On Wed, 27 Mar 2013, Senthil Kumar Selvaraj wrote: > Hi, > > I was looking at why gcc.dg/c1x-align-3.c (test for errors, line 15) is > failing for the AVR target, and I found that the test expects _Alignas > with -__INT_MAX__ - 1 to fail with a "too large" error.
It expects either an error either about being too large, or about not being a power of 2. > Is it right to check against HOST_BITS_PER_INT, when the alignment A check against HOST_BITS_PER_INT would be because of code inside GCC that uses host "int" to store alignment values. Ideally there wouldn't be such code - ideally any alignment up to and including the size of the whole target address space could be used. (For example, alignments could always be represented internally as a base-2 log.) But given the existence of such code, such a check is needed. However, a size that is not a power of 2 (such as this one, minus a power of 2) should still be detected and get an error that this test accepts, whether or not that size is also too large for host int. So look at why you don't get the "requested alignment is not a power of 2" error for this code with a negative alignment. -- Joseph S. Myers jos...@codesourcery.com
