[Bug go/69357] libgo refers to _end in a non-weak way

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69357

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, might be an interesting interaction between --no-add-needed and
--as-needed as well (--as-needed is used by default by us).  But that would
point to a linker issue.

No testcase - this was observed when compiling docker 1.8.3 with GCC 5 and
gccgo
on s390x with -static-libgo (plus --as-needed, --no-add-needed is the default
AFAIK).

But it might be "easy" to create an artificial testcase that fails the same
way.

Anyway, the _end reference is surely weird (given the shared libgo will provide
it itself).