[Bug go/68562] morestack misaligns stack on x86_64

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68562

--- Comment #7 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Ian Lance Taylor from comment #6)
> Your build is passing the option "-B/usr/local/x86_64-pc-linux-gnu/lib/";
> why?

I have no idea.

> You have an old version of the Go libraries installed under that directory. 
> Either remove the -B option or remove the old version of the Go libraries.

There is no /usr/local/x86_64-pc-linux-gnu directory on my system:

markus@x4 tmp % ll /usr/local/
total 8.0K
drwxr-xr-x 1 root   root     96 Nov 11 18:16 .
drwxr-xr-x 1 markus markus  168 Jan 18 08:37 ..
drwxr-xr-x 1 root   root   1.6K Feb  9 20:30 bin
drwxr-xr-x 1 root   root     40 Oct 25 19:53 etc
drwxr-xr-x 1 root   root    134 Apr  3  2015 include
-rw-r--r-- 1 root   root      0 Nov 18  2010 .keep
lrwxrwxrwx 1 root   root      5 Aug 27 13:30 lib -> lib64
drwxr-xr-x 1 root   root   4.0K Feb  9 20:30 lib64
drwxr-xr-x 1 root   root     48 Nov 18 16:49 libexec
lrwxrwxrwx 1 root   root      9 Aug 27 13:30 man -> share/man
drwxr-xr-x 1 root   root     50 Jan 21 10:46 sbin
drwxr-xr-x 1 root   root    500 Nov 21 10:46 share
drwxr-xr-x 1 root   root     10 Nov 18  2010 src
markus@x4 tmp %