https://llvm.org/bugs/show_bug.cgi?id=24238
Bug ID: 24238
Summary: False Positive of -Wtautological-overlap-compare on
Expressions in Return Statement
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Clang does not warn on the expression "x > 6 && x < 2" in the return statement.
If this expression is in the if conditional, it warns.
$: cat s.c
int g(int x) {
return x > 6 && x < 2;
}
int f(int x) {
if (x > 6 && x < 2) {
return 1;
}
return 0;
}
$:
$: clang-trunk -Wtautological-overlap-compare -c s.c
s.c:5:13: warning: overlapping comparisons always evaluate to false
[-Wtautological-overlap-compare]
if (x > 6 && x < 2) {
~~~~~~^~~~~~~~
1 warning generated.
$:
$: gcc-trunk -c -Wlogical-op s.c
s.c: In function ‘g’:
s.c:2:16: warning: logical ‘and’ of mutually exclusive tests is always false
[-Wlogical-op]
return x > 6 && x < 2;
^
s.c: In function ‘f’:
s.c:5:13: warning: logical ‘and’ of mutually exclusive tests is always false
[-Wlogical-op]
if (x > 6 && x < 2) {
^
$:
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