Article View: gnu.gcc.bug
Article #1493misleading "limited range" warning
From: Bruno Haible
Date: Tue, 29 Dec 1992 13:32
Date: Tue, 29 Dec 1992 13:32
22 lines
1285 bytes
1285 bytes
Compiling the following
=============================== warntest.c ==============================
int foo ()
{ if (0xFFFFFFFFULL & -1LL) return 4; else return 1; }
=========================================================================
using "gcc -V 2.3.3 -c -W warntest.c" produces the warning
warntest.c: In function `foo':
warntest.c:2: warning: comparison is always 1 due to limited range of data type
This is misleading: If the "comparison" ((0xFFFFFFFFULL & -1LL) != 0)
evaluates to 1 for a certain data type, then it evaluates to 1 for every
larger integer data type (in this case even for every integer data type).
I'm using gcc 2.3.3, configured i386-linux.
Btw, long long on i386 now work perfectly. Congratulations!
Bruno Haible
haible@ma2s2.mathematik.uni-karlsruhe.de
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Newsgroups: gnu.gcc.bug Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!ma2s2.mathematik.uni-karlsruhe.de!haible From: haible@ma2s2.mathematik.uni-karlsruhe.de (Bruno Haible) Subject: misleading "limited range" warning Message-ID: <9212291132.AA19062@ma2s2.mathematik.uni-karlsruhe.de> Sender: gnulists@ai.mit.edu Organization: GNUs Not Usenet Distribution: gnu Date: Tue, 29 Dec 1992 13:32:38 GMT Approved: bug-gcc@prep.ai.mit.edu Lines: 23