[go-nuts] Debug Go program with GDB on macOS shows nothing

[changkun]

Debugging with GDB works fine on Linux, it is able to show everything with 
the breakpoint. However, nothing appears on macOS.

A simple Go program, say `main.go`:

    package main
    
    func main() {
    println("hello, world!")
    }


Then build with 

    go build -gcflags "-N -l" -o main main.go


Using GDB:

    $ gdb main
    GNU gdb (GDB) 8.2
    (...)
    Reading symbols from main...(no debugging symbols found)...done.
    Loading Go Runtime support.
    (gdb) source /usr/local/Cellar/go/1.11/libexec/src/runtime/runtime-gdb.
py
    Loading Go Runtime support.
    (gdb) info files
    Symbols from "/Users/changkun/Desktop/demo/main".
    Local exec file:
            `/Users/changkun/Desktop/demo/main', file type mach-o-x86-64.
            Entry point: 0x1049e20
            0x0000000001001000 - 0x000000000104dfcf is .text
            0x000000000104dfe0 - 0x0000000001077344 is __TEXT.__rodata
            (...)
    (gdb) b *0x1049e20
    Breakpoint 1 at 0x1049e20
    (gdb)


There is no `at` in the GDB outputs, the version of Go is `go version 
go1.11 darwin/amd64` and:

    $ ls -al /usr/local/bin | grep go
    lrwxr-xr-x    1 changkun  admin        24 Aug 25 16:37 go -> ../Cellar/
go/1.11/bin/go



======

Same process in linux environment:

    docker run -it --rm --name golang golang:1.11 bash

then entering container install `gdb`

    root@1326d3f1a957:/# gdb main
    GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
    (...)
    (gdb) info files
    Symbols from "/main".
    Local exec file:
            `/main', file type elf64-x86-64.
            Entry point: 0x44a2e0
            0x0000000000401000 - 0x000000000044ea8f is .text
            (...)
    (gdb) b *0x44a2e0
    Breakpoint 1 at 0x44a2e0: file 
/usr/local/go/src/runtime/rt0_linux_amd64.s, line 8.
    (gdb)


Linux is able to show with a breakpoint, `(gdb) b *0x44a2e0
    Breakpoint 1 at 0x44a2e0: file 
/usr/local/go/src/runtime/rt0_linux_amd64.s, line 8.`

What did I do wrong on macOS? How can I perform low-level debugging for Go 
programs on macOS with GDB?

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