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* Re: c++/168: Spurious warning in 2.95.2
@ 2002-10-22 14:56 Wolfgang Bangerth
0 siblings, 0 replies; 2+ messages in thread
From: Wolfgang Bangerth @ 2002-10-22 14:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/168; it has been noted by GNATS.
From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
To: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>,
<martin@loewis.home.cs.tu-berlin.de>, <tmwg-gcc@inxservices.com>
Cc:
Subject: Re: c++/168: Spurious warning in 2.95.2
Date: Tue, 22 Oct 2002 16:48:33 -0500 (CDT)
This is equally well a C report as a C++ report, since the problem appears
with both languages. The questionably code is
----------------------------------
int main () {
unsigned char uc;
unsigned short int usi;
unsigned int ui;
if (uc + usi >= ui);
}
----------------------------------
and the report is that this issues an error
t.i:5: warning: comparison between signed and unsigned
As Jason pointed out, this is due to the fact that the left hand side is
converted to an integer. I have no opinion about the validity or the
warning, people should use casts to avoid this. I just wanted to share the
reduced code.
This may be something for value range propagation, since then it would be
clear that the left hand side must be positive.
Regards
Wolfgang
-------------------------------------------------------------------------
Wolfgang Bangerth email: bangerth@ticam.utexas.edu
www: http://www.ticam.utexas.edu/~bangerth
^ permalink raw reply [flat|nested] 2+ messages in thread
* c++/168: Spurious warning in 2.95.2
@ 2002-11-20 18:45 Wolfgang Bangerth
0 siblings, 0 replies; 2+ messages in thread
From: Wolfgang Bangerth @ 2002-11-20 18:45 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/168; it has been noted by GNATS.
From: Wolfgang Bangerth <bangerth@apex68.ticam.utexas.edu>
To: gcc-gnats@gcc.gnu.org
Cc:
Subject: c++/168: Spurious warning in 2.95.2
Date: Thu, 14 Nov 2002 14:23:51 -0600
Re-confirmed with 3.3 CVS from 2002-11-10 and 3.2.1 pre from the same date.
^ permalink raw reply [flat|nested] 2+ messages in thread
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