How to correctly compile a Golang project using a package containing C code

Question content

I started writing a project in Golang and immediately ran into a problem. I need to connect to hardware from my code and I have a driver and a vendor provided Golang wrapper. The description of the wrapper connection says that the code needs to be placed in the project's src directory (I don't use such a directory, but I put the files by package name in the directory ./internal/fptr10 and in my main.go it was imported successfully ). I saw the method in this package in the IDE GoLand, but when I try to compile the project (I call the first function that should create the driver instance, called New()) - I get the error: fptr10. New() is not defined. There are two header files written in C in the wrapper directory and I know there is something wrong with them but I don't understand how to compile it correctly.

The entire project, as well as the library itself, can be found at https://github.com/Natrix31/KKTWatcher P.S.: I work under Windows

I tried compiling the project from the IDE and from the command line using go build and go install But the result is the same. The program fails to compile and gives the error: New() undefined

Correct answer

For this case you can put the c code into the go module and just Make sure you have a c compiler installed on your platform and reference it using the preamble comments.

main.go

/*
    #include <stdio.h>
    #include <math.h>
    #include "calc.h"
*/
import "c"

func main() {
    fmt.println(c.add(1, 2))
}

calc.c：

#include "calc.h"

int add(int a, int b) {
    return a + b;
}

calc.h：

int add(int a, int b);

go enables cgo by default, so just build it:

go build -o main.out .

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