Thanks a lot, but I tried to pass timestamp by
"-X=runtime.buildtimestamp=xxxx" to linker, it fails with the same message.
I guess the timestamp makes the dependence packages always STALE, maybe I
have to check logic of command "go list".
在 2017年12月16日星期六 UTC+8上午5:11:00，Ian Lance Taylor写道：
>
> On Fri, Dec 15, 2017 at 3:08 AM, Ally Dale <vip...@gmail.com
> <javascript:>> wrote:
> > Hi all,
> > I just need a function to report the timestamp when my app compiled.
> >
> > func main() {
> >
> >
> > unix := runtime.BuildTimestamp()
> >
> >
> > t := time.Unix(unix, 0)
> >
> >
> > println("hello world")
> >
> >
> > println("buildtimestamp:", unix)
> >
> >
> > println("buildtime :", t.String())
> >
> >
> > // Output:
> >
> >
> > // hello world
> >
> >
> > // buildtimestamp: 1513329454
> >
> >
> > // buildtime : 2017-12-15 17:17:34 +0800 CST
> >
> >
> > }
> >
> >
> >
> > [runtime.BuildTimestamp()](
> https://github.com/vipally/go/blob/ally_build_time/src/runtime/symtab.go#L399)
>
>
> > use a variable defined in
> > [runtime.firstmoduledata.buildtimestamp](
> https://github.com/vipally/go/blob/ally_build_time/src/runtime/symtab.go#L372)
>
>
> > which will be written by
> > [cmd/link](
> https://github.com/vipally/go/blob/ally_build_time/src/cmd/link/internal/ld/symtab.go#L562)
>
>
> >
> > My trouble is, if cmd/link use time.Now().Unix() to get unix timestamp,
> it
> > will make a new dependence of time for cmd/link.
> > And this dependence will cause a STALE error when go_bootstrap building.
> > go tool dist: unexpected stale targets reported by
> > E:\go\pkg\tool\windows_amd64\go_bootstrap list -gcflags="" -ldflags=""
> > for [cmd/asm cmd/cgo cmd/compile cmd/link runtime/internal/sys]:
> > STALE cmd/asm: stale dependency: runtime/internal/atomic
> > STALE cmd/cgo: stale dependency: runtime/internal/atomic
> > STALE cmd/compile: stale dependency: runtime/internal/atomic
> > STALE cmd/link: stale dependency: runtime/internal/atomic
> > STALE runtime/internal/sys: build ID mismatch
> >
> >
> > So, my question is, if I cannot use time.Now().Unix() or runtime.now()
> to
> > get unix timestamp in cmd/link. How can I get unix timestamp in
> > linker(cmd/link)?
>
> Use something like -ldflags=-X=`VAR=date`. The -X option is
> documented at https://golang.org/cmd/link.
>
> Ian
>
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