The attached patch fixes C++-11 handling of "alignas(0)" which
should be ignored but currently generates an error message.  A
test case is included; the patch has been tested on S390x.  Since
it's a language issue it should be independent of the backend
used.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69089

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany