Does golang support mixed compilation?

Golang supports hybrid programming. Golang is a statically typed, compiled language that supports mixed programming of existing system programming languages ​​such as C and C. This means that C or C code can be used in Golang programs. , and in turn, code using Golang in C or C programs.

Operating system for this tutorial: Windows 10 system, Go1.20.1 version, Dell G3 computer.

Golang is a statically typed, compiled language, but it supports hybrid programming with existing system programming languages ​​such as C and C. This means You can use C or C code in a Golang program, and conversely, use Golang code in a C or C program. This ability is called "mixing."

One of the benefits of mixing is: when you need to use an existing old code base in a Golang project, you can avoid rewriting all the code or migrating it all to the Golang project, thereby saving time and cost. At the same time, powerful existing C or C open source libraries are also available in addition to Golang and its add-on libraries.

There are two main steps to implement hybrid compilation:

1. Compile C or C source code into an object file or static library file

Use Golang's cgo tool can convert pointers to C or C source files into a form that Golang can understand. The compiler can then use these files to call the corresponding C or C functions in Golang, thus achieving hybrid programming.

2. Calling C or C functions in Golang

Before including C in Go code, there must be a cgo annotation, which tells the go tool chain that this file uses cgo, and need to build a C linker command to link the C function library. When calling a C or C function, just use a method similar to the golang function.

The following is a simple example of mixed programming using Golang and C:

package main
/*
#include <stdio.h>
void call_c() {
    printf("Calling C code!\n");
}
*/
import "C"
func main() {
    C.call_c()
}

In the above example, we imported the stdio header file through Cgo and defined a file called `call_c` C function. Then, just call this function in the main function.

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