From: "PRC" <panruochen@gmail.com>
To: "gcc-help" <gcc-help@gcc.gnu.org>
Subject: how gcc thinks `char' as signed char or unsigned char ?
Date: Wed, 05 Mar 2008 09:20:00 -0000 [thread overview]
Message-ID: <200803051719569448630@gmail.com> (raw)
---------------------------------
int main()
{
char a = -7;
if( a < -9 )
printf("a");
else
printf("b");
}
---------------------------------
sde-gcc -c a2.c
c:/a2.c: In function `main':
c:/a2.c:6: warning: comparison is always false due to limited range of data type
It may be the reason for this warning that gcc thinks `char' as 'unsigned char' by default.
Can I change the default configuration by modifying some configuration file?
Or this feature can't be changed after gcc has been built?
next reply other threads:[~2008-03-05 9:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-05 9:20 PRC [this message]
2008-03-05 9:58 ` Andrew Haley
2008-03-05 13:08 ` John Love-Jensen
2008-03-05 13:32 ` Tom St Denis
2008-03-05 14:11 ` John Love-Jensen
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