英文:
"unexpected R_X86_64_64 relocation for dynamic symbol" when using Cgo
问题
我正在尝试使用Cgo为一个C库创建绑定。我有一个使用Cgo导入该库并进行一些调用的包。它可以成功编译和安装。但是当我尝试从Go程序中使用该包时，在链接时出现错误“unexpected R_X86_64_64 relocation for dynamic symbol”。
有什么想法吗？
英文:
I am trying to create binding for a C library using Cgo. I have package which uses Cgo to import the library and make some calls to it. It compiles and installs fine. But when trying to use that package from a Go program, I get the the error "unexpected R_X86_64_64 relocation for dynamic symbol" when linking.
Any ideas?
答案1
得分: 1
它出现在6g编译器的汇编生成例程中：
case 256 + R_X86_64_64:
if(targ->dynimpname != nil && !targ->dynexport)
diag("对于动态符号%s，出现了意外的R_X86_64_64重定位",
targ->name);
r->type = D_ADDR;
return;
R_X86_64_64是库中的一种符号类型。有关amd64架构中重定位的更多信息，请参考此处的第70页。
您是否可能将386编译的库与amd64代码混合使用？
编译器应该报告导致问题的确切符号。您可以尝试链接一个包含其他符号的最小库，并尝试找到一个失败的最小示例吗？
您是否成功使用cgo与任何库一起使用？
英文:
It appears in the assembly generation routines in the 6g compiler:
case 256 + R_X86_64_64:
if(targ->dynimpname != nil && !targ->dynexport)
diag("unexpected R_X86_64_64 relocation for dynamic symbol %s",
targ->name);
r->type = D_ADDR;
return;
The R_X86_64_64 is a type of a symbol in the library. For more information about relocation in the amd64 architecture consult page ~70 here.
Is it possible that you mix 386 compiled library with amd64 code?
The compiler should report the exact symbol which caused the problem. Can you try linking with a minimal library containing other symbols, and try to locate a minimal example where it fails?
Did you manage to use cgo with any library at all?
答案2
得分: 0
我同意Elazar的观点，混合使用32位和64位代码似乎是可能的。
你尝试过gccgo吗？
英文:
I agree with Elazar that it seems plausible that mixing of 32-bit and 64-bit code is involved.
Have you tried gccgo?
答案3
得分: 0
运行得很好：
root@Ubuntu-1304-raring-64-minimal:/etc# uname -a
Linux Ubuntu-1304-raring-64-minimal 3.8.13.4 #2 SMP Mon Jul 8 23:59:05 CEST 2013 x86_64 x86_64 x86_64 GNU/Linux
按照以下顺序执行：
cd /usr/local
mkdir /var/go
apt-get install mercurial
hg clone https://code.google.com/p/go/
之后创建一个 /etc/profile.d/go.sh 文件，并将以下内容添加到其中，并使其可执行：
export GOPATH=/var/go
export GOROOT=/usr/local/go
export GOBIN=$GOPATH/bin
export PATH=$PATH:$GOBIN
export GOROOT_FINAL=/var/go
export GOHOSTARCH=amd64
export GOARCH=amd64
export CGO_ENABLED=1
然后重新启动你的shell。注意：source xxx 将无法正常工作 - 请注意！在新的shell中执行以下操作：
cd /usr/local/go/src
./make.bash
完成后，将所有内容从 /usr/local/go 复制到 /var/go - 或者可以通过符号链接的方式合并两个目录，根据你的喜好选择。之后，在上述go.sh脚本中注释掉GOROOT_FINAL，并再次重新启动你的shell。然后，你就可以使用最新的Go语言了！
root@Ubuntu-1304-raring-64-minimal:/usr/work/golang/go/src# go version
go version devel +35d5bae6aac8 Fri Oct 18 10:45:19 2013 +0400 linux/amd64
请注意：需要两次重新启动shell - 我自己通过艰难的方式发现的。
英文:
Works like a charm :
root@Ubuntu-1304-raring-64-minimal:/etc# uname -a
Linux Ubuntu-1304-raring-64-minimal 3.8.13.4 #2 SMP Mon Jul 8 23:59:05 CEST 2013 x86_64 x86_64 x86_64 GNU/Linux
do this sequence :
cd /usr/local
mkdir /var/go
apt-get install mercurial
hg clone https://code.google.com/p/go/
After that create a /etc/profile.d/go.sh with the follewing contents and make it executable:
export GOPATH=/var/go
export GOROOT=/usr/local/go
export GOBIN=$GOPATH/bin
export PATH=$PATH:$GOBIN
export GOROOT_FINAL=/var/go
export GOHOSTARCH=amd64
export GOARCH=amd64
export CGO_ENABLED=1
And then restart your shell. NO source xxx will be working properly - be warned! In a new shell do this :
cd /usr/local/go/src
./make.bash
do the thing, and then copy all the things from /usr/local/go to /var/go - or there's a way to merge both directories by symlink, whatever you prefer. After that comment GOROOT_FINAL in go.sh script above AND restart your shell again. And you're ok with latest working Go language!
root@Ubuntu-1304-raring-64-minimal:/usr/work/golang/go/src# go version
go version devel +35d5bae6aac8 Fri Oct 18 10:45:19 2013 +0400 linux/amd64
Note bene : Two shell restarts are required - found it myself in a hard way.
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