构建Go与Gtk+的C接口

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英文:

Building Go with C interface to Gtk+

问题

我正在尝试构建一个使用外部C代码作为Gtk+接口的Go程序。

这是我得到的基本Go代码(ui.h.go):

package main

//#cgo pkg-config: gtk+-3.0
//#include "ui.h"
import "C"

func CInit() {
    C.Init(nil, 0)
}

func CMain() {
    C.Main()
}

func CShowWindow() {
    C.ShowWindow()
}

func main() {
    CInit()
    CShowWindow()
    CMain()
}

C代码从Vala编译成一个目标文件(ui.o)和一个头文件(ui.h):

#ifndef __UI_H__
#define __UI_H__

#include <glib.h>
#include <stdlib.h>
#include <string.h>

G_BEGIN_DECLS

void ShowWindow(void);
void Init(gchar** args, int args_length1);
void Main(void);

G_END_DECLS

#endif

当我尝试运行go build ui.h.go时,我得到以下错误:

# command-line-arguments
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_Init':
./ui.h.go:37: undefined reference to `Init'
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_Main':
./ui.h.go:46: undefined reference to `Main'
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_ShowWindow':
./ui.h.go:55: undefined reference to `ShowWindow'
collect2: error: ld returned 1 exit status

这是合理的,因为我没有提供我的目标文件。但是,如果我在ui.h.go的cgo头部指定它,就像这样...

//#cgo LDFLAGS: ui.o
//#cgo pkg-config: gtk+-3.0
//#include "ui.h"
import "C"

我会得到多重定义错误,好像它被链接了两次。

# command-line-arguments
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
ui.o:(.bss+0x0): multiple definition of `window'
/tmp/go-link-461834384/000000.o:/home/oleg/Документы/Projects/rasp/ui.h.go:38: first defined here
ui.o: In function `ShowWindow':
ui.c:(.text+0x0): multiple definition of `ShowWindow'
/tmp/go-link-461834384/000000.o:(.text+0x25): first defined here
ui.o: In function `Init':
ui.c:(.text+0x29): multiple definition of `Init'
/tmp/go-link-461834384/000000.o:(.text+0x4e): first defined here
ui.o: In function `Main':
ui.c:(.text+0x116): multiple definition of `Main'
/tmp/go-link-461834384/000000.o:(.text+0x13b): first defined here
collect2: error: ld returned 1 exit status

如何正确地将我的ui.o文件链接到Go程序中?
谢谢。

英文:

I'm trying to build a Go programm which uses external C code as an interface for Gtk+.

That's the basic Go code I've got (ui.h.go):

package main

//#cgo pkg-config: gtk+-3.0
//#include &quot;ui.h&quot;
import &quot;C&quot;

func CInit() {
    C.Init(nil, 0)
}

func CMain() {
    C.Main()
}

func CShowWindow() {
    C.ShowWindow()
}

func main() {
    CInit()
    CShowWindow()
    CMain()
}

C code is compiled from vala into an object file (ui.o) and a header file (ui.h):

#ifndef __UI_H__
#define __UI_H__

#include &lt;glib.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;

G_BEGIN_DECLS

void ShowWindow (void);
void Init (gchar** args, int args_length1);
void Main (void);

G_END_DECLS

#endif

When I try go build ui.h.go I get:

# command-line-arguments
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_Init&#39;:
./ui.h.go:37: undefined reference to `Init&#39;
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_Main&#39;:
./ui.h.go:46: undefined reference to `Main&#39;
/tmp/go-build916459533/command-line-arguments/_obj/ui.h.cgo2.o: In function `_cgo_80fc53cbf347_Cfunc_ShowWindow&#39;:
./ui.h.go:55: undefined reference to `ShowWindow&#39;
collect2: error: ld returned 1 exit status

Which is logical, I haven't provided my object file. But if I specify it in cgo header of ui.h.go like that...

//#cgo LDFLAGS: ui.o
//#cgo pkg-config: gtk+-3.0
//#include &quot;ui.h&quot;
import &quot;C&quot;

I get multiple definition error, as if it's being linked twice.

# command-line-arguments
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
ui.o:(.bss+0x0): multiple definition of `window&#39;
/tmp/go-link-461834384/000000.o:/home/oleg/Документы/Projects/rasp/ui.h.go:38: first defined here
ui.o: In function `ShowWindow&#39;:
ui.c:(.text+0x0): multiple definition of `ShowWindow&#39;
/tmp/go-link-461834384/000000.o:(.text+0x25): first defined here
ui.o: In function `Init&#39;:
ui.c:(.text+0x29): multiple definition of `Init&#39;
/tmp/go-link-461834384/000000.o:(.text+0x4e): first defined here
ui.o: In function `Main&#39;:
ui.c:(.text+0x116): multiple definition of `Main&#39;
/tmp/go-link-461834384/000000.o:(.text+0x13b): first defined here
collect2: error: ld returned 1 exit status

How do I link my ui.o file to the Go program correctly?
Thank you.

答案1

得分: 2

嗯,我发现cgo与静态库链接得很好。所以我决定将我的ui.o归档为libui.a,并使用#cgo LDFLAGS: -L. -lui进行链接,结果是正确的。

英文:

Well, I figured out that cgo does link well with static libraries. So I decided to archive my ui.o into libui.a and link it using #cgo LDFLAGS: -L. -lui and it worked correctly.

huangapple
  • 本文由 发表于 2015年10月25日 20:35:46
  • 转载请务必保留本文链接:https://go.coder-hub.com/33329744.html
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