https://llvm.org/bugs/show_bug.cgi?id=24327
Bug ID: 24327
Summary: wrong inference for -Wtautological-compare
Product: clang
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
the following code
int a;
unsigned int b;
bool foo()
{
return (a + b) >= 0;
}
compiles with:
warning: comparison of unsigned expression >= 0 is always true
[-Wtautological-compare]
return (a + b) >= 0;
but, for example, a=-5 b=1, a+b= -4 < 0
i.e signed + unsigned = signed
and not unsigned.
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