bootstrap: illumos go binary uses wrong interpreter

[jclulow]

I was attempting to cross-build a Go bootstrap archive on my Linux workstation, for use on an illumos/amd64 system:

jclulow@leftstation /var/tmp/goboot/src
$ GOROOT_BOOTSTRAP=/opt/go/1.17 GOOS=illumos GOARCH=amd64 ./bootstrap.bash
#### Copying to ../../go-illumos-amd64-bootstrap

#### Cleaning ../../go-illumos-amd64-bootstrap

#### Building ../../go-illumos-amd64-bootstrap

Building Go cmd/dist using /opt/go/1.17. (go1.17 linux/amd64)
Building Go toolchain1 using /opt/go/1.17.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for host, linux/amd64.
Building packages and commands for target, illumos/amd64.
----
Bootstrap toolchain for illumos/amd64 installed in /var/tmp/go-illumos-amd64-bootstrap.
Building tbz.
-rw-r--r-- 1 jclulow nfsusers 135561186 Aug 17 15:26 /var/tmp/go-illumos-amd64-bootstrap.tbz

This built successfully, and I transferred it to an illumos machine to run it. Unfortunately it appears to have built with the wrong ELF interpreter:

$ ./bin/go version
go: Cannot find /lib64/ld-linux-x86-64.so.2
Killed

The binary is otherwise as we would expect for illumos; e.g.,

$ elfdump bin/go 2>/dev/null | grep NEEDED
      [10]  NEEDED            0x14                libsendfile.so
      [11]  NEEDED            0x23                libsocket.so
      [12]  NEEDED            0x3c                libc.so
$ nm bin/go | grep illumos
[1524]  |             4603968|                   5|FUNC |GLOB |0    |1      |_rt0_amd64_illumos

It seems like this may be related to the fix for #45034. I tried running bootstrap.sh with GO_LDSO set:

GO_LDSO=/lib/64/ld.so.1 GOROOT_BOOTSTRAP=/opt/go/1.17 GOOS=illumos GOARCH=amd64 ./bootstrap.bash

This produced a binary which works on the target system:

$ ./go-illumos-amd64-bootstrap/bin/go version
go version devel go1.18-a2a9a7b513 Tue Aug 17 21:34:32 2021 +0000 illumos/amd64

[ianlancetaylor]

Probably a dup of #47760.

[mknyszek]

I think so, too. @jclulow can you please try at tip, which should now include https://golang.org/cl/343010?

[mknyszek]

Closing for now, if that doesn't help, I'll reopen.

[jclulow]

Thanks @mknyszek it does indeed work now!