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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang++ creates symbol it cannot demangle."
href="https://bugs.llvm.org/show_bug.cgi?id=35646">35646</a>
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<th>Summary</th>
<td>Clang++ creates symbol it cannot demangle.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huangs@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following program, saved as "a.cc"
**** a.cc ****
#include <string>
std::string get_value() {
return "sparrow";
}
int main() {
static const std::string& weird = get_value();
return 0;
}
========
Build, get symbol for |weird| and demangle:
clang++ a.cc
llvm-nm a.out | grep weird # Output 1
llvm-nm a.out --demangle | grep weird # Output 2
Results:
**** Output 1 ****
00000000006010a0 b _ZGRZ4mainE5weird_
0000000000601098 b _ZGVZ4mainE5weird
0000000000601090 b _ZZ4mainE5weird
========
**** Output 2 ****
00000000006010a0 b _ZGRZ4mainE5weird_
0000000000601098 b guard variable for main::weird
0000000000601090 b main::weird
========
So "_ZGRZ4mainE5weird_" cannot be demangled (llvm-cxxfilt does not work
either). Interestingly, c++filt can demangle it as:
reference temporary #0 for main::weird
So it seems one of the following is broken:
(1) Mangled name generation producing an invalid value.
(2) Demangling not properly working (perhaps with extension).</pre>
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