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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 <malat@debian.org> for
reporting this bug.
Author: Ben Pfaff <pfaffben@debian.org>
Bug-Debian: http://bugs.debian.org/742780
Forwarded: yes
---
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
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