misleading "limited range" warning

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1 total messages Started by Bruno Haible Tue, 29 Dec 1992 13:32

#1493

Author: Bruno Haible
Date: Tue, 29 Dec 1992 13:32

22 lines
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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