Linking library in codon build for shared library

[gyuro]

I'm working on a project where the main function calls a run function, which is linked to an exported codon library (librun.so). This codon library, in turn, is linked to a shared library named libtest.so.

However, I'm facing a challenge because the codon build doesn't have a feature that allows the user to include a dependent library when creating a shared library. This is causing inconvenience as I have to update the library path each time, especially since the library name changes with every run due to some reason.

Could you give me a solution to import the dependent library for the codon build?

Here's my code:

In main.cpp:

extern "C" void run();
int main() {
   run();
   return 0;
}

In run.codon:

LIBRARY = "libtest.so"
from C import LIBRARY.test(float, float) -> float

@export
def run():
    res = test(2.0, 3.0)

In libtest.so:

float test(float x, float y) {
   return x * y;
}

These are the commands that I used to build.

codon build --release --relocation-model=pic --lib -o librun.so run.codon g++ -o main main.cpp -L . -lrun

[arshajii]

Hi @gyuro -- you can pass custom flags to the C compiler/linker that Codon uses to generate the shared library via the -linker-flags argument of codon, e.g.

codon build ... -linker-flags '-ltest' ... run.codon

Does that work in your case?

[gyuro]

Yes, it appears to be functioning. However, should LIBRARY still be configured in the codon? Is it possible to import functions from the shared library without specifying LIBRARY?

[arshajii]

If you're linking the libtest.so library then you should be able to just use from C import without specifying the library explicitly:

from C import test(float, float) -> float

Does that work?

[gyuro]

Amazing, it functions perfectly. Appreciate your help