__
struct Foo {
int* array;
int size;
};
struct Foo* init_foo();
int* give_42();
#endif // __NEURATRON_H__
#include "neuratron.h"
#include <stdlib.h>
struct Foo* init_foo() {
struct Foo* foo = malloc(sizeof(struct Foo));
foo->array = malloc(sizeof(int) * 5);
foo->array[0] = 0;
foo->array[1] = 5;
foo->array[2] = 2;
foo->array[3] = 1;
foo->array[4] = 9;
foo->size = 5;
return foo;
}
int* give_42() {
int* foo = malloc(sizeof(int));
(*foo) = 40;
return foo;
}
And the following Crystal code
@[Link("neuratron")]
lib LibLibrary
struct Foo
array : Pointer(Int32)
size : Int32
end
fun give_me_42 = give_42() : Int32*
fun foo = init_foo() : Pointer(Foo)
end
class Giver42
@value : Int32
@value2 : LibLibrary::Foo
def initialize
@value = LibLibrary.give_me_42.value
@value2 = LibLibrary.foo.value
end
def give
@value
end
def give2
@value2
end
end
pp LibLibrary.give_me_42.value
pp Giver42.new.give
foo = Giver42.new.give2
pp foo.value
This give me the error
undefined reference to `init_foo’
If you have any idea on how to fix it, I would love it 