How to load a shared library

[Angel-del-dev]

Vlang version : V 0.4.7 fc31b44

I have the shared libraries in 'lib/'.

The library I'd like to load is 'functions.so' and it contains only one function named 'fib'.

I haven't been able to use this library with the information in the docs

The Shared library was compiled with V too.
v -shared -o lib/functions export/functions.v

// export/functions.v
module export

@[export: 'fib']
pub fn fib(n int) int {
	if n <= 2 { return 1 }
	else { return fib(n-1) + fib(n-2) }
}

Loading the library:

module main

import os
import dl.loader

fn main() {
	abs_path := os.abs_path('lib/functions.so')

	mut dl_loader := loader.get_or_create_dynamic_lib_loader(
		key: 'Lib',
		paths: [abs_path]
	) or {
		panic(err)
	}
	print(dl_loader)
}

And compiling it with: v main.v && ./main

It outputs the following:

&loader.DynamicLibLoader{
    key: 'Lib'
    flags: 1
    paths: ['/home/myuser/Desktop/dev/project/v/dllgenerator/lib/functions.so']
    handle: 0
    sym_map: {}
}

The sym_map is empty and I believe its because V doesn't find the shared library.

I have tried using both relative and absolute paths.
The file exists, and i can read it with V

I also tried changing the module name in functions.v to see if it was giving some incompatibility with @[export: 'fib'].

File tree:

• export
  • functions.v
• lib
  • functions.so
• main.v

[ikolesnikes]

Is seems that get_or_create_dynamic_lib_loader doesn't load any symbols automatically. Probably, this is by design.
If you do
sym := dl_loader.get_sym('fib')!
then sym_map gets updated.

Looking at the loader.v, sym_map is being used as a cache for symbols resolved by get_sym.