Avoid undefined behavior in signed left shift.

This ports to GCC 4.9.0 with -fsanitize=undefined.
* alloc.c (bool_vector_fill, SETMARKBIT, UNSETMARKBIT):
* data.c (Fash):
* regex.c (extract_number):
* lisp.h (make_number, XINT):
Do not shift a 1 bit left into a sign bit.
* alloc.c (struct cons_block, struct float_block): Use unsigned,
not int, for gcmarkbits.  All uses changed.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 9d4fd2d6d37..90223d6d103 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2014-04-28  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Avoid undefined behavior in signed left shift.
+        This ports to GCC 4.9.0 with -fsanitize=undefined.
+        * alloc.c (bool_vector_fill, SETMARKBIT, UNSETMARKBIT):
+        * data.c (Fash):
+        * regex.c (extract_number):
+        * lisp.h (make_number, XINT):
+        Do not shift a 1 bit left into a sign bit.
+        * alloc.c (struct cons_block, struct float_block): Use unsigned,
+        not int, for gcmarkbits.  All uses changed.
+
 2014-04-25  Eli Zaretskii  <eliz@gnu.org>
 
         * search.c (Fnewline_cache_check): Don't try to count newlines