This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug c++/41561] warning on a large hex literal in C++ 0x mode
- From: "msebor at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Oct 2009 16:08:46 -0000
- Subject: [Bug c++/41561] warning on a large hex literal in C++ 0x mode
- References: <bug-41561-1186@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from msebor at gmail dot com 2009-10-04 16:08 -------
I'm not positive which stage issues the warning but the preprocessor does not
warn on large integer literals in preprocessor directives involving integer
arithmetic (e.g., #if 0x123456789abcd > LONG_MAX).
Strictly speaking, the warning isn't incorrect (it's true that 0x123456789abcd
is too large for the long type in ILP32), but it's also not relevant or useful
in any way. The section of the C++ 0x draft that I pointed to specifies that
the type of a hex integer literal with no suffix is the first standard integer
type from the following list in which the value of the literal can be
represented: int, unsigned int, long, unsigned long, long long, unsigned long
long. These are the same rules as in C which the C99 compiler interprets
without issuing a warning.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41561