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 for reporting this bug. Author: Ben Pfaff 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