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* c-decl.c (shadow_tag_warned, grokdeclarator): Handle _Alignas specifiers. (build_null_declspecs): Initialize align_log and alignas_p fields. (declspecs_add_alignas): New. * c-parser.c (c_token_starts_declspecs): Handle RID_ALIGNAS. (c_parser_declspecs): Handle _Alignas specifiers. (c_parser_alignas_specifier): New. (c_parser_alignof_expression): Diagnose alignof use for non-C1X. Diagnose _Alignof (expression). * c-tree.h (struct c_declspecs): Add align_log and alignas_p fields. (declspecs_add_alignas): Declare. * ginclude/stddef.h (max_align_t): Define for C1X and C++11. * ginclude/stdalign.h: New. * Makefile.in (USER_H): Add stdalign.h. c-family: * c-common.c (c_common_reswords): Add _Alignas and _Alignof. (c_sizeof_or_alignof_type): Diagnose alignof applied to a function type. (check_user_alignment): New. Split out of handle_aligned_attribute. Disallow integer constants with noninteger types. Conditionally allow zero. (handle_aligned_attribute): Use check_user_alignment. * c-common.h (RID_ALIGNAS, check_user_alignment): New. testsuite: * g++.dg/cpp0x/alignof3.C, gcc.dg/c1x-align-1.c, gcc.dg/c1x-align-2.c, gcc.dg/c1x-align-3.c, gcc.dg/c1x-align-4.c, gcc.dg/c90-align-1.c, gcc.dg/c99-align-1.c: New tests. * gcc.dg/gnu89-const-expr-1.c, gcc.dg/gnu90-const-expr-1.c, gcc.dg/gnu99-const-expr-1.c, gcc.dg/gnu99-static-1.c: Update expected diagnostics. From-SVN: r181048
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