Port to C11 aligned_alloc, and fix some integer overflows.

* configure.ac (GMALLOC_OBJ): Initialize to empty if !system_malloc
and doug_lea_malloc.
(aligned_alloc): Test for existence if !GMALLOC_OBJ and not darwin.
(posix_memalign): Test for existence only if !GMALLOC_OBJ and
not darwin and !aligned_alloc.
* src/alloc.c (USE_ALIGNED_ALLOC): New symbol.
(USE_POSIX_MEMALIGN): Remove.  All uses replaced with USE_ALIGNED_ALLOC,
and use of posix_memalign replaced with aligned_alloc.
(aligned_alloc): New function, defined or declared as needed.
* src/conf_post.h (HAVE_POSIX_MEMALIGN) [DARWIN_OS]:
Don't undef; configure.ac now does this.
* src/gmalloc.c (aligned_alloc) [MSDOS]: New decl.
(calloc, aligned_alloc): Check for integer overflow.
(aligned_alloc): Rename from memalign.  All uses changed.
(memalign): New function, an alias for aligned_alloc.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/conf_post.h b/src/conf_post.h
index 786105864f2..2d967c0fefc 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -49,8 +49,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define malloc unexec_malloc
 #define realloc unexec_realloc
 #define free unexec_free
-/* Don't use posix_memalign because it is not compatible with unexmacosx.c.  */
-#undef HAVE_POSIX_MEMALIGN
 #endif
 /* The following solves the problem that Emacs hangs when evaluating
    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile