英文:
Golang debug using GDB?
问题
我有两个关于GDB + golang的问题：
1）Go构建GCC标志
当我运行"go build"时，Go构建器使用哪些gcc标志来构建程序？构建值与go环境中设置的"GOGCCFLAGS"相同吗？
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
因为我没有看到任何添加代码符号的"-g"或"-g3"标志。如果有的话，如何编译符号表？
2）如何在GDB中打印一个值
我按照这里的教程GDB调试go教程，但似乎打印出来的值不是我设置的值。
顺便说一下，我注意到有一个关于它的帖子gdb调试go
然而，对我也不起作用。
英文:
I got 2 questions about GDB + golang?
1) Go build GCC flags
when I run "go build" , which gcc flags do the Go builder use to build a program? The build value is same as the "GOGCCFLAGS" set in the go envionment?
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
because I don't see any "-g" or "-g3" flags for adding code symbol. If yes, how could the symbol table be compiled ?
- How to print a value in GDB
I followed the tutorial here GDB debug go tutorial, but it seems the value is not what I set.
By the way, I noticed there is a post about it gdb debug go
However, doesn't work for me either.
答案1
得分: 15
Golang现在与GDB很好地配合使用。
这是一个示例的Golang应用程序gdbtest。
- gdbtest/
- main.go
以下是示例的main.go代码：
package main
import "fmt"
type MyStruct struct {
x string
i int
f float64
}
func main() {
x := "abc"
i := 3
fmt.Println(i)
fmt.Println(x)
ms := &MyStruct{
x: "cba",
i: 10,
f: 11.10335,
}
fmt.Println(ms)
}
将其保存为main.go。然后使用以下gcflag标志进行编译。
go build -gcflags "-N"
使用新构建的Golang应用程序打开gdb。
gdb gdbtest
# 或者
gdb <PROJECT_NAME>
现在你完全控制gdb了。例如，使用br <linenumber>命令添加断点，然后使用run命令执行应用程序。
(gdb) br 22
Breakpoint 1 at 0x2311: file /go/src/github.com/cevaris/gdbtest/main.go, line 22.
(gdb) run
Starting program: /go/src/github.com/cevaris/gdbtest/gdbtest
3
abc
Breakpoint 1, main.main () at /go/src/github.com/cevaris/gdbtest/main.go:22
22 fmt.Println(ms)
(gdb)
现在你可以打印所有的局部变量。
(gdb) info locals
i = 3
ms = 0x20819e020
x = 0xdb1d0 "abc"
甚至可以访问指针。
(gdb) p ms
$1 = (struct main.MyStruct *) 0x20819e020
(gdb) p *ms
$2 = {x = 0xdb870 "cba", i = 10, f = 11.103350000000001}
以上是你要翻译的内容。
英文:
Golang now works well with GDB
Here is an example golang app gdbtest
- gdbtest/
- main.go
Take the following example main.go
package main
import "fmt"
type MyStruct struct {
x string
i int
f float64
}
func main() {
x := "abc"
i := 3
fmt.Println(i)
fmt.Println(x)
ms := &MyStruct{
x: "cba",
i: 10,
f: 11.10335,
}
fmt.Println(ms)
}
Save that to main.go. Then compile with the follwing gcflag flag.
go build -gcflags "-N"
Open gdb with your newly built golang app
gdb gdbtest
# or
gdb <PROJECT_NAME>
You now have full control of gdb. For example, add a breakpoint with br <linenumber> command, then execute the app with run
(gdb) br 22
Breakpoint 1 at 0x2311: file /go/src/github.com/cevaris/gdbtest/main.go, line 22.
(gdb) run
Starting program: /go/src/github.com/cevaris/gdbtest/gdbtest
3
abc
Breakpoint 1, main.main () at /go/src/github.com/cevaris/gdbtest/main.go:22
22 fmt.Println(ms)
(gdb)
Now you can print all the local variables
(gdb) info locals
i = 3
ms = 0x20819e020
x = 0xdb1d0 "abc"
Even get access to the pointers
(gdb) p ms
$1 = (struct main.MyStruct *) 0x20819e020
(gdb) p *ms
$2 = {x = 0xdb870 "cba", i = 10, f = 11.103350000000001}
答案2
得分: 6
接受的答案已过时。
如果使用标志-gcflags=all="-N -l"进行构建，Golang目前可以与GDB一起使用（包括本地变量），如官方文档所述。
英文:
The accepted answer is outdated.
Golang currently works with GDB (including locals) if you build with the flags -gcflags=all="-N -l", as described on the official documentation
答案3
得分: 5
Go与GDB不兼容，其中一个已知的问题是值的打印。
更多详细信息可以在这里找到。
英文:
Go does not work well with GDB and one of the known problems is the printing of values.
More details can be found here.
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