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.
I looked at the code responsible for generating the error (c-common.c, check_user_alignment) and found that it checks if the number of bits in the user provided alignment is more than HOST_BITS_PER_INT - BITS_PER_UNIT_LOG. For AVR, integer size is 16 bits, and therefore __INT_MAX__ is 2^15 - 1. HOST_BITS_PER_INT, however, is 32 bits, and hence the error is not triggered. Is it right to check against HOST_BITS_PER_INT, when the alignment attribute only applies to the target? If the check is indeed correct, should the test be modified to handle targets whose __INT__MAX__ is less than 2^HOST_BITS_PER_INT - 1 ? Regards Senthil
