Use union for the payload of struct Lisp_Vector.

This helps to avoid a few glitches dictated by C's aliasing rules.
* lisp.h (struct Lisp_Vector): Use union for next and
contents member.  Adjust comment.  Change related users.
* alloc.c (next_in_free_list, set_next_in_free_list): Remove.
Related users changed.
* buffer.c, bytecode.c, ccl.c, character.h, chartab.c, composite.c:
* composite.h, disptab.h, fns.c, fontset.c, indent.c, keyboard.c:
* lread.c, msdos.c, process.c, w32menu.c, window.c, xdisp.c:
* xfaces.c, xfont.c, xmenu.c: Related users changed.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 28b4da176ae..a2eb39e7196 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,18 @@
 2013-09-24  Dmitry Antipov  <dmantipov@yandex.ru>
 
+        Use union for the payload of struct Lisp_Vector.
+        This helps to avoid a few glitches dictated by C's aliasing rules.
+        * lisp.h (struct Lisp_Vector): Use union for next and
+        contents member.  Adjust comment.  Change related users.
+        * alloc.c (next_in_free_list, set_next_in_free_list): Remove.
+        Related users changed.
+        * buffer.c, bytecode.c, ccl.c, character.h, chartab.c, composite.c:
+        * composite.h, disptab.h, fns.c, fontset.c, indent.c, keyboard.c:
+        * lread.c, msdos.c, process.c, w32menu.c, window.c, xdisp.c:
+        * xfaces.c, xfont.c, xmenu.c: Related users changed.
+
+2013-09-24  Dmitry Antipov  <dmantipov@yandex.ru>
+
         Optimize glyph row clearing and copying routines.
         * dispextern.h (struct glyph_row): Change layout of struct
         glyph_row to help copy_row_except_pointers.  Adjust comment.