Undefined symbol when linking dylib written in rust

Usage
1

Hi, i’m working on a side project trying to use rust to write a lib to be used on a turbo modules package from react native. I have written a very simple function in rust that multiply two numbers and return the result:

#[no_mangle]
pub extern "C" fn multiply_rs(x: f64, y: f64) -> f64 {
    x * y
}

In my cmakelists file i have included that lib using the corrosion-rs tool to include the lib and then link it to the native library written in c++. I’m able to compile the code but when i tried to call the function a have received the error “undefined symbol: multiply_rs(double, double)”. I created a header file to declare the function i am calling and imported it on my cpp file

rust-mmkv.h

extern double multiply_rs(double a, double b);

#include "react-native-mmkv-rs.h"
#include "rust-mmkv.h"

namespace mmkvrs {
	double multiply(double a, double b) {
		double x = multiply_rs(a, b);
		return x;
	}
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.4.1)
project(MmkvRs)

set (CMAKE_VERBOSE_MAKEFILE ON)
set (CMAKE_CXX_STANDARD 11)

include(FetchContent)

FetchContent_Declare(
    Corrosion
    GIT_REPOSITORY https://github.com/corrosion-rs/corrosion.git
    GIT_TAG v0.4 # Optionally specify a commit hash, version tag or branch here
)
FetchContent_MakeAvailable(Corrosion)

corrosion_import_crate(MANIFEST_PATH ../rust-mmkv/Cargo.toml NO_LINKER_OVERRIDE)

add_library(react-native-mmkv-rs            SHARED
            ../cpp/react-native-mmkv-rs.cpp
            cpp-adapter.cpp
)

target_link_libraries(react-native-mmkv-rs PUBLIC rust-mmkv)

# Specifies a path to native header files.
include_directories(
            ../cpp
)

I don’t have much knowledge about cmake so i don’t know what i am doing wrong here…
Any help is much appreciated.

2

Solved by updating the header file from extern double multiply_rs(double a, double b); to extern "C" double multiply_rs(double a, double b);