Fix alignment portability problems

Do not assume that the natural alignment of Lisp objects is a
multiple of GCALIGNMENT.  This improves on the portability of the
recent fix for Bug#29040.
* lib-src/make-docfile.c (close_emacs_globals):
* src/buffer.c (buffer_defaults, buffer_local_symbols):
* src/lisp.h (DEFUN):
* src/thread.c (main_thread):
Use GCALIGNED, not alignas (GCALIGNMENT).
* src/alloc.c (COMMON_MULTIPLE):
Move back here from lisp.h, since it is no longer used elsewhere.
* src/lisp.h (GCALIGNMENT): No longer a macro, since we need not
worry about MSVC.  Omit no-longer-needed consistency check.
* src/thread.c (THREAD_ALIGNMENT): Remove.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/thread.c b/src/thread.c
index 7a670ba410b..03f5b31855e 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -26,9 +26,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include "coding.h"
 #include "syssignal.h"
 
-#define THREAD_ALIGNMENT COMMON_MULTIPLE (alignof (max_align_t), GCALIGNMENT)
-
-static struct thread_state alignas (THREAD_ALIGNMENT) main_thread;
+static struct thread_state GCALIGNED main_thread;
 
 struct thread_state *current_thread = &main_thread;