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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [10.master regression] false positive warning -Wreturn-stack-address"
href="https://bugs.llvm.org/show_bug.cgi?id=44150">44150</a>
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<th>Summary</th>
<td>[10.master regression] false positive warning -Wreturn-stack-address
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kyrylo.bohdanenko@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>I have noticed this with clang master (llvm 10) (built from
3b901ce36755bf67c62d9ba5866ad9e0ab9f546d). The following snippet produces false
positive warning:
#include <vector>
std::vector<int>::const_iterator test(const std::vector<int>& data) {
std::vector iters{data.begin()};
return iters.front();
}
Compiler output:
prog.cc:5:10: warning: address of stack memory associated with local variable
'iters' returned [-Wreturn-stack-address]
return iters.front();
^~~~~
1 warning generated.
This is clearly incorrect, because function is supposed to return a (copy of)
iterator to the argument vector ref.
Earlier release versions of clang do not produce such warning.
P.S. This bug does not duplicate #21218, since the latter was reported much
earlier and this only affects current master.</pre>
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