gcc/c-family/ChangeLog:

2016-04-29  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	PR/69089
	* c-common.c (handle_aligned_attribute): Allow 0 as an argument to the
	"aligned" attribute.

gcc/testsuite/ChangeLog:

2016-04-29  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	PR/69089
	* g++.dg/cpp0x/alignas6.C: New test.

From-SVN: r235629