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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - invalid DW_AT_linkage_name generated for cos<int>"
href="https://bugs.llvm.org/show_bug.cgi?id=43491">43491</a>
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<th>Summary</th>
<td>invalid DW_AT_linkage_name generated for cos<int>
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mail@milianw.de
</td>
</tr>
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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>Created <span class=""><a href="attachment.cgi?id=22597" name="attach_22597" title="source code to reproduce issue, compile with `clang++ -O2 -g -static`">attachment 22597</a> <a href="attachment.cgi?id=22597&action=edit" title="source code to reproduce issue, compile with `clang++ -O2 -g -static`">[details]</a></span>
source code to reproduce issue, compile with `clang++ -O2 -g -static`
take the attached code and compile it with `clang++ -O2 -g -static` then look
at the DWARF data e.g. with dwarfdump or similar. You'll notice this:
```
< 2><0x00001b6e> DW_TAG_subprogram
DW_AT_linkage_name
_ZSt3cosIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_
DW_AT_name cos<int>
DW_AT_decl_file 0x00000015
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/9.1.0/../../../../include/c++/9.1.0/cmath
DW_AT_decl_line 0x000000c4
DW_AT_type <0x000026b1>
DW_AT_external yes(1)
DW_AT_inline DW_INL_inlined
```
Now let's use the DW_AT_linkage_name with c++filt or cxxabi's demangle function
and nothing will happen:
```
c++filt
_ZSt3cosIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_
_ZSt3cosIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_
```
Apparently this isn't a valid mangled name? I don't have enough knowledge of
the format to say why it's not properly demangled, I can only report that it
doesn't work as expected...</pre>
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