使用GDB进行Golang调试？

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 ?

2) 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.

Go does not work well with GDB and one of the known problems is the printing of values.

More details can be found here.

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}

The accepted answer is outdated.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