[Bug c++/69089] C++11: alignas(0) causes an error

[vogt at linux dot vnet.ibm.com]

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

--- Comment #3 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
A tested patch with a test case is available here:
https://gcc.gnu.org/ml/gcc-patches/2015-12/msg02228.html