autoconf-all-32bit_off_t_fix.patch

file_548962.txt (text/plain), 1.11 KB, created by Adam Feldman on 2015-05-09 06:34:14 UTC

 Description: Fix undefined behavior for 32-bit off_t.
 autoconf (2.69-6) unstable; urgency=low
 .
   * lib/autoconf/specific.m4: Use ((off_t) 1 << 31) << 31 in place of
     (off_t) 1 << 62 to avoid undefined behavior when off_t is 32-bit.
     Closes: #742780.  Thanks to Mathieu Malaterre <[e-mail]> for
     reporting this bug.
Author: Ben Pfaff <[e-mail]>
Bug-Debian: http://bugs.debian.org/742780

---
Bug: #742780.
Bug-Debian: http://bugs.debian.org/742780
Last-Update: 2014-03-27

--- autoconf-2.69.orig/lib/autoconf/specific.m4
+++ autoconf-2.69/lib/autoconf/specific.m4
@@ -92,7 +92,7 @@ m4_define([_AC_SYS_LARGEFILE_TEST_INCLUD
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-@%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+@%:@define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1]];[]dnl