https://llvm.org/bugs/show_bug.cgi?id=24035
Bug ID: 24035
Summary: false positive, -Wsign-compare, signed value obviously
can't be negative
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
Code:
unsigned int dostuff();
void f(int x) {
if (x >= 0 && x < dostuff()) {}
}
Output:
signcompare.c:3:19: warning: comparison of integers of different signs: 'int'
and 'unsigned int' [-Wsign-compare]
if (x >= 0 && x < dostuff()) {}
~ ^ ~~~~~~~~~
it is obvious there can't be a bug here so there should not be a warning.
This kind of false positive is indirectly a security problem. People routinely
hide these false positives using casts or changed variable types etc. and that
cause bugs and hides other real warnings.
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