[LLVMbugs] [Bug 22861] New: "return { value }" returns uninitialized std::initializer_list
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Mon Mar 9 17:55:32 PDT 2015
https:llvm.org/bugs/show_bug.cgi?id=22861
Bug ID: 22861
Summary: "return { value }" returns uninitialized
std::initializer_list
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangbugs at nondot.org
Reporter: nlewycky at google.com
CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
Classification: Unclassified
Testcase:
#include <initializer_list>
#include <cstdio>
std::initializer_list<int> MakeList() {
return { 7 };
}
void helper(std::initializer_list<int> list) {
for (auto i : list) {
printf("%d\n", i);
}
}
int main() {
helper(MakeList());
}
This prints "32767" on my system, and has an msan error indicating that the
list allocated in MakeList was uninitialized memory, later read in the use of
'i' at the printf callsite.
GCC prints "7" which is what I'd expect. It's an x-value shouldn't go away
until the ';' at the end of helper(), right?
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