If I compile a program with -std=c99 and do a sizeof of a constant that is
larger then LONG_LONG_MAX but smaller then ULONG_LONG_MAX I get 16 instead of
8. For values larger then ULONG_LONG_MAX I get 8. I can reproduce this on x86
Linux and IA64 HP-UX (and probably other systems). Here is a test case that
should show the problem on any systems where LONG LONG is 8 bytes. Compiled
without -std=c99 all the prints will print '8', with '-std=c99' the middle two
prints will print out 16 instead of 8. Reproducable with ToT and going back to
at least 4.1.0.
#include <stdio.h>
main()
{
/* LONG_LONG_MAX */
printf("%ld\n", sizeof(9223372036854775807LL));
/* LONG_LONG_MAX + 1 */
printf("%ld\n", sizeof(9223372036854775808LL));
/* ULONG_LONG_MAX as a long long type */
printf("%ld\n", sizeof(18446744073709551615LL));
/* ULONG_LONG_MAX + 1 as a long long type */
printf("%ld\n", sizeof(18446744073709551616LL));
}
--
Summary: sizeof returns wrong size for large long long values
when using -std=c99
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sje at cup dot hp dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43633
