unsigned long long l = 9223372036854775808LL; should get an error with -std=c99 -pedantic-errors, but instead gets a warning:
t.c:1:24: warning: integer constant is so large that it is unsigned C99 does not allow decimal constants without "U" suffix to get an unsigned type. I think the preprocessor should pedwarn in this case (for C99, not C90), to catch the use of such constants in #if conditions as well. The preprocessor already pedwarns for a value large enough to be outside the range of uintmax_t (which is used to set the preprocessor's internal precision), so I believe this case of a constant inside the range of uintmax_t but outside that of intmax_t, in decimal without "U" suffix, is the only current case of this bug. See <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38934#c15> for some historical discussion (but it doesn't appear types wider than intmax_t can ever appear this way after all). -- Summary: constants too large for intmax_t need pedwarns Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: preprocessor AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jsm28 at gcc dot gnu dot org OtherBugsDependingO 16989 nThis: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39559
