https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95156
Bug ID: 95156
Summary: -Wtautological-compare warns in C but not C++
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: simon.marchi at polymtl dot ca
Target Milestone: ---
Any reason why this code:
volatile unsigned short insn;
int main()
{
if ((insn & 0xffb0) == 0xe950) {
return 1;
} else {
return 0;
}
}
warns when compiled with gcc:
$ gcc-10 test.c -c -Wall
test.c: In function ‘main’:
test.c:5:23: warning: bitwise comparison always evaluates to false
[-Wtautological-compare]
5 | if ((insn & 0xffb0) == 0xe950) {
|
but not when compiled with g++:
$ g++-10 test.c -c -Wall
<nothing>
?
