https://llvm.org/bugs/show_bug.cgi?id=23624
Bug ID: 23624
Summary: -fsanitize=signed-integer-overflow breaks under
optimization
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
$ cat tmp/ubsan-overflow/a.cc
int one();
int main() {
int x = one(); // 1
int y = x - 0; // 1
return x - y;
}
$ cat tmp/ubsan-overflow/b.cc
int one() { return 1; }
$ ./bin/clang++ -fsanitize=signed-integer-overflow -O1 tmp/ubsan-overflow/*.cc
&& ./a.out
tmp/ubsan-overflow/a.cc:6:12: runtime error: signed integer overflow: 1 - 0
cannot be represented in type 'int'
Seriously?
I will investigate this issue, reporting here to track progress and share the
link.
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