https://bugs.llvm.org/show_bug.cgi?id=37113
Bug ID: 37113
Summary: No -Wtautological-compare warning issued
Product: clang
Version: 6.0
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangbugs at nondot.org
Reporter: riyaz at synopsys.com
CC: llvm-bugs at lists.llvm.org
For the following simple test case, clang fails to issue a
-Wtautological-compare warning. gcc 6.2 issues this warning.
If there was no pointer deference (and there was a self compare on a simple
int), then clang would issue the warning as expected. The pointed memory is not
volatile and clang -O1 optimizes away the two comparisons that would always
evaluate to false. So it is reasonable to expect that it should warn about them
as well.
struct Foo {
int a;
};
int cmp(const Foo* x, const Foo* y);
int cmp(const Foo* x, const Foo* y)
{
if (x->a < x->a) {
return -1;
} else if (y->a > y->a) {
return 1;
}
return 0;
}
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