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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-cl and libc++ produce PDBs that confuse windbg / cdb"
href="https://bugs.llvm.org/show_bug.cgi?id=41451">41451</a>
</td>
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<tr>
<th>Summary</th>
<td>clang-cl and libc++ produce PDBs that confuse windbg / cdb
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>MachO
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>C:\src\chrome\src>type test.cc
#include <string>
int main() {
std::string s = "hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii";
std::string s2 = "hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii";
return s.size() + s2.size();
}
<span class="quote">>"third_party\llvm-build\Release+Asserts\bin\clang-cl.exe" test.cc /I "buildtools\third_party\libc++\trunk\include" -D_LIBCPP_NO_AUTO_LINK -D_LIBCPP_ABI_UNSTABLE libc++.dll.lib /Zi</span >
<span class="quote">>cdb -c "bp `test.cc:6`; g; dv; q" test.exe</span >
[...]
Breakpoint 0 hit
s = class
std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>
>
s2 = <unknown base type 80000013>
Note missing output for s2. Works fine without libc++:
<span class="quote">>"third_party\llvm-build\Release+Asserts\bin\clang-cl.exe" test.cc /Zi</span >
<span class="quote">>cdb -c "bp `test.cc:6`; g; dv; q" test.exe</span >
Breakpoint 0 hit
s = "hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii"
s2 = "hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii"
I have a local natvis thing that makes cdb print "hiiiiiii..." with libc++, but
this bug happens without that too. This is about the "<unknown base type>"
error.
Seems to happen with both link.exe and lld-link.</pre>
</div>
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