go1.14/go1.14.1 missing some debug information

[sanye]

Hello gophers,

  I have a problem when debugging with gdb using go1.14/1.14.1, set a breakpoint on entrypoint will not show line and file information, but go1.13.9 and older versions have, here is the detail

  demo.go

----------------

package main

func main() {
    println("hello world")
}

build

----------------

go build -gcflags "all=-N -l" demo.go

go1.13.9

-----------------

$ go version
go version go1.13.9 linux/amd64
$ go build -gcflags "all=-N -l" demo.go
$ gdb ./demo
...
(gdb) info files
Symbols from "/dev/shm/ex/demo".
Local exec file:
`/dev/shm/ex/demo', file type elf64-x86-64.
Entry point: 0x4542a0
...
(gdb) b *0x4542a0
Breakpoint 1 at 0x4542a0: file /dev/shm/ex/go/src/runtime/rt0_linux_amd64.s, line 8.

go1.14/go1.14.1

----------------

$ go version
go version go1.14.1 linux/amd64

$ go build -gcflags "all=-N -l" demo.go
$ gdb ./demo
...
(gdb) info files
Symbols from "/dev/shm/ex/demo".
Local exec file:
`/dev/shm/ex/demo', file type elf64-x86-64.
Entry point: 0x45cdd0
...
(gdb) b *0x45cdd0
Breakpoint 1 at 0x45cdd0

any help would be appreciated

[Ian Lance Taylor]

Odd. I can recreate this, but I don't know what is going on here.
Please open a bug report at https://golang.org/issue. Thanks.

Ian

[Than McIntosh]

Thanks for filing the issue (https://github.com/golang/go/issues/38192). I added some comments.

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