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go-将两个具有相同功能名称的C库链接到CGO?

(go - Linking two C libraries with the same function name with CGO?)

发布于 2020-11-26 07:42:27

例如,我有两个具有相同函数名的C库:

hello1.c:

#include <stdio.h>

void hello() {
    printf("Hello from C hello1.c\n");
}

hello2.c:

#include <stdio.h>

void hello() {
    printf("Hello from C hello2.c\n");
}

如何将其链接到Go可执行二进制文件?静态或动态无关紧要。

我已经尝试过甚至将其静态链接到单独的Go插件中,但是它不起作用–只有来自两个Go插件的调用hello函数来自hello1.c

hello1.go Go插件:

package main

/*
#cgo LDFLAGS: -L${SRCDIR}/lib -lhello1

void hello();
*/
import "C"
import "fmt"

func Hello() {
    fmt.Println("Hello from Go plugin hello1.go")
    fmt.Println("Call C hello1.c")
    C.hello()
}

hello2.go Go插件:

package main

/*
#cgo LDFLAGS: -L${SRCDIR}/lib -lhello2

void hello();
*/
import "C"
import "fmt"

func Hello() {
    fmt.Println("Hello from Go plugin hello2.go")
    fmt.Println("Call C hello2.c")
    C.hello()
}

main.go可执行二进制文件:

package main

import (
    "fmt"
    "plugin"
)

func main() {
    p1, err := plugin.Open("hello1/hello1.so")
    if err != nil {
        panic(err)
    }
    fmt.Println("Load Go plugin hello1.so")

    p2, err := plugin.Open("hello2/hello2.so")
    if err != nil {
        panic(err)
    }
    fmt.Println("Load Go plugin hello2.so")

    h1, err := p1.Lookup("Hello")
    if err != nil {
        panic(err)
    }

    h2, err := p2.Lookup("Hello")
    if err != nil {
        panic(err)
    }

    fmt.Println("Call Go plugin hello1.go")
    h1.(func())()
    fmt.Println("\nCall Go plugin hello2.go")
    h2.(func())()
}

运行main可执行二进制文件后的输出

./main
Load Go plugin hello1.so
Load Go plugin hello2.so

Call Go plugin hello1.go
Hello from Go plugin hello1.go
Call C hello1.c
Hello from C hello1.c

Call Go plugin hello2.go
Hello from Go plugin hello2.go
Call C hello2.c
Hello from C hello1.c <=== here hello1.c, but I expected hello2.c

更新:

我已经完成了golang的问题以获得答案:https : //github.com/golang/go/issues/42854

Questioner
DsXack
Viewed
0
DsXack 2020-11-28 22:40:34

我在github问题https://github.com/golang/go/issues/42854中得到了我的问题的答案

When I compile C libraries I should use -fvisibility=hidden gcc flag.