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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang-cl miscompiles insertion of struct value into std::map"
href="http://llvm.org/bugs/show_bug.cgi?id=21330">21330</a>
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<th>Summary</th>
<td>clang-cl miscompiles insertion of struct value into std::map
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hans@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>david.majnemer@gmail.com, llvmbugs@cs.uiuc.edu, rnk@google.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Example derived from a Chromium unit test:
#include <map>
#include <stdio.h>
#include <string>
struct CrashKey {
const char *name;
size_t val;
};
std::map<std::string, CrashKey> map;
int main() {
const CrashKey keys[] = { { "foo", 42 }, { "bar", 7 } };
for (int i = 0; i < sizeof keys / sizeof keys[0] ; ++i)
map.insert(std::make_pair(keys[i].name, keys[i]));
for (auto i : map)
printf("key: %s, %d\n", i.second.name, i.second.val);
return 0;
}
Compiled with clang-cl /Ox, this prints
key: bar, 0
key: foo, 0
Compiled without optimization, or with MSVC, it prints:
key: bar, 7
key: foo, 42
I think this regressed sometime last night.</pre>
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