[Bug go/81421] Circular runtime.s-gox -> runtime.lo dependency dropped -> objcopy: 'runtime.s-gox.tmp': No such file

["ian at airs dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81421

--- Comment #8 from Ian Lance Taylor <ian at airs dot com> ---
On my system I see this:

> sed '/^package /q' < ~/gcc/gcc-7-branch/libgo/go/runtime/mksizeclasses.go | grep '^// +build ' | cat
// +build ignore

That is, the command displays `// +build ignore`.  The fact that it displays
nothing on your system is the root of the problem here.

You seem to be running GNU/Linux.  What versions of sed and grep are on your
PATH?  The sed and grep commands look simple enough to me.  I can't think of
any reason why they would fail.  What does the sed command print if you run it
alone?