http://llvm.org/bugs/show_bug.cgi?id=16733
Bug ID: 16733
Summary: Infinite loopo segfaults with optimisation level 1 and
above
Product: clang
Version: 3.1
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
If the following code is compiled with optimisation level 1, 2 or 3, it
segfaults. With optimsation level 0 it hangs forever as it is supposed to.
ex.cpp:
-------
#include<iostream>
void test() {
for(std::size_t n = 1; n < 4 ;++n )
n >>=1;
}
int main() {
test();
}
Bash:
-----
$ clang++ -O1 ex.cpp -o program
$ ./program
Segmentation fault: 11
$ clang++ --version
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix
Note that the function call is essential. This code:
#include<iostream>
int main() {
for(std::size_t n = 1; n < 4 ;++n )
n >>=1;
}
works.
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