From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 9 Dec 2018 06:59:50 +0000 (-0800)
Subject: * src/alloc.c (VECTOR_ELTS_MAX): Make sure it’s signed.
X-Git-Tag: emacs-27.0.90~4018
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=7515a1d493f8f0f6f009b50c99cc5e27824bd6b3;p=emacs.git

* src/alloc.c (VECTOR_ELTS_MAX): Make sure it’s signed.
---

diff --git a/src/alloc.c b/src/alloc.c
index d34b34f27d8..201e3f0b13f 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3340,9 +3340,10 @@ sweep_vectors (void)
    can be used in an integer constant expression.  */
 
 #define VECTOR_ELTS_MAX \
-  min (((min (PTRDIFF_MAX, SIZE_MAX) - header_size - large_vector_offset) \
-	/ word_size), \
-       MOST_POSITIVE_FIXNUM)
+  ((ptrdiff_t) \
+   min (((min (PTRDIFF_MAX, SIZE_MAX) - header_size - large_vector_offset) \
+	 / word_size), \
+	MOST_POSITIVE_FIXNUM))
 
 /* Value is a pointer to a newly allocated Lisp_Vector structure
    with room for LEN Lisp_Objects.  LEN must be positive and